A
Abalone jingle:  See Pododesmus macroschismaAbarenicola pacifica
Abietinaria amphora:  See Abietinaria inconstans
Abietinaria costata:  See Abietinaria inconstans
Abietinaria inconstans
Acanthephyra curtirostris
Acanthina spirata
Acanthodoris nanaimoensis
Acantholithodes hispidus
Achelia latifrons
Acila castrensis
Acmaea alveus:  See Lottia alveus
Acmaea asmi:  See Lottia asmi
Acmaea digitalis:  See Lottia digitalis
Acmaea fenestrata:  See Tectura fenestrata
Acmaea mitra
Acmea persona:  See Tectura persona
Acmaea scutum:  See Tectura scutum
Actiniaria (Order)--Key
Acorn barnacle:  See Balanus glandula
Acorn worms:  See Phylum Hemichordata key
Adula californiensis
Aeolidacea (Suborder)--Key
Aeolidea papillosa:  See Aeolidia papillosa
Aeolidia farinacea:  See Aeolidia papillosa
Aeolidia papillosa
Aeolis opalescens: see Hermissenda opalescens
Aequorea aequorea:  See Aequorea victoria
Aequorea flava:  See Aequorea victoria
Aequorea forskalea:  See Aequorea victoria
Aequorea victoria
Aggregating anemone:  See Anthopleura elegantissima
Aggregating jelly:  See Eutonina indicans
Aggregating sea cucumber:  See Pseudocnus curatus
Aglaophenia sp.
Agriodesma saxicola: see Entodesma navicula
Aiptasiomorpha lucieae: See Diadumene lineata
Alabaster nudibranch: SeeDirona albolineata
Alaska abalone:  See Haliotis kamtschatkana
Alaska falsejingle:  See Pododesmus macroschisma
Alaska pink shrimp:  See Pandalus eous
Alaska spoonworm:  see Echiurus echiurus subspecies alaskanus
Alaskan gaper:  See Tresus capax
Alaskan hermit crab:  See Pagurus ochotensis
Alcyonaria (Subclass)--Key
Alcyonidium gelatinosum
Alcyonidium pedunculatum
Alcyonidium polyoum: See Alcyonidium gelatinosum
Alcyonium gelatinosum: See Alcyonidium gelatinosum
Alectrion fossatus:  See Nassarius fossatus
Algamorda newcombiana:  See Littorina subrotundata
Algamorda subrotundata:  See Littorina subrotundata
Alia casciana: See Astyris gausapata
Alia gausapata: See Astyris gausapata
Alia tuberosa
Alitta brandti:  See Nereis brandti
Alpheidae (Family)--Key
Alvinellidae (Family): See Paralvinella species such as P. sulfincola or P. palmiformis
Amaroucium californicum:  See Aplidium californicum
Amaroucium solidum:  See Aplidium solidum
American bloodworm: See Glycera americana
Ammothea verenae
Amphipoda (Order)--Key
Amphiodia barabarae:  See Amphiodia urtica
Amphiodia urtica
Amphiporus angulatus:  See Amphiporus bimaculatus
Amphiporus bimaculatus
Amphissa columbiana
Amphissa cymata: See Amphissa versicolor
Amphissa versicolor
Amphissa versicolor var cymata: See Amphissa versicolor
Amphissa versicolor var incisa: See Amphissa versicolor
Amphissa versicolor var lineata: See Amphissa versicolor
Amphissa versicolor versicolor: See Amphissa versicolor
Amycla tuberosa: See Alia tuberosa
Anaspidea (Order)
Anemones:  See Order Actiniaria
Angled hydromedusa:  See Gonionemus vertens
Anisodoris lentiginosa:  See Peltodoris lentiginosa
Anisodoris nobilis: see Peltodoris nobilis
Annelid worms: See Phylum Annelida
Anomura (Infraorder)--Key
Antedon perplexa:  See Florometra serratissima
Antedon serratissima:  See Florometra serratissima
Anthopleura artemisia
Anthopleura elegantissima
Anthopleura sola (not in key)
Anthopleura xanthogrammica
Anthozoa (Class)--Key
Antisabia cranioides:  See Hipponix cranioides
Aphrodita imbricata:  See Harmothoe imbricata
Aphrodita japonica
Aphroditidae (Family)--Key
Aplidium californicum
Aplidium solidum
Apostichopus californicus
Apple anemone:  See Stomphia didemon
Arachnida (Class)
Archidoris montereyensis
Archidoris odhneri: See Doris odhneri
Arctonoe fragilis
Arctonoe pulchra
Arctonoe vittata
Arenicolid pea crab:  See Pinnixa eburna
Arenicolidae (Family)--Key
Argis ochotensis
Armed hermit:  See Pagurus armatus
Armina californica
Arminacea (Suborder)--Key
Armored ball sponge:  See Geodia mesotriaena
Armored sea cucumber:  See Psolus chitonoides
Arrow worms: See Phylum Chaetognatha
Arthropoda (Phylum)
Ascidia paratropa
Ascidiacea (Class)--Key 
Asterias forreri: See Stylasterias forreri
Asterias koehleri:  See Orthasterias koehleri
Asterias (Urasterias) forcipulata: See Stylasterias forreri
Asterina miniata:  See Patiria miniata
Asteroidea (Class)--Key
Astyris gausapata
Astyris tuberosa: See Alia tuberosa
Aurelia aurita:  See Aurelia labiata
Aurelia labiata
Austrodoris odhneri:  See Doris odhneri
Axinola subobsoleta: See Glycymeris septentrionalis

B
Baby's ear:  See Velutina prolongata
Baetic dwarf olive: see Callianax biplicata
Baetic olive: see Callianax biplicata
Baetic olive snail: see Callianax biplicata
Balanophyllia elegans
Balanomorpha (Suborder)--Key
Balanus cariosus:  See Semibalanus cariosus
Balanus crenatus
Balanus glandula
Balanus nubilus
Balanus rostratus
Baltic macoma: See Macoma balthica
Bamboo worms:  See Family Maldanidae
Banded scale worm:  See Arctonoe vittata
Banded Tegula:  See Tegula eiseni
Banded turban snail:  See Tegula eiseni
Banner sea-nymph:  See Nereis vexillosa
Barentsia robusta
Barnacle-eating nudibranch: See Onchidoris bilamellata
Barnacle-eating Onchidoris: See Onchidoris bilamellata
Barnacles
Baseodiscus princeps
Basket cockle: See Clinocardium nuttallii
Basket shell:  See Nassarius fossatus
Bat star commensal worm:  See Ophiodromus pugettensis
Batillaria alterima:  See Batillaria attramentaria
Batillaria attramentaria
Batillaria cumingi:  See Batillaria attramentaria
Batillaria zonalis:  See Batillaria attramentaria
Bay ghost shrimp:  See Neotrypaea californiensis
Bay mussel:  See Mytilus trossulus
Beach hoppers (Amphipod family Talitridae)
Bell medusa:  See Polyorchis penicillatus
Bell-shaped jellyfish:  See Polyorchis penicillatus
Bentheogennema burkenroadi
Bent-nosed clam:  See Macoma nasuta
Benthoctopus leioderma: See Muusoctopus leioderma
Bernhardus armatus:  See Pagurus armatus
Bernhardus hirsutiusculus:  See Pagurus hirsutiusculus
Beroe cucumis:  See Hormiphora cucumis
Berthella californica: See Berthella chacei
Berthella chacei
Betaeus harrimani
Bishop's cap limpet:  See Acmaea mitra
Bittersweet shell: See Glycymeris septentrionalis
Bittium eschrichtii
Bivalvia (Class)--Key
Black-clawed crab Lophopanopeus bellus bellus
Black limpet:  See Lottia asmi
Black tegula:  See Chlorostoma funebralis
Black top shell:  See Chlorostoma funebralis
Black star: See Stylasterias forreri
Black turban snail:  See Chlorostoma funebralis
Blackeyed hermit:  See Pagurus armatus
Blister shell:  See Pododesmus macroschisma
Bladder clam:  See Mytilimeria nuttalli
Blood star: see Henricia leviuscula
Blood worms: See Polychaete family Glyceridae
Blue mussel:  See Mytilus trossulus
Bobbit worm:  See Eunice valens
Bodega clam:  See Tellina bodegensis
Bodega tellin:  See Tellina bodegensis
Bolinopsis alata:  See Bolinopsis infundibulum
Bolinopsis infundibulum
Bolinopsis microptera:  See Bolinopsis infundibulum
Bolinopsis septentrionalis:  See Bolinopsis infundibulum
Boltenia echinata
Boltenia villosa
Bopyroides hippolytes
Boring sponge:  See Cliona californiana
Bottle clam:  See Mytilimeria nuttalli
Bowl limpet:  See Lottia alveus
Box crab:  See Lopholithodes foraminatus
Brown box crab:  See Lopholithodes foraminatus
Brachiopoda (Phylum)--Key
Brachyura (Infraorder)--Key
Branched Obelia:  See Obelia dichotoma
Bristly crab:  See Telmessus cheiragonus
Bristly tunicate:  See Boltenia villosa
Brittle stars:  See Class Ophiuroidea
Broad-base sea squirt:  See Cnemidocarpa finmarkiensis
Broad-disk star:  See Patiria miniata
Broad six-rayed star:  See Leptasterias aequalis
Brooding transparent tunicate:  See Corella inflata
Brown buckshot barnacle: See Chthamalus dalli
Brown olive: see Callianax biplicata
Brown-streak stiliger:  See Stiliger fuscovittatus
Brown tegula:  See Chlorostoma brunnea
Brown top snail:  See Chlorostoma brunnea
Brown tunicate:  See Styela gibbsii
Brown turban snail:  See Chlorostoma brunnea
Bryozoa (Phylum)--Key
Bubble snail:  See Haminoea vesicula
Buccinidae (Family)--Key
Bucchinum thermophilum
Bugula californica
Buried Urticina:  See Urticina coriacea
Burkenroad blunt-tail shrimp:  See Bentheogennema burkenroadi
Burrow pea crab:  See Scleroplax granulata, Pinnixa tubicola
Burrowing brittle star:  See Amphiodia urtica
Butter clam:  See Saxidomus gigantea
Button shell: See Glycymeris septentrionalis
 

C
Cadilina luteomarginata
Calcareous tubeworm:  See Serpula vermicularis
California armina:  See Armina californica
California beach flea:  See Megalorchestia californiana
California beach hopper:  See Megalorchestia californiana
California berthella:  See Berthella chacei
California bittersweet shell: See Glycymeris septentrionalis
California bryozoan:  See Bugula californica
California club-ray:  See Corynactis californica
California datemussel:  See Adula californiensis
California green shrimp: See note in Hippolyte clarki
California oyster: See Ostrea lurida
California pea-pod borer:  See Adula californiensis
California piddock:  See Parapholas californica
California sand flea:  See Megalorchestia californiana
California sea cucumber:  See Apostichopus californicus
California sea pork:  See Aplidium californicum
Callianassa californiensis:  See Neotrypaea californiensis
Callianassidae (Family)--Key
Callianax baetica
Callianax biplicata
Calliostoma annulatum
Calliostoma ligatum
Calliostoma variegatum
Callopora horrida
Calyptraea fastigiata
Calyptraeidae (Family)--Key
Camp nutclam: See Acila castrensis
Cancellate hairysnail:  See Trichotropis cancellata
Cancer antennarius:  See Romaleon antennarium
Cancer gracilis:  See Metacarcinus gracilis
Cancer magister:  See Metacarcinus magister
Cancer oregonensis:  See Glebocarcinus oregonensis
Cancer productus
Cancridae (Family)--Key
Candy-stripe shrimp:  See Lebbeus grandimanus
Capitellida (Order)
Caprella angusta
Caprella augusta:  See Caprella angusta
Caprella kennerlyi
Caprella uniforma:  See Caprella angusta
Caprellidea (Suborder)--Key
Capulidae (Family)--Key
Carcinus maenas
Cardiidae (Family)--Key
Caridea (Infraorder)--Key
Cat's eye:  See Pleurobrachia bachei
Cauloramphus spiniferum
Cephalaspidea (Order)--Key
Cephalopoda (Class)--Key
Ceratostoma foliata:  See Ceratostoma foliatum
Ceratostoma foliatum
Cerebratulus herculeus var latus
Ceriantharia (Tubedwelling anemones):  See Pachycerianthus fimbriatus
Ceriantipatharia (Subclass)
Cerithidiidae (Family)--Key
Chaetognatha (Phylum)-Key
Chalk-lined Dirona: SeeDirona albolineata
Chamidae (Family)--Key
Channeled basket whelk:  See Nassarius fossatus
Channeled dog whelk:  See Nassarius fossatus
Channeled dogwinkle:  See Nucella canaliculata
Channeled nassa:  See Nassarius fossatus
Channeled purple:  See Nucella canaliculata
Checkered hairysnail:  See Trichotropis cancellata
Cheilonereis cyclurus
Cheilostomata (Order of Bryozoans)--Key
Chelyosoma columbianum
Chelysoma productum
Chevron ribon worm:  See Amphiporus bimaculatus
Childress' benthopelagic opossum shrimp:  See Gnathophausia childressi
Chinese hat limpet:  See See Acmaea mitra
Chinese hat snail:  See Calyptraea fastigiata
Chink shell:  See Lacuna variegata
Chionoecetes bairdi
Chionoecetes opilio (south of Alaska):  See Chionoecetes bairdi
Chlamys gigantea:  See Crassodoma gigantea
Chlamys hastata
Chlamys rubida
Chlorostoma brunnea
Chlorostoma funebralis
Chocolate limpet:  See Tectura fenestrata
Chordata (Phylum)
Chorilia longipes
Christmas anemone:  See Urticina crassicornis
Chrysaora fuscescens
Chrysaora gilberti:  See Chrysaora fuscescens
Chrysaora helvola:  See Chrysaora fuscescens
Chrysaora melanaster:  See also Chrysaora fuscescens
Chthamalus dalli
Ciliated scaleworm: See Gattyana ciliata
Circeis spirillum
Cirratulida (Order)
Cirratulidae (Family)--Key
Cirripedia (Class)--Key
Cladodactyla miniata:  See Cucumaria miniata
Clams and mussels:  See Class Bivalvia
Clam crab:  See Fabia subquadrata
Clam worm:  See Nereis vexillosa
Clavelina huntsmani
Clibinarius turgidus:  See Paguristes turgidus
Clinging jellyfish:  See Gonionemus vertens
Clinocardium nuttallii
Cliona californiana
Cliona celata var californiana:  See Cliona californiana
Closed moon snail: See Euspira pallida
Clown nudibranch:  See Triopha catalinae
Clown shrimp:  See Lebbeus grandimanus
Clymenella torquata
Clytia gregaria (medusa)
Cnemidocarpa finmarkiensis
Cnemidocarpa joannae:  See Cnemidocarpa finmarkiensis
Cnesterium scissurata:  See Yoldia seminuda
Cnidaria (Phylum)
Coarse sea fir:  See Abietinaria inconstans
Coastal spinyhead:  See Metacrangon munita
Cobbler crab:  See Chionoecetes bairdi
Cockerell's nudibranch:  See Limacea cockerelli
Colorful six-rayed star:  See Leptasterias aequalis
Collarenemertes bimaculata:  See Amphiporus bimaculatus
Collisella alveus:  See Lottia alveus
Collisella asmi:  See Lottia asmi
Collisella digitalis:  See Lottia digitalis
Columbella dalli: See Astyris gausapata
Columbella gausapata: See Astyris gausapata
Columbella tuberosa: See Alia tuberosa
Columbellidae (Family)--Key
Columbian amphissa:  See Amphissa columbiana
Columbia sand anemone:  See Urticina columbiana
Colus griseus
Comb jelly:  See Pleurobrachia bachei, Bolinopsis infundibulum, Hormiphora cucumis
Commensal scaleworm:  See  Arctonoe fragilis
Common coastal shrimp:  See Heptacarpus sitchensis
Common edible crab:  See Metacarcinus magister
Common grey sea slug:  See Aeolidia papillosa
Common jellyfish:  See Aurelia aurita
Common Pacific littleneck:  See Leukoma staminea
Common piddock:  See Penitella penita
Common rock crab:  See Romaleon antennarius
Common rock louse:  See Ligia pallasii, Ligia occidentalis
Common sand dollar:  See Dendraster excentricus
Common two-spined crangon:  See Neocrangon communis
Concave isopod:  See Idotea resecata
Corallimorpharia (Order)
Corallina setacea:  See Plumularia setacea
Corals:  See Order Scleractinia
Corella inflata
Coronula diadema
Corrugated clam:  See Humilaria kennerlyi
Corrugated worm: See Glycera americana
Corynactis californica
Crabs:  See Infraorder Brachyura for families of true crabs or Infraorder Anomura for families of other crablike species
Crago munita:  See Metacrangon munita
Crago alaskensis:  See Crangon alaskensis
Crangon alaskensis
Crangon alba
Crangon communis:  See Neocrangon communis
Crangon munita:  See Metacrangon munita
Crangonidae (Family)--Key
Cranopsis cucullata
Crassodoma gigantea
Crassostrea gigantea: See Magallana gigas
Crassostrea gigas: See Magallana gigas
Crassostrea laperousii: See Magallana gigas
Crassostrea posjetica: See Magallana gigas
Crassostrea talienwhanensis: See Magallana gigas
Creeping pedal sea cucumber:  See Psolus chitonoides
Crenate barnacle:  See Balanus crenatus
Crepidula adunca
Crepidula perforans
Cribrella laeviuscula var. crassa:  See Henricia pumila
Cribrinopsis fernaldi
Crimson anemone:  See Cribrinopsis fernaldi
Crimson doris:  See Rostanga pulchra
Crinoidea (Class)
Crisia occidentalis
Crisscross yoldia:  See Yoldia seminuda
Cross jellyfish:  See Mitrocoma cellularia
Crossaster papposus
Crucigera zygophora
Crustacea (Subphylum)
Crusty red anemone:  See Urticina columbiana
Cryptochiton stelleri
Cryptolithodes sitchensis
Cryptolithodes typicus
Cryptophyrs concharum:  See Fabia subquadrata
Ctenophora (Phylum)--Key
Ctenostomata (Order)--Key
Cucumaria albida:  See Cucumaria miniata
Cucumaria curata:  See Pseudocnus curatus
Cucumaria japonica:  See Cucumaria miniata
Cucumaria lubrica:  See also Pseudocnus curatus
Cucumaria miniata
Cucumaria pallida
Cucumaria piperata
Cultellidae (Family)--Key
Cup-and-saucer snail:  See Calyptraea fastigiata
Curly terebellid:  See Thelepus crispus
Cut-tailed isopod:  See Idotea resecata
Cyanea capillata
Cyclostomata (Order of Bryozoans)--Key
Cydippida (Order)
Cydonium muelleri:  See Geodia mesotriaena
Cynthia gibbsii:  See Styela gibbsii
 

D
Dahlia anemone:  See Urticina crassicornis
Daisy brittle star:  See Ophiopholus aculeata
Dall's dendronotid: See Dendronotus dalli
Dana's blade shrimp:  See Spirontocaris lamellicornis
Dana's bladed shrimp:  See Spirontocaris lamellicornis
Dark mahogany clam:  See Nuttallia obscurata
Dawson's sun star:  See Solaster dawsoni
Decapoda (Order)
Decorator crab:  See Oregonia gracilis, Chorilia longipes
Decorator hydroid:  See Plumularia setacea
Deep sea prawn:  See Pandalus eous
Delicate plume hydroid:  See Plumularia setacea
Delicate six-rayed star:  See Leptasterias aequalis
Delicate staghorn bryozoan: See Heteropora alaskensis
Dendraster excentricus
Dendrobranchiata (Suborder)--Key
Dendrochiton flectens
Dendronotacea (Suborder)--Key
Dendronotus albopunctatus
Dendronotus albus
Dendronotus dalli
Dendronotus elegans: See Dendronotus dalli
Dendronotus diversicolor
Dendronotus frondosus
Dendronotus giganteus:  See Dendronotus iris
Dendronotus iris
Dermasterias imbricata
Dermaturus hispidus:  See Acantholithodes hispidus
Diadumene lineata
Diadumene lucieae: See Diadumene lineata
Diaulula odonoghuei
Diaulula sandiegensis (See also Diaulula odonoghuei)
Diamphiodia urtica:  See Amphiodia urtica
Diaphorodoris lirulatocauda
Diodora aspera
Dioeciostrea hispaniola: See Magallana gigas
Diomedes tritonia:  See Tritonia diomedea
Dirona albolineata
Dirona aurantia: See Dirona pellucida
Dirona pellucida
Discodoris heathi: See Geitodoris heathi
Discodoris sandiegensis See Diaulula sandiegensis
Discorsopagurus schmitti
Disporella separata
Distaplia occidentalis
Distaplia smithi
Discurria insessa
Divaricate nutclam: See Acila castrensis
Dock shrimp:  See Pandalus danae
Dodecaceria concharum
Doridacea (Suborder)--Key
Doris echinata: See Diaulula odonoghuei
Doris odhneri
Doris sandiegensis: See Diaulula sandiegensis
Dosidicus eschrichti:  See Dosidicus gigas
Dosidicus gigas
Dosidicus steenstrupi:  See Dosidicus gigas
Dove shells:  See Family Columbellidae Key
Dovesnail: See Astyris gausapata
Dunce cap limpet:  See Acmaea mitra
Dungeness crab:  See Metacarcinus magister
Duvaucelia gilberti: See Tritonia diomedea
Dwarf mottled Henricia:  See Henricia pumila

E
Eastern softshell clam:  See Mya arenaria
Eccentric sand dollar:  See Dendraster excentricus
Echinodermata (Phylum)
Echinoidea (Class)--Key
Echiura (Phylum)--Key
Echiurus echiurus subspecies alaskanus
Ectoprocta (Phylum)
Edible mussel:  See Mytilus trossulus
Eelgrass isopod:  See Pentidotea resecata
Eelgrass limpet:  See Lottia alveus
Egg yolk jellyfish:  See Phacellophora camtschatica
Eighteen-scaled worm: See Halosydna brevisetosa
Elassochirus tenuimanus
Elongate lamellaria:  See Velutina prolongata
Elysia bedeckta:  See Elysia hedgpethi
Elysia hedgpethi
Emarginate dogwinkle:  See Nucella ostrina
Emarginate whelk:  See Nucella ostrina
Emerita analoga
Encrusting bryozoan:  See Membranipora membranacea
Endeavor vent whelk:  See Buccinum thermophilum
Ennucula tenuis
Enopla (Class)
Enteroctopus dofleini
Enterogona (Order)
Enteropneusta (Class)--Key
Entodesma navicula
Entodesma saxicola:  See Entodesma navicula
Entoprocta (Phylum)--Key
Epiactis fernaldi
Epiactis lisbethae
Epiactis prolifera
Epiactis ritteri
Epicaridea (Suborder)--Key
Epitoniidae (Family)--Key
Epitonium indianorum tincta:  see Epitonium tinctum
Epitonium subcornata:  see Epitonium tinctum
Epitonium tinctum
Epizoanthus scotinus
Eschricht's bittium:  See Bittium eschrichtii
Eucarida (Superorder)
Euclymene zonalis
Eucopella everta:  See Orthopyxis everta
Eudistylia vancouveri
Eunice valens
Eunicida (Order)
Eunicidae (Family)--Key
Eukrohnia borealis: See Eukrohnia hamata
Eukrohnia hamata
Eupagurus alaskensis:  See Pagurus ochotensis
Eupagurus armatus:  See Pagurus armatus
Eupagurus dalli:  See Pagurus dalli
Eupagurus granosimanus:  See Pagurus granosimanus
Eupagurus hirsutiusculus:  SeePagurus hirsutiusculus
Eupagurus mertensi:  See Pagurus hirsutiusculus
Eupagurus ochotensis:  See Pagurus ochotensis
Eupagurus ochotensis (part): See Pagurus armatus
Eupagurus turgidus:  See Paguristes turgidus
Eupentacta quinquesemita
Euplokamis cucumis:  See Hormiphora cucumis
European green crab: See Carcinus maenas
European shore crab: See Carcinus maenas
Eusergestes similis
Euspira lewisii
Euspira pallida
Eutonina indicans
Evasterias troschelii
Excirolana kincaidi
 

F
Fabia subquadrata
False cerith:  See Batillaria attramentaria
False Pacific jingle shell:  See Pododesmus macroschisma
False sea lemon:  See Archidoris montereyensis
Fat gaper clam:  See Tresus capax
Fat inkeeper worm:  See Urechis caupo
Feather duster worm:  See Eudistylia vancouveri
Feather star:  See Florometra serratissima
Fenestrate limpet:  See Tectura fenestrata
Fernald brooding anemone:  See Epiactis fernaldi, Cribrinopsis fernaldi
Fewspine spinytail:  See Systellaspis debilis
Fifteen-scaled worm:  See Harmothoe imbricata
Finmark's tunicate:  See Cnemidocarpa finmarkiensis
Fish-eating anemone:  See Urticina piscivora
Fish-eating star: See Stylasterias forreri
Fissurellidae(Family)--Key
Fissurellidea bimaculata
Flabellifera (Suborder)--Key
Flabellina opalescens: See Hermissenda opalescens
Flat Hoofsnail:  See Hipponix cranioides
Flat porcelain crab:  See Petrolisthes cinctipes
Flat spined triangle crab:  See Phyllolithodes papillosus
Flat-tipped piddock:  See Penitella penita
Flat-top piddock:  See Penitella penita
Flat topped sea squirt:  See Chelysoma productum
Flexed pandalid:  See Pandalus goniurus
Florometra perplexa:  See Florometra serratissima
Florometra serratissima
Flustrellidra corniculata
Fluted bryozoan:  See Hippodiplosia insculpta
Fluted coral bryozoan:  See Hippodiplosia insculpta
Foliate hornmouth:  See Ceratostoma foliatum
Foliated thorn purpura:  See Ceratostoma foliatum
Foolish mussel:  See Mytilus trossulus
Fragile scaleworm:  See Arctonoe fragilis
Fragile star:  See Orthasterias koehleri
Freeliving scaleworm:  See Harmothoe imbricata
Fried-egg jellyfish:  See Phacellophora camtschatica
Frilled scaleworm:  See Arctonoe fragilis
Frosted nudibranch: SeeDirona albolineata
Fusitron oregonensis
Fuzzy crab:  See Hapalogaster mertensii, Acantholithodes hispidus
 

G
Galatheidae (Family)--Key
Gammaridea (Suborder)--Key
Gaper clam:  See Tresus capax
Gastropoda (with shell)--Key
Gattyana ciliata
Geitodoris heathi
Geodia agassizi: See Geodia mesotriaena
Geodia breviana:  See Geodia mesotriaena
Geodia mesotriaena
Geoduck clam:  See Panopea abrupta
Ghost shrimp:  See Neotrypaea californiensis
Giant acorn barnacle:  See Balanus nubilus
Giant barnacle:  See Balanus nubilus
Giant brooding anemone:  See Epiactis fernaldi
Giant dendronotid:  See Dendronotus iris
Giant cupped oyster: See Magallana gigas
Giant oyster:  See Magallana gigas
Giant Pacific coast bittium:  See Bittium eschrichtii
Giant freckled dorid:  See Peltodoris lentiginosa
Giant Pacific octopus:  See Enteroctopus dofleini
Giant Pacific oyster:  See Crassostrea gigas
Giant pile worm:  See Nereis brandti
Giant plumose anemone: See Metridium farcimen
Giant pod:  See Siliqua patula
Giant red sea urchin: See Mesocentrotus franciscanus
Giant rock scallop:  See Crassodoma gigantea
Giant sea cucumber:  See Apostichopus californicus
Giant western nassa:  See Nassarius fossatus
Glassy plume hydroid:  See Plumularia setacea
Glebocarcinus oregonensis
Glycera americana
Glyceridae (Family) Key
Glycymeris septentrionalis
Glycymeris (axinola) subobsoleta: See Glycymeris septentrionalis
Glycymeris subobsoleta: See Glycymeris septentrionalis
Gnathophausia bengalensis:  See Neognathophausia ingens
Gnathophausia bidentata:  See Gnathophausia gracilis
Gnathophausia brevispina:  See Gnathophausia gracilis
Gnathophausia calcarata:  See Neognathophausia ingens
Gnathophausia childressi
Gnathophausia dentata:  See Gnathophausia gracilis
Gnathophausia doryphora:  See Neognathophausia ingens
Gnathophausia drepanephora:  See Neognathophausia gigas
Gnathophausia gigas:  See Neognathophausia gigas
Gnathophausia gracilis
Gnathophausia ingens:  See Neognathophausia ingens
Gnathophausia longispina
Gnathophausiidae (Family)--Key
Gnorimosphaeroma oregonensis
Gold dirona: See Dirona aurantia
Golden -spotted dendronotid: See Dendronotus albopunctatus
Golfingia vulgaris
Golfingia pugettensis
Gonionemus vertens
Gooseberry worm: See Sternaspis affinis
Gorgonocephalus eucnemis
Gould's dove shell: See Astyris gausapata
Graceful crab:  See Metacarcinus gracilis
Graceful kelp crab:  See Pugettia gracilis
Graceful rock crab:  See Pugettia gracilis, Metacarcinus gracilis
Grainyhand hermit crab:  See Pagurus granosimanus
Granular hermit crab:  See Pagurus granosimanusGranular claw crab:  See Oedignathus inermis
Grapsidae (Family)--Key
Grass shrimp: See Hippolyte clarki
Gray brittle star (may not be a good name):  See Ophiura luetkenii
Gray shrimp:  See Neocrangon communis
Gray whelk:  See Colus griseus
Green aggregating anemone:  See Anthopleura elegantissima
Green crab: See Carcinus maenas
Green false-jingle:  See Pododesmus macroschisma
Green grapes:  See Perophora annectensGreen sea slug:  See Phyllaplysia taylori
Green shrimp: Hippolyte clarki
Green surf anemone:  See Anthopleura xanthogrammica
Greenmark hermit:  See Pagurus caurinus
Gribble:  See Limnoria lignorum
Gritty dorid:  See Geitodoris heathi
Grooveback shrimp:  See Parapasiphae sulcatifrons
Grooved mussel crab:  See Fabia subquadrata
Ground-digger dumb-bell worm: See Sternaspis affinis
Gutless awning-clam:  See Solemya reidi
Gymnolaemata (Class)

H
Hairy chiton:  See Mopalia ciliata
Hairy sea squirt:  See Boltenia villosa
Hairy triton:  See Fusitron oregonensis
Hairy cancer crab: See Glebocarcinus oregonensis
Hairy crab:  See Hapalogaster mertensii
Hairy gilled worm:  See Thelepus crispus
Hairy hermit crab:  See Pagurus hirsutiusculus
Hairy lithodid:  See Hapalogaster mertensii
Hairy snail:  See Trichotropis cancellata
Hairy spined crab:  See Acantholithodes hispidus
Halacaridae (Famly)--Key
Haliclystus auricula:  See Haliclystus sp.
Haliclystus octoradiatus:  See Haliclystus salpinx, Haliclystus sp.
Haliclystus salpinx
Haliclystus sanjuanensis:  See Haliclystus sp.
Haliclystus stejnegeri:  See Haliclystus sp.
Haliclona ecbasis
Haliotidae (Family)--Key
Haliotis kamtschatkana
Haliotis rufescens
Halistaura cellularia:  See Mitrocoma cellularia
Halocynthia hilgendorfi:  See Halocynthia igaboja
Halocynthia hilgendorfi igaboja:  See Halocynthia igaboja
Halocynthia hispida:  See Halocynthia igaboja
Halocynthia igaboja
Halocynthia okai:  See Halocynthia igaboja
Halosydna brevisetosa
Halosydna johnsoni: See Halosydna brevisetosa
Haminoea vesicula
Hapalogaster brandti:  See Oedignathus inermis
Hapalogaster inermis:  See Oedignathus inermis
Hapalogaster mertensii
Hardshell clam:  See Leucoma staminea
Harmothoe imbricata
Heart cockle:  See Clinocardium nuttallii
Heart crab:  See Phyllolithodes papillosus
Heart lithodid:  See Phyllolithodes papillosus
Heart rock dweller:  See Petricola carditoides
Hearty petricolid:  See Petricola carditoides
Hedgehog hydroid:  See Hydractinia milleri
Hedgpeth's sea hare:  See Elysia hedgpethi
Heliometra serratissima:  See Florometra serratissima
Helmet crab:  See Telmessus cheiragonus
Helmet puncturella:  See Cranopsis cucullata
Hemichordata (Phylum)--Key
Hemigrapsus nudus
Hemigrapsus oregonensis
Henricia leviuscula
Henricia pumila
Heptacarpus brevirostris
Heptacarpus pictus: See Heptacarpus sitchensis
Heptacarpus littoralis: See Heptacarpus sitchensis
Heptacarpus sitchensis
Hermissenda crassicornis (See also Hermissenda opalescens)
Hermissenda opalescens
Hermit crabs:  See Infraorder Anomura, (mainly Family Paguridae)
Hermit worm: See Cheilonereis cyclurus
Heteropora alaskensis
Heteropora magna:  See Heteropora pacifica
Heteropora pacifica
Heteropora pacifica alaskensis: See Heteropora alaskensis
Heteropora pelliculata: See Heteropora alaskensis
Hexacorallia (Zoantharia) (Subclass)--Key
Hiatellidae (Family)--Key
Hima fratercula: See Nassarius fraterculus
Hinds' chiton:  See Mopalia hindsii
Hinnites giganteus:  See Crassodoma gigantea
Hinnites multirugosus:  See Crassodoma gigantea
Hippa analoga:  See Emerita analoga
Hippasteria phrygiana
Hippasteria spinosa: see Hippasteria phrygiana
Hippodiplosia insculpta
Hippolyte californiensis: See note in Hippolyte clarki
Hippolyte clarki
Hippolyte lamellicornis:  See Spirontocaris lamellicornis
Hippolyte sitchensis:  See Heptacarpus sitchensis
Hippolytidae (Family)--Key
Hipponicidae:  See Hipponix cranioides
Hipponix antiquatus:  SeeHipponix cranioides
Hipponix cranioides
Holothuria californica:  See Apostichopus californicus
Holothuroidea (Class)--Key
Hood puncturella:  See Cranopsis cucullata
Hooded puncturella:  See Cranopsis cucullata
Hoofshell:  See Hipponix cranioides
Hoof snail:  See Hipponix cranioides
Hopkins rose nudibranch:  See Okenia rosacea
Hopkinsia rosacea:  See Okenia rosacea
Hormiphora cucumis
Horn shells:  See Family Cerithidiidae
Horse barnacle:  See Balanus nubilus, Semibalanus cariosus
Horse clam:  See Tresus capax
Horse crab:  See Telmessus cheiragonus
Horse mussel:  See Modiolus (Modiolus) modiolus
Horse's hoofsnail:  See Hipponix cranioides
Horseshoe ascidian:  See Chelysoma productum
Humboldt squid:  See Dosidicus gigas
Humilaria kennerleyi:  See Humilaria kennerlyi
Humilaria kennerlyi
Humpback whale barnacle: Most common is Coronula diadema
Humpy shrimp:  See Pandalus goniurus
Hyale frequens:  See Protohyale sp.
Hyale rubra frequens:  See Protohyale sp.
Hyas lyratus
Hydractinia laevispina
Hydractinia milleri
Hydroida (Order)--Key to medusae
Hydroida (Order)--Key to polyps
Hydroids:  See Order Hydroida
Hydrozoa (Class)
Hymenodora frontalis
Hymenodora gracilis
Hyperiidea (Suborder)--Hyperoche medusarum
Hyperoche medusarum

I
Idotea fewkesi
Idotea ochotensis
Idotea resecata: See Pentidotea resecata
Idotea wosnesenskii: See Pentidotea wosnesenskii
Idothea resecata:  See Idotea resecata
Idothea wosnesenskii:  See Pentidotea wosnesenskii
Immigrant oyster: See Crassostrea gigas
Inflated limpet:  See Tectura persona
Inkeeper worm:  See Urechis caupo
Iridescent tubeworm:  See Eunice valens
Ischnochiton mertensii:  See Lepidozona mertensii
Isopoda (Order)--Key
 

J
Janira cucumis:  See Hormiphora cucumis
Janolus fuscus
Japanese abalone:  See Haliotis kamtschatkana
Japanese anemone: See Diadumene lineata
Japanese false cerith:  See Batillaria attramentaria
Japanese littleneck clam:  See Venerupis philippinarum
Japanese nassa: See Nassarius fraterculus
Japanese oyster:  See Crassostrea gigas
Jellyfish:  See Class Scyphozoa or Order Hydroida
Jingle shell:  See Pododesmus macroschisma
Jumbo squid:  See Dosidicus gigas
 

K
Kaburakia excelsa
Kamchatka abalone:  See Haliotis kamtschatkana
Katharina tunicata
Kelp amphipod:  See Peramphithoe humeralis
Kelp crab:  See Pugettia gracilis, Pugettia producta
Kelp encrusting bryozoan:  See Membranipora membranacea
Kelp humpback shrimp: See Hippolyte clarki
Kelp isopod:  See Pentidotea resecata
Kelp lace bryozoan:  See Membranipora membranacea
Kelletia dira See Lirabuccinum dirum
Kennerly's venus:  See Humilaria kennerlyi
Keyhole limpet:  See Diodora aspera
King clam:  See Panopea abrupta
Krygier's spinytail:  See Systellaspis cristata
 

L
Labidochirus splendescens
Lacuna carinata:  See Lacuna vincta
Lacuna divaricata:  See Lacuna vincta
Lacuna fusca:  See Lacuna vincta
Lacuna oretusa:  See Lacuna vincta
Lacuna pertusa:  See Lacuna vincta
Lacuna porrecta:  See Lacuna vincta
Lacuna solidula:  See Lacuna vincta
Lacuna variegata
Lacuna vincta
Lacuninae (Subfamily)--Key
Lacy crust bryozoan:  See Membranipora membranacea
Laila cockerelli:  See Limacea cockerelli
Lamellidoris fusca: See Onchidoris bilamellata
Lampshells:  See Phylum Brachiopoda
Laonome kroeyeri
Laqueus californianus
Large pea crab:  See Pinnixa faba
Large squid:  See Dosidicus gigas
Leafy hornmouth: See Ceratostoma foliatum
Leafy thorn purpura:  See Ceratostoma foliatumLeather limpet:  See Onchidella borealis
Leather star:  See Dermasterias imbricata
Leathery anemone:  See Urticina coriacea
Lebbeus longidactylus
Lebbeus grandimanus
Lebbeus groenlandicus
Lepadomorpha (Suborder)--Key
Lepas anatifera
Lepidonotus caelorus:  See Lepidonotus squamatus
Lepidonotus squamatus
Lepidozona mertensii
Lepidozona retiporosa
Leptasterias aequalis
Leptasterias coei (tentative)
Leptasterias hexactis
Leukoma staminea
Lewis' moon snail:  See Euspira lewisii
Lichenopora novae-zelandiae
Lichenopora verrucaria
Lightbulb ascidian:  See Clavelina huntsmani
Lightbulb tunicate:  See Clavelina huntsmani
Ligia occidentalis
Ligia pallasii
Limacea cockerelli
Limnoria lignorum
Lined anemone: See Diadumene lineata
Lineus striatus:  See Micrura verrilli
Lion nudibranch:  See Melibe leonina
Lion's mane jellyfish:  See Cyanea capillata
Lirabuccinum dirum
Lisbeth's brooding anemone:  See Epiactis lisbethae
Lithodidae(Family) --Key
Little brown barnacle: See Chthamalus dalli
Little green shrimp: See Hippolyte clarki
Little lepidozona:  See Lepidozona retiporosa
Little olive: see Callianax biplicata
Little seabristle:  See Plumularia setacea
Littleneck clam:  See  Leukoma staminea
Littorinidae (Family)--Key
Littorina scutulata
Littorina sitchana:  See Littorina sitkana
Littorina sitkana
Littorina subrotundata
Lobata (Order)
Lobate ctenophore:  See Bolinopsis infundibulum
Lobed sea gooseberry:  See Bolinopsis infundibulum
Long armed brittle star:  See Amphiodia urtica
Long-armed sea star:  See Orthasterias koehleri , Stylasterias forreri
Longhorn decorator crab:  See Chorilia longipes
Long clam:  See Mya arenaria
Long-horned beach hopper:  See Megalorchestia californiana
Long-necked clam:  See Mya arenaria
Longrayed starfish:  See Orthasterias koehleri , Stylasterias forreri
Long-stalked sea squirt:  See Styela montereyensis
Lopha posjetica: See Crassostrea gigas
Lophogaster ingens:  See Neognathophausia ingens
Lophogastrida (Order)--Key
Lopholithodes foraminatus
Lopholithodes mandtii
Lophopanopeus bellus subspecies bellus
Lottia alveus
Lottia asmi
Lottia digitalis
Lottia fenestrata:  See Tectura fenestrata
Lottia gigantea
Lottia instabilis
Lottia pelta
Lottiidae (Family)--Key
Loxosomella sp.
Lugworms:  See Family Arenicolidae
Lugworm pea crab:  See Pinnixa eburna
Luidia foliolata
Lunatia lewisii:  See Euspira lewisii
Lunatia pallida: See Euspira pallida
Lurid oyster:  See Ostrea lurida
Lurid rock snail: See Paciocinebrina lurida
Lyonsia saxicola:  see Entodesma navicula
Lyonsiidae (Family)--Key
Lyre crab:  See Hyas lyratus

M
Macoma balthica: See Macoma balthica
Macoma inconspicua: See Macoma balthica
Macoma kelseyi:  See Macoma nasuta
Macoma nasuta
Macoma tersa:  See Macoma nasuta
Mactridae (Family)--Key
Magallana gigas
Manila clam:  See Venerupis philippinarum
 Majidae (Family)--Key
Maldanidae (Family)--Key
Maned nudibranch:  See Aeolidia papillosa
Manila clam: See Venerupis philippinarum
Mantle pea crab:  See Pinnixa faba
Many-gilled Onchidoris: See Onchidoris bilamellata
Many-gilled sea slug: See Onchidoris bilamellata
Many-ribbed hydromedusa:  See Aequorea victoria
Market crab:  See Metacarcinus magister
Mask limpet:  See Tectura persona
Masked limpet:  See Tectura persona
Maxillopoda (Class)
Mayerella banksia
Mediaster aequalis
Megalorchestia californiana
Megatebennus bimaculatus:  SeeFissurellidea bimaculata
Melibe leonina
Membranipora horrida:  See Callopora horrida
Membranipora membranacea
Merten's chiton:  See Lepidozona mertensii
Mesocentrotus franciscanus
Metacaprella kennerlyi: See Caprella kennerlyi
Metacarcinus gracilis
Metacarcinus magister
Metacrangon munita
Metandrocarpa taylori
Metridium farcimen
Metridium giganteum: See Metridium farcimen
Metridium senile subsp. fimbriatum
Micropodarke dubia
Micrura verrilli
Miller hydractinia:  See Hydractinia milleri
Mites (marine):  See Family Halacaridae
Mitella polymerus:  See Pollicipes polymerus
Mitrella gausapata: See Astyris gausapata
Mitrella gouldi: See Astyris gausapata
Mitrella tuberosa: See Alia tuberosa
Mitrocoma cellularia
Miyagi oyster:  See Crassostrea gigas
Modest tellina:  See Tellina modesta
Modiolus (Modiolus) modiolus
Moerella bodegensis:  See Tellina bodegensis
Mole crab:  See Emerita analoga
Mollusca (Phylum)--Key
Money shell:  See Pododesmus macroschisma or Saxidomus gigantea
Monociostrea vancouverensis:  See Ostrea lurida
Montacutidae (Family)--Key
Monterey dorid:  See Archidoris montereyensis
Monterey sea lemon:  See Archidoris montereyensis
Monterey stalked tunicate:  See Styela montereyensis
Moon jelly:  See Aurelia aurita
Moon snail:  See Euspira lewisii
Mopalia ciliata
Mopalia hindsii
Mopalia lignosa
Mopalia muscosa
Mopalia spectabilis
Mopalia swanii
Morning sun star:  See Solaster dawsoni
Moroteuthis japonica: See Onykia robusta
Moroteuthis pacifica: See Onykia robusta
Moroteuthis robusta: See Onykia robusta
Moroteuthis robustus: See Onykia robusta
Mossy chiton:  See Mopalia muscosa
Mossy nudibranch:  See Aeolidia papillosa
Mottled anemone:  See Urticina crassicornis
Mottled Henricia:  See Henricia pumila
Mottled red chiton:  See Lepidozona mertensii
Mud clam:  See Mya arenaria
Mud nemertean:  See Paranemertes peregrini
Mud owl: See Sternaspis affinis
Muggiaea atlantica
Munida quadrispina
Murex:  See Family Muricidae
Muricidae (Family)--Key
Mushroom ascidian:  See Distaplia occidentalis
Mussel crab:  See Fabia subquadrata
Mussel worm:  See Nereis vexillosa
Muusoctopus leioderma
Mya arenaria
Mycale adhaerens
Myidae (Family)--Key
Myosotella myosotis
Mysids--Key
Mytilidae (Family)--Key
Mytilimeria nuttalli
Mytilus californianus
Mytilus edulis:  See Mytilus trossulus
Mytilus trossulus
Myxicola infundibulum
Myxilla incrustans
 

N
Nanaimo dorid:  See Acanthodoris nanaimoensis
Nanny nose:  See Mya arenaria
Nassa fossatus:  See Nassarius fossatus
Nassa (Hima) fraterculus: See Nassarius fraterculus
Nassa hypolina: See Nassarius fraterculus
Nassa nodosa: See Nassarius fraterculus
Nassa semiplicata hiradoensis: See Nassarius fraterculus
Nassa semiplicata hizenensis: See Nassarius fraterculus
Tritia fratercula: See Nassarius fraterculus
Nassariidae (Family)--Key
Nassarius fossatus
Nassarius fraterculus
Natantia (shrimp)--Key
Natica clausa: See Euspira pallida
Naticidae (Family)--Key
Native pacific oyster:  See Ostrea lurida
Neaeromyra rugifera: See Pseudopythina rugifera
Nemertea (Phylum)--Key
Neocrangon communis
Neognathophausia gigas
Neognathophausia ingens
Neoloricata (Order)
Neoturris brevicornis
Neotrypaea californiensis
Nephtyidae (Family)--Key
Nephtys ferruginea
Neptuneidae (Family)--Key
Nereidae (Family)--Key
Nereis vexillosa
Nereis brandti
Nestling clam:  See Petricola carditoides
Newcomb's littorina snail: See Littorina subrotundata
Nipponemertes bimaculatus:  See Amphiporus bimaculatus
Nitidella gausapata: See Astyris gausapata
Nitidella lutulenta: See Astyris gausapata
Nitidiscala eelense:  See Epitonium tinctum
Nitidiscala tincta:  See Epitonium tinctum
Noble Pacific doris:  See Peltodoris nobilis
Nodding heads:  See Barentsia robusta
North Pacific giant octopus:  See Enteroctopus dofleini
Northern abalone:  See Haliotis kamtschatkana
Northern baltic macoma: See Macoma balthica
Northern bay mussel:  See Mytilus trossulus
Northern chink shell:  See Lacuna vincta
Northern feather duster worm:  See Eudistylia vancouveri
Northern hooded shrimp:  See Betaeus harrimani
Northern kelp crab:  See Pugettia producta
Northern lacuna:  See Lacuna vincta
Northern moon shell: See Euspira pallida
Northern opalescent nudibranch: See Hermissenda crassicornis
Northern razor clam:  See Siliqua patula
Northern red anemone:  See Urticina crassicornis
Northern shrimp:  See Pandalus eous
Northern staghorn bryozoan:  See Heteropora pacifica
Northern striped dogwinkle:  See Nucella ostrina
Northwest Onchidella:  See Onchidella borealis
Northwest Ugly clam:  see Entodesma navicula
Notaspidea (Order)-example Berthella californica
Notoacmea fenestrata:  See Tectura fenestrata
Notoacmea insessa:  See Discurria insessa
Notoacmea persona:  See Tectura persona
Notoacmea scutum:  See Tectura scutum
Notaspidea (Order)--Species Berthella californica
Nucella canaliculata
Nucella emarginata:  See Nucella ostrina
Nucella lamellosa
Nucella ostrina
Nucellidae (Family)--Key
Nucula bellotii: See Ennucula tenuis
Nucula quirica: See Ennucula tenuis
Nucula tenuis:  See  Ennucula tenuis
Nuculidae (Family--Key
Nuculoida (Order)--Key
Nuculoma tenuis:  See Ennucula tenuis
Nudibranchia (Order)--Key
Nuttallia obscurata
 

O
Obelia dichotoma
Ocean sergestid:  See Sergia tenuiremis
Ocenebra lurida: See Pacocenibrina lurida
Ochre sea star:  See Pisaster ochraceus
Octocorallia(Subclass)--Key.  See Subclass Alcyonaria
Octopus and squid:  See Class Cephalopoda
Octopus apollyon:  See Enteroctopus dofleini
Octopus dofleini:  See Enteroctopus dofleini
Octopus hongkongensis:  See Enteroctopus dofleini
Octopus leioderma: See Muusoctopus leioderma
Octopus punctatus:  See Enteroctopus dofleini
Octopus rubescens
Oedignathus gilli:  See Oedignathus inermis
Oedignathus inermis
Okenia rosacea
Olive-green isopod:  See Idotea wosnessenskii
Olivella baetica:  See Callianax baetica
Olivella boetica:  See Callianax baetica
Olivella biplicata: see Callianax biplicata
Olivella diegensis:  See Callianax baetica
Olivella intorta:  See Callianax baetica
Olivella mexicana:  See Callianax baetica
Olivella pedrona:  See Callianax baetica
Olivella porteri:  See Callianax baetica
Olividae (Family)--Key
Olympia oyster: See Ostrea lurida
Ommastrephes giganteus:  See Dosidicus gigas
Ommastrephes robustus: See Onykia robusta
Onchidella borealis
Onchidoris bilamellata
Onchidoris fusca: See Onchidoris bilamellata
Onchidoris hystricina:  See Diaphorodoris lirulatocauda for our local species
Onchyteuthis robusta: See Onykia robusta
Oniscoidea (Suborder)--Key
Onykia japonica: See Onykia robusta
Onykia robusta
Opalescent nudibranch:  See Hermissenda crassicornis and Hermissenda opalescens
Opalia montereyensis
Ophiodromus pugettensis: See Oxydromus pugettensis
Ophiopholus aculeata
Ophiopteris papillosa
Ophiura luetkenii
Ophiuroidea (Class)--Key
Opisthobranchia (Subclass)
Oplophoridae (Family)--Key
Oplophorus spinosus
Opisthobranchia (Subclass)--Key
Orange anemone:  See Stomphia didemon
Orange-clubbed nudibranch:  See Limacea cockerelli
Orange colonial sea squirt:  See Distaplia occidentalis
Orange hairy hermit:  See Paguristes turgidus
Orange peel nudibranch:  See Tochuina tetraquetra
Orange sea cucumber:  See Cucumaria miniata
Orchestoidea californiana:  See Megalorchestia californiana
Oregon queen crab:  See Lopholithodes foraminatus
Oregon rock crab: See Glebocarcinus oregonensis
Orange sea squirt:  See Cnemidocarpa finmarkiensis
Orange social ascidian:  See Metandrocarpa taylori
Orange social sea squirt:  See Metandrocarpa taylori
Orange-striped green anemone: See Diadumene lineata
Orange-striped jellyfish:  See Gonionemus vertens
Oregonia gracilis
Orobitella rugifera:  see Pseudopythina rugifera
Orthasterias columbiana:  See Orthasterias koehleri
Orthasterias forreri: See Stylasterias forreri
Orthasterias koehleri
Orthasterias leptolena: See Stylasterias forreri
Orthione griffenis
Orthopyxis everta
Ostrea chemnitzii var elongata: See Crassostrea gigas
Ostrea cymbaeformis: See Crassostrea gigas
Ostrea gigas: See Crassostrea gigas
Ostrea gravitesta:  See Crassostrea gigas
Ostrea laperousii: See Crassostrea gigas
Ostrea lurida
Ostrea posjetica: See Crassostrea gigas
Ostrea rostralis: See Crassostrea gigas
Ostrea talienwhanensis: See Crassostrea gigas
Ostreidae (Family)--Key
Ostreola conchaphila: See Ostrea lurida
Ostrich plume hydroid:  See Aglaophenia sp.
Otter clam:  See Tresus capax
Oval yoldia:  See Yoldia myalis
Oxydromus pugettensis
 

P
Pachycerianthus fimbriatus
Pachycheles rudis
Pachygrapsus crassipes
Pacific blue mussel:  See Mytilus trossulus
Pacific branching bryozoan:  See Bugula californica
Pacific chinese hat snail:  See Calyptraea fastigiata
Pacific coast bittersweet: See Glycymeris septentrionalis
Pacific cupped oyster: See Crassostrea gigas
Pacific geoduck clam:  See Panopea abrupta
Pacific giant octopus:  See Enteroctopus dofleini
Pacific lugworm:  See Abarenicola pacifica
Pacific lyre crab:  See Hyas lyratus
Pacific neapolitan lugworm:  See Abarenicola pacifica
Pacific oyster:  see Crassostrea gigas
Pacific plate limpet:  See Tectura scutum
Pacific razor clam:  See Siliqua patula
Pacific rock crab:  See Cancer antennarius
Pacific rough piddock:  See Zirfaea pilsbryi
Pacific sand crab: See Emerita analoga
Pacific sand dollar:  See Dendraster excentricus
Pacific sea lemon:  See Peltodoris nobilis
Paddle ascidian:  See Distaplia smithi
Paguristes turgidus
Paguridae (Family)--Key
Pagurus alaskensis:  See Pagurus ochotensis
Pagurus armatus
Pagurus beringanus
Pagurus caurinus
Pagurus dalli
Pagurus granosimanus
Pagurus hirsutiusculus
Pagurus (Trigonocheirus) hirsutiusculus:  See Pagurus hirsutiusculus
Pagurus kennerlyi
Pagurus (Eupagurus) mertensi:  See Pagurus hirsutiusculus
Pagurus ochotensis
Pagurus ochotensis (part):  See Pagurus armatus
Pagurus quaylei
Pagurus samuelis
Pagurus stevensae
Painted anemone:  See Urticina crassicornis
Painted brittle star:  See Ophiopholus aculeata
Painted star:  See Orthasterias koehleri
Painted Tealia:  See Urticina crassicornis
Painted Urticina:  See Urticina crassicornis
Painted wentletrap:  See Epitonium tinctum
Pale creeping pedal sea cucumber:  See Psolidiuim bidiscum
Pale northern moon snail: See Euspira pallida
Pallid moon snail: See Euspira pallida
Pandalidae (Family)--Key
Pandalopsis dispar
Pandalus borealis:  See Pandalus eous
Pandalus borealis eous:  See Pandalus eous
Pandalus danae
Pandalus dapifer:  See Pandalus goniurus
Pandalus eous
Pandalus goniurus
Pandalus montagui tridens:  See Pandalus tridens
Pandalus platyceros
Pandalus stenolepis
Pandalus tridens
Panopa abrupta:  See Panopea abrupta
Panopa generosa:    See Panopea abrupta
Panopea abrupta
Panopea generosa:    See Panopea abrupta
Paphia staminea:  See  Leukoma staminea
Papillid crab:  See Phyllolithodes papillosus
Papillose aeolid:  See Aeolidia papillosa
Paracrangon echinata
Paralvinella palmiformis
Paralvinella sulfincola
Paranemertes peregrina
Parapholas californica
Parasitic pea crab:  See Fabia subquadrata
Parastichopus californicus: See Apostichopus californicus
Parchment tube worm:  See Eudistylia vancouveri
Paroctopus sp:  See Enteroctopus dofleini
Parapasiphae sulcatifrons
Pasiphaeidae (Family)--Key
Patellogastropoda (Order)--Key
Patiria miniata
Paxillose crab:  See Oedignathus inermis
Pea crab:  See Pinnixa faba, Fabia subquadrata
Peanut sea squirt:  See Styela gibbsii
Peanut worm:  See Phylum Sipuncula
Pea-pod borer:  See Adula californiensis
Pearly monia:  See Pododesmus macroschisma
Pectinidae (Family)--Key
Peltodoris lentiginosa
Penaeidae(Family)--Key
Penitella penita
Penitella turnerae
Pennatulacea (Order)--Key
Pentacta piperata:  See Cucumaria piperata
Pentidotea resecata
Pentidotea wosnessenskii
Peppered sea cucumber:  See Cucumaria piperata
Peracarida (Suprorder)
Peramphithoe humeralis
Perophora annectens
Petaloceras berianus:  See Phyllolithodes papillosus
Petricola carditoides
Petricolidae(Family)--Key
Petrolisthes cinctipes
Petrolisthes eriomerus
Phacellophora camtschatica
Phascolosoma agassizii
Phidiana crassicornis:  See Hermissenda crassicornis
Phlebobranchia (Order)
Pholadidae (Family)--Key
Phoxichilidium femoratum
Phyllaplysia taylori
Phyllaplysia zostericola:  See Phyllaplysia taylori
Phyllodocida (Order)
Phyllodocidae (Family)--Key
Phyllolithodes bicornis:  See Phyllolithodes papillosus
Phyllolithodes papillosus
Phronima sedentaria
Piddock clams:  See Family Pholadidae
Pile worm:  See Nereis brandti, Nereis vexillosa
Pilsbry piddock:  See Zirfaea pilsbryi
Pink mud shrimp:  See Neotrypaea californiensis
Pink scallop: See Chlamys rubida
Pink shrimp:  See Pandalus eous
Pink tritonia:  See Tritonia diomedea
Pinnixa eburna
Pinnixa faba
Pinnixa tubicola
Pinnothera faba:  See Pinnixa faba
Pinnotheres concharum:  See Fabia subquadrata
Pinnotheres faba:  See Pinnixa faba
Pinnotheridae(Family)--Key
Pinto abalone:  See Haliotis kamtschatkana
Pisaster brevispinus
Pisaster ochraceus
Placetron wosnessenskii
Placiphorella velata
Plagioecia patina
Plate limpet:  See Tectura scutum
Platyhelminthes(Phylum) Class Turbellaria--Key
Platynereis bicanaliculata: See also Micropodarke dubia
Pleurobrachia bachei
Pleurophyllidia californica:  SeeArmina californica
Plicifusus griseus:  See Colus griseus
Plume worm:  See Eudistylia vancouveri, Serpula vermicularis
Plumularia corrugata:  See Plumularia setacea
Plumularia setacea
Podarke pugettensis:  See Oxydromus pugettensis
Pododesmus cepio:  See Pododesmus macroschisma
Pododesmus macroschisma
Polinices lewisii:  See Euspira lewisii
Polinices pallidus: See Euspira pallida
Pollicipes polymerus
Polychaeta (Class)--Key
Polycarpa finmarkiensis:  See Cnemidocarpa finmarkiensis
Polychaete worm pea crab:  See Pinnixa tubicola
Polycladida (Order)--Key
Polynoe fragilis:  See  Arctonoe fragilis
Polynoe brevisetosa: See Halosydna brevisetosa
Polynoidae (Family)--Key
Polyorchis penicillatus
Polyplacophora (Class)--Key
Polypus apollyon:  See Enteroctopus dofleini
Polypus hongkongensis:  See Enteroctopus dofleini
Polypus leioderma: See Muusoctopus leioderma
Porcellanidae (Family)--Key
Porcupine dorid:  See Diaphorodoris lirulatocauda
Porifera (Phylum)--Key
Portuguese oyster: See Crassostrea gigas
Praxilla zonalis:  See Euclymene zonalis
Proboscis worms: See Phylum Nemertea or Polychaete Family Glyceridae
Propeamussidae (Family)--Key
Prosobranchia (Subclass)--Key
Protohyale sp.
Protothaca semidecussata:  See Venerupis philippinarum
Protothaca staminea:  See Leukoma staminea
Pseudochama exogyra
Pseudocnus curatus
Pseudocnus lubricus:  See also Pseudocnus curatus
Pseudopythina rugifera
Pseudosuberites pseudos:  See Cliona californiana
Psolidium bidiscum
Psolidium bullatum:  SeePsolidium bidiscum
Psolus californicus:  See Psolus chitonoides
Psolus chitonoides
Pteraster tesselatus
Pterorytis foliatus:  See Ceratostoma foliatum
Ptilosarcus gurneyi
Puget Sound box crab:  See Lopholithodes foraminatus
Pugettia gracilis
Pugettia lordii:  See Pugettia gracilis
Pugettia producta
Pugettia quadridens var gracilis:  See Pugettia gracilis
Pulmonata (Subclass)
Puncturella cucullata:  See Cranopsis cucullata
Puncturella galeata
Purple encrusting bryozoan:  See Disporella separata
Purple-hinged rock scallop:  See Crassodoma gigantea
Purple magogany clam:  See Nuttallia obscurata
Purple Olivella: see Callianax biplicata
Purple olive shell: see Callianax biplicata
Purple ribbon worm:  See Paranemertes peregrini
Purple sea star:  See Pisaster ochraceus
Purple varnish clam: See Nuttalia obscurata
Purpurata foliata:  See Ceratostoma foliatum
Pycnogonid:  See Tanystylum occidentalis, Pycnogonum stearnsi
Pycnogonida(Class)--Key
Pycnogonum stearnsi
Pycnopodia helianthoides
Pygmy rock crab: See Glebocarcinus oregonensis
Pyrenidae (Family):  See Family Columbellidae
Pyura haustor
Pyura okai:  See Halocynthia igaboja
 

Q
Quayle's hermit crab:  See Pagurus quaylei
 

R
Rainbow star:  See Orthasterias koehleri
Raphnotus subquadrata:  See Fabia subquadrata
Razor clam:  See Siliqua patula
Red abalone Haliotis rufescens
Red and green anemone:  See Urticina crassicornis
Red-and-white-banded sea-nymph: See Cheilonereis cyclurus
Red-and-white-banded worm: See Cheilonereis cyclurus
Red ascidian:  See Aplidium solidum
Red banded commensal scale worm:  See Arctonoe vittata
Red banded seastar:  See Orthasterias koehleri
Red-banded transparent coastal shrimp:  See Heptacarpus sitchensis
Red bead anemone:  See Urticina coriacea
Red-brown bristly crab:  See Hapalogaster mertensii
Red cancer crab:  See Cancer productus
Red chiton:  See Tonicella insignis; Lepidozona mertensii
Red commensal scaleworm:  See Arctonoe pulchra
Red-eye jellyfish:  See Polyorchis penicillatus
Red-flecked Mopalia:  See Mopalia spectabilis
Red fur crab:  See Acantholithodes hispidus
Red ghost shrimp:  See Neotrypaea californiensis
Red gilled dorid:  See Acanthodoris nanaimoensis
Red rock crab:  See Cancer productus, Romaleon antennarius
Red sea buttons:  See Metandrocarpa taylori
Red sea cucumber:  See Cucumaria miniata
Red sea gherkin:  See Cucumaria miniata
Red sea squirt:  See Cnemidocarpa finmarkiensis
Red nudibranch:  See Rostanga pulchra
Red sponge doris:  See Rostanga pulchra
Red sponge nudibranch:  See Rostanga pulchra
Red urchin: See Mesocentrotus franciscanus
Restless ribbon worm:  See Paranemertes peregrina
Rhamphostomella costata
Rhinolithodes wosnessenskii
Rhizocephalan barnacles--Key
Rhizocephalan parasitic barnacle Sylon hippolytes
Ribbed carpet shell:  See Leukoma staminea
Ribbed clam:  See Humilaria kennerlyi
Ribbed dogwinkle:  See Nucella ostrina
Ribbed rock whelk:   See Nucella ostrina
Ring-spotted dorid:  See Dialula sandiegensis
Rocinela propodialis
Rock barnacle:  See Semibalanus cariosus
Rock clam:  See Penitella penita, Leukoma staminea
Rock cockle:  See Leukoma staminea
Rock crab:  See Romaleon antennarius
Rock dweller:  See Petricola carditoides
Rock-dwelling clam:  See Entodesma navicula, Petricola carditoides
Rock Entodesma:  See Entodesma navicula
Rock louse:  See Ligia pallasii, Ligia occidentalis
Rock oyster:  See Pododesmus macroschisma
Rock scallop:  See Crassodoma gigantea
Rock thais:  See Nucella ostrina
Rock whelk:  See Nucella ostrina
Rocking chair limpet:  See Lottia instabilis
Rockweed isopod:  See Idotea wosnessenskii
Romaleon antennarium
Rough keyhole limpet:  See Diodora aspera
Rough-mantles sea slug: See Onchidoris bilamellata
Rough patch shrimp:  See Pandalus stenolepis
Rough piddock:  See  Zirfaea pilsbryi
Rough scallop: See Chlamys hastata
Rossia pacifica
Rostanga pulchra
Ruditapes philippinarum:  See Venerupis philippinarum
Ruffled scaleworm:  See Arctonoe fragilis
Rufous-tipped nudibranch:  See Acanthodoris nanaimoensis
Rusty scaleworm:  See Lepidonotus squamatus

S
Sabellida (Order)
Sabellidae (Family)--Key
Saccoglossus bromophenolosusSacoglossa (Order)--Key
Saltmarsh periwinkle:  See Littorina subrotundata
Saltmarsh pulmonate snail:  See Myosotella myosotis
San Diego Dorid:  See Dialula sandiegensis
San Pedro rice shell: see Callianax biplicata
Sand anemone:  See Urticina columbiana
Sand beach isopod:  See Excirolana kincaidi
Sandy beach isopod:  See Excirolana kincaidi
Sand crab:  See Emerita analoga
Sand dollar:  See Dendraster excentricus
Sand gaper:  See Mya arenaria
Sand piranhas: See Excirolana kincaidi
Sand rose anemone:  See Urticina columbiana
Sandworm:  See Nephtys ferruginea, Nereis vexillosa
Saxidomus gigantea
Saxidomus giganteus:  See Saxidomus gigantea
Scale-sided piddock:  See Parapholas californica
Scaleworm:  See Arctonoe fragilis, Arctonoe pulchra,Arctonoe vittata
Scapellomorpha (Suborder)--Key
Scarlet anemone:  See Urticina coriacea
Schizobranchia insignis
Schizoporella insculpta:  See Hippodiplosia insculpta
Schizothaerus capax:  See Tresus capax
Scleractinia (Order)--Key
Sclerocrangon communis:  See Neocrangon communis
Scleroplax granulata
Screw snail:  See Bittium eschrichtii, Batillaria attramentaria
Sculptured bryozoan:  See Hippodiplosia insculpta
Sculptured nutshell: see Acila castrensis
Scyra acutifrons
Scyphozoa (Class)--Key (Jellyfish)
Sea anenones:  See Order Actiniaria
Sea bat:  See Patiria miniata
Sea blubber:  See Cyanea capillata
Sea bottle clam:  See Mytilimeria nuttalli
Sea clown nudibranch:  See Triopha catalinae
Sea cucumbers:  See Class Holothuroidea
Sea fir:  See Abietinaria inconstans
Sea flea:  See Amphipod suborder Gammaridea or Protohyale sp.  etc.
Sea gooseberry:  See Pleurobrachia bachei
Sea grapes:  See Perophora annectens
Sea hare: See Phyllaplysia taylori
Sea lemon:  See Peltodoris nobilis
Sea mouse:  See Aphrodita japonica or another member of Family Aphroditidae or the nudibranch Aeolidia papillosa
Sea nettle:  See Cyanea capillata; Chrysaora fuscescens
Sea peanut:  See Styela gibbsii
Sea plume:  See Obelia dichotoma
Sea pork:  See Aplidium solidum, Aplidium californicum
Sea squirt:  See Class Ascidiacea
Sea stars:  See Class Asteroidea
Sea urchins:  See Class Echinoidea
Sea walnut:  See Pleurobrachia bachei
Searlesia dira: See Lirabuccinum dirum
Sea spider:  See Class Pycnogonida
Seaweed isopod:  See Idotea resecata
Seaweed muffs:  See Flustrellidra corniculata
Semaeostomae (Order)--Key
Semibalanus cariosus
Sepia nigra:  See Dosidicus gigas
Sepia tunicata:  See Dosidicus gigas
Sergestes similis:  See Euseregestes similis
Sergestidae(Family)--Key
Sergia tenuiremis
Serpula columbiana
Serpula spirillum:  See Circeis spirillum
Serpula vermicularis: See Serpula columbiana
Serpulidae (Family)--Key
Shag-rug aeolis:  See Aeolidia papillosa
Shag rug nudibranch:  See Aeolidia papillosa
Shaggy dovesnail: See Astyris gausapata
Shaggy mouse nudibranch:  See Aeolidia papillosa
Shellbinder worm:  See Thelepus crispus or Thelepus setosus
Shield-backed kelp crab:  See Pugettia producta
Shiny orange sea squirt:  See Cnemidocarpa finmarkiensis
Shiny red tunicate:  See Cnemidocarpa finmarkiensis
Short-spined shrimp:  See Heptacarpus brevirostris
Short-spired purple:  See Nucella ostrina
Shrimp:  See Natantia for families of true shrimp and prawns, Thalassinidea for mud and ghost shrimp
Shrimp parasitic isopod:  See Bopyroides hippolytes
Sidestriped shrimp:  See Pandalopsis dispar
Siliqua patula
Siphonophora (Order)--Key
Sipuncula (Phylum)--Key
Sitka coastal shrimp:  See Heptacarpus sitchensis
Sitka littorinid:  See Littorina sitkana
Sitka periwinkle:  See Littorina sitkana
Sitka shrimp:  See Heptacarpus sitchensis
Six-armed star:  See Leptasterias hexactis, Leptasterias aequalis, Leptasterias coei (tentative)
Six-rayed star:  See six-armed star
Skeleton shrimp:  See Caprellidea, Mayerella banksia, Tritella pilimana, Caprella angusta, Caprella kennerlyi
Slender crab:  See Metacarcinus gracilis
Slender kelp crab:  See Pugettia gracilis
Slender-spined bryozoan:  See Callopora horrida
Slime feather duster:  See Myxicola infundibulum
Slime tube worm:  See Myxicola infundibulum
Slipper sea cucumber:  See Psolus chitonoides
Small brittle star:  See Ophiura luetkenii
Small northern abalone:  See Haliotis kamtschatkana
Smith's distaplia:  See Distaplia smithi
Smooth leather bryozoan:  See Alcyonidium pedunculatum
Smooth nutclam:  See Ennucula tenuis
Smooth porcelain crab:  See Petrolisthes cinctipes
Smooth velvet snail:  See Velutina prolongata
Smooth Washington Clam:  See Saxidomus gigantea
Smoothskin octopus: See Muusoctopus leioderma
Snakelock anemone:  See Cribrinopsis fernaldi
Snail fur:  See Hydractinia milleri, Hydractinia laevispina
Snow crab:  See Chionoecetes bairdi
Snow white dorid:  See Doris odhneri
Soft bellied crab:  See Oedignathus inermis
Soft clam:  See Mya arenaria
Softshell clam:  See Mya arenaria
Solaster dawsoni
Solaster stimpsoni
Solemya reidi
Southern opalescent nudibranch: See Hermissenda opalescens
Southern tanner crab:  See Chionoecetes bairdi
Spaghetti worm:  See Thelepus crispus,  Thelepus japonicus, or Thelepus setosus
Speckled limpet:  See Tectura persona
Sphaerostoma diomedea:  See Tritonia diomedea
Spider crab:  See Pugettia gracilis, Pugettia producta
Spiny headed tunicate:  See Boltenia villosa
Spiny lebbeid:  See Lebbeus groenlandicus
Spiny legged lithode crab:  See Phyllolithodes papillosus
Spiny lithodid crab:  See Acantholithodes hispidus
Spiny red seastar: See Hippasteria phrygiana
Spiny thigh sea spider:  See Phoxichilidium femoratum
Spiral bryozoan:  See Bugula californica
Spirorbidae(Family)--Key
Spirontocaris brevirostris:  See Heptacarpus brevirostris
Spirontocaris lamellicornis
Spirontocaris sitchensis:  See Heptacarpus sitchensis
Spirontocaris spina intermedia
Split-plum feather-duster:  See Schizobranchia insignis
Spoonworm, Alaska.  See Echiurus echiurus subspecies alaskanus
Spot-bellied rock crab:  See Romaleon antennarius
Spot shrimp:  See Pandalus platyceros
Spotted swimming anemone:  See Stomphia coccinea
Squat lobster: See Munida quadrispina
Squid and octopus:  See Class Cephalopoda
Stalked hairy sea squirt:  See Boltenia villosa
Stalked tunicate:  See Styela montereyensis
Seastars:  See Class Asteroidea
Stauromedusae (Order)--Key
Steamer clam:  See Mya arenaria
Stearns' pycnogonid:  See Pycnogonum stearnsi
Stenolaemata (Class)
Stenoplax heathiana
Stereoderma miniata:  See Cucumaria miniata
Sternaspis affinis
Stichopus californicus:  See Apostichopus californicus
Stiff-stalked bryozoan:  See Bugula californica
Stiliger fuscovittatus
Stilomysis grandis
Stolidobranchia (Order)
Stomphia coccinea
Stomphia didemon
Stout coastal shrimp:  See Heptacarpus brevirostris
Stout crangon:  See Crangon alba
Stout shrimp:  See Heptacarpus brevirostris
Strawberry anemone:  See Corynactis californica or  Urticina lofotensis
Streaked stiliger:  See Stiliger fuscovittatus
Striped dogwinkle:  See Nucella ostrina
Strongylocentrotus droebachiensis
Strongylocentrotus franciscanus: See Mesocentrotus franciscanus
Strongylocentrotus pallidus
Strongylocentrotus purpuratus
Stubby rose anemone:  See Urticina coriacea
Styela elsa:  See Cnemidocarpa finmarkiensis
Styela finmarkiensis:  See Cnemidocarpa finmarkiensis
Styela gibbsii
Styela joannae:  See Cnemidocarpa finmarkiensis
Styela montereyensis
Styela stimpsoni:  See Cnemidocarpa finmarkiensis
Stylasterias forreri
Stylissa stipitata
Suberites subereaforma latus
Sulfide worm:  See Paralvinella sulfincola
Sulphur sponge:  See Cliona californiana
Summer clam:  See Tresus capax
Sunburst anemone:  See Anthopleura sola
Swan's mopalia:  See Mopalia swanii
Swimming anemone:  See Stomphia didemon
Sylon hippolytes
Symbiotic scaleworm:  See Arctonoe fragilis, Arctonoe pulchra, Arctonoe vittata
Syringella amphispicula
Systellaspis braueri
Systellaspis cristata
Systellaspis debilis
 

T
Talitridae (Family):  Beach Hoppers
Tall-spired snail:  See Batillaria attramentaria
Tanner crab:  See Chionoecetes bairdi
Tanystylum occidentalis
Tapes japonica:  See Venerupis philippinarum
Tapes philippinarum:  SeeVenerupis philippinarum
Tapes semidecussata:  See Venerupis philippinarum
Taylor's colonial tunicate:  See Metandrocarpa taylori
Taylor's sea hare:  See Phyllaplysia taylori
Taylor's social tunicate:  See Metandrocarpa taylori
Tealia crassicornis:  SeeUrticina crassicornis
Tealia piscivora:  See Urticina piscivora
Tectura fenestrata
Tectura persona
Tectura scutum
Tegella horrida:  See Callopora horrida
Tegula brunnea:  See Chlorostoma brunnea
Tegula eiseni
Tegula funebralis:  See Chlorostoma funebralis
Tellina bodegensis
Tellina buttoni: See Tellina modesta
Tellina modesta
Tellina santarosae:  See Tellina bodegensis
Tellinidae (Family)--Key
Telmessus cheiragonus
Tent nutshell: See Acila castrensis
Terebellida (Order)
Terebellidae (Family)--Key
Terebellides stroemi
Terebratalia transversa
Tethyum finmarkiensis:  See Cnemidocarpa finmarkiensis
Tethyum igaboja:  See Halocynthia igaboja
Thais canaliculata:  See Nucella canaliculata
Thais emarginata:  See Nucella ostrina
Thais lamellosa:  See Nucella lamellosa
Thaumantias cellularia:  See Mitrocoma cellularia
Thalassinidea (Infraorder)--Key
Thatched barnacle:  See Semibalanus cariosus
Thelepus crispus
Thelepus japonicus
Thelepus setosus
Thick amphiporus:  See Amphiporus bimaculatus
Thick-petaled rose anemone:  See Urticina crassicornis
Thoracica (Superorder)
Thoridae (Family)--in this key, keys with Family Hippolytidae
Thorny seastar: See Hippasteria phrygiana
Threaded bittium:  See Bittium eschrichtii
Threaded horn shell:  See Bittium eschrichtii
Tinted wentletrap:  See Epitonium tinctum
Tiny pink clam: See Macoma balthica
Tochni:  See Tochuina tetraquetra
Tochuina tetraquetra
Tomales bay cockle:  See Leukoma staminea
Tonicella insignis
Tonicella lineata
Tonicella undocaerulea:  See Tonicella lineata
Toxocidaris franciscana: See Mesocentrotus franciscanus
Transparent isopod:  See Idotea resecata
Transparent sea squirt:  See Corella inflata
Transparent tunicate:  See Corella inflata
Tresus capax
Trichotropidae (Family):  See Family Capulidae
Trichobranchidae (Family)--Key
Trichotropis cancellata
Triopha carpenteri:  See Triopha catalinae
Triopha catalinae
Tritella pilimana
Tritonia diomedea
Tritonia exculans:  See Tritonia diomedea
Trochidae(Family)--Key
Trochus divaricata: See Lacuna vincta
Trumpet sponge:  See Stylissa stipitata
Tubedwelling anemone:  See Pachycerianthus fimbriatus
Tube-dwelling pea crab:  See Pinnixa tubicola
Tubeworm hermit:  See Discorsopagurus schmitti
Tubulanus polymorphus
Tunicates:  See Class Ascidiacea
Turbellaria (Class)--Key
Twospine crangon:  See Neocrangon communis
Two-spot keyhole limpet:  See Fissurellidea bimaculata
Two-spotted ribbin worm:  See Amphiporus bimaculatus

U
Ubiquitous brittle star:  See Ophiopholus aculeata
Ugly clam:  see Entodesma navicula
Unstable limpet:  See Lottia instabilis
Unstable seaweed limpet:  See Lottia instabilis
Upogebia gill isopod: See Orthione griffenis
Upogebia pugettensis
Urchins:  See Class Echinoidea
Urechis caupo
Urochordata (Subphylum)
Urticina columbiana
Urticina coriacea
Urticina crassicornis
Urticina lofotensis
Urticina piscivora
 

V
Valvifera (Suborder)--Key
Variable lacuna:  See Lacuna variegata
Variegate lacuna:  See Lacuna variegata
Variegated amphissa: see Amphissa versicolor
Variegated chink shell:  See Lacuna variegata
Variegated limpet:  See Tectura persona
Varnish clam:  See Nuttallia obscurata
Veiled chiton:  See Placiphorella velata
Velcro star: See Stylasterias forreri
Velella velella
Velutina prolongata
Velutinidae (Family)--Key
Veneridae (Family)--Key
Venerupis philippinarum
Venerupis staminea:  See Leukoma staminea
Vermilion sea cucumber:  See Cucumaria miniata
Verrill's ribbon worm:  See Micrura verrilli
Volcano limpet:  See Diodora aspera
Vosnesenski's isopod:  See Idotea wosnessenskii

W
Wandering ribbon worm:  See Paranemertes peregrini
Warty tunicate:  See Pyura haustor
Washington Clam:  See Saxidomus gigantea
Water jellyfish:  See Aequorea victoria
Webbed star:  See Patiria miniata
Wentletrap:  See Family Epitoniidae
Western banded tegula:  See Tegula eiseni
Western bittersweet shell: See Glycymeris septentrionalisWestern white slipper snail (shell):  See Crepidula perforans
Wide lacuna:  See Lacuna vincta
Whale barnacle: Several species, including Coronula diadema
White and orange-tipped nudibranch: See Janolus fuscus
White-banded bobbit worm:  See Eunice valens
White berthella:  See Berthella chacei
White bubble snail:  See Haminoea vesicula
White buckshot barnacle:  See Balanus glandula
White cap limpet:  See Acmaea mitra
White knee hermit:  See Pagurus dalli
White knight dorid:  See Doris odhneri
White knight nudibranch:  See Doris odhneri
White-lined chiton:  See Tonicella insignis
White-lined Dirona: SeeDirona albolineata
White night doris:  See Doris odhneri
White sea cucumber:  See Eupentacta quinquesemita
White-spotted anemone:  See Urticina lofotensis
White-spotted dendronotid: See Dendronotus albopunctatus
White-spotted rose anemone:  See Urticina lofotensis
White wentletrap:  See Epitonium tinctum
Widehand hermit crab:  See Elassochirus tenuimanus
Wine-plumed dorid:  See Acanthodoris nanaimoensis
Wine-plumed spiny doris:  See Acanthodoris nanaimoensis
Wrinkled amphissa:  See Amphissa columbiana, Amphissa versicolor
Wrinkled dove shell:  See Amphissa columbiana
Wrinkled clam:  see Entodesma navicula
Wrinkled purple:  See Nucella lamellosa
Wrinkled seapump:  See Pyura haustor
Wrinkled sea squirt:  See Pyura haustor
 

X
Xanthidae (Family)--Key
 

Y
Yellow boring sponge:  See Cliona californiana
Yellow-edged cadlina:  See Cadilina luteomarginata
Yellow-green creeping tunicate:  See Perophora annectens
Yellowleg pandalid:  See Pandalus tridens
Yellow social tunicate:  See Perophora annectens
Yellow zoanthid:  See Epizoanthus scotinus
Yoke-bearer calcareous tubeworm: See Crucigera zygophora
Yoldia cascoensis: See Yoldia myalis
Yoldia myalis
Yoldia scissurata:  See Yoldia seminuda
Yoldia seminuda
Yoldiidae (Family)--Key

Z
Zebra leafslug:  See Phyllaplysia taylori
Zirfaea pilsbryi
Zirphaea gabbi:  See Zirfaea pilsbryi
Zirphaea pilsbryi:  See Zirfaea pilsbryi
Zoantharia (Subclass)--Key
Zoanthid:  See Epizoanthus scotinus
Zoanthidea (Order)--See Epizoanthus scotinus
Zoned cerith:  See Batillaria attramentaria

Salish Sea Invertebrates web site provided courtesy of Walla Walla University