Description:
Body
usually 25-75 mm, but can reach 260 mm. Bright orange to
light
yellow
or sometimes white. Nudibranch has dark markings between but
not
on the tubercles (photo).
Has finger-shaped
oral tentacles, and gills numbering six. This species may
produce
a lot of sweet, fruity-smelling mucus (photo)
when disturbed. Its gills and rhinophores
are usually lighter in color than is the dorsum (photo).
Gills are white-tipped and may be entirely white.
How to Distinguish from
Similar
Species: Doris
montereyensis has dark markings both on and between
the tubercles,
plus does not produce much mucus or a strong smell. Its gills
and
rhinophores
are usually darker than the dorsum.
Geographical Range: Kodiak Island, Alaska to Isla Coronados (Baja California). Rare in intertidal in southern part of range Depth Range: Low intertidal zone and subtidal to 35m Habitat: Common in low intertidal, on rocky shores, harbor pilings Biology/Natural History: This is the largest of California nudibranchs. It has a penetrating, fruity odor, which may be used to fend off predators. It feeds on a variety of sponges, including Axocielita originalis, Astylinifer arndti, Hymenamphiastra cyanocrypta, Lissodendoryx firma, Halichondria panicea, Haliclona permollis, and species in the genera Mycale, Zygherpa, Parasperella, and Prianos. It may also ingest quantities of organic detritus. Studies show that individual nudibranchs are conservative in their food habits; they tend to keep eating the same food species, even if they are transferred to other sites. Spawning period varies with location, but extend for several months. The mating is reciprocal; partners may be of vastly different size. This species is a simple organism to study the nervous system and thus has been used for much neurophysiological research. Sponges which live on the motile scallop Chlamys hastata are less vulnerable to predation by this nudibranch.
References:
|
Top and side view of a 10.5 cm long individual found subtidally at Rosario, summer 2020. Photos by Dave Cowles |
Authors and Editors of Page:
Robbie Wheeling (2002): Created original page
Edited by Hans Helmstetler 1-2003
Edited by Dave Cowles 2005-