As with all members
of family Hippolytidae, this shrimp has no exopodites
on its pereopods,
2 is divided into 3-7 units, and it has a rostrum.
Like other members of genus Spirontocaris, this
species has two
or more supraorbital
in the carpus
2, plus the third maxilliped
has an exopod,
and a small chela.
In Spirontocaris lamellicornis the mid-dorsal carapace
teeth do not have small spines on their anterior margins (photo).
The third pereopod
has an epipodite.
The ventral margins of the pleura
of the first five abdominal segments are acute
or with a spine. The dactyls
3-5 have simple but curved tips. The rostrum is deep and
beyond the peduncle
of the first antenna. The rostrum
has 9-23 dorsal teeth including 4-5 on the mid-dorsal carapace,
and 1-3 ventral teeth. Each segment of the peduncle
of the first antennae has a distal spine. The telson
has 4 pairs of dorsolateral spines and an acute
tip. Color pattern variable, often dark brown with pereopods
dark red to colorless. Tail fan is banded (photo),
may be milkish with fine red mottling, yellow and brown or black
Sixth abdominal segments often red to purple (photo).
Male to 4.2 cm long,
female to 6.3 cm.
Common name(s): Dana's blade shrimp, Dana's bladed shrimp
captured from 60-100 m depth in San Juan Channel.
|(Photo by: Dave
Cowles, July 2010)
Recently members of family Hippolytidae which have seven articles
in the carpus
of the 2nd pereopod
have been reassigned to family Thoridae.
How to Distinguish from
Spirontocaris prionota has small spines on the
of its mid-dorsal carapace teeth. Spirontocaris
truncata, S. arcuata, S. spina,
and S. snyderi
have bifid tips on the dactyls of pereopods
Sea to Santa Monica Bay, CA. Mostly north of Point
but some have been found in canyons in Santa Monica Bay.
Subtidal, 3-192 m.
Mostly on sand and mud,
some in rocky areas.
is often found symbiotically with sea anemones including Cribrinopsis
fernaldi and Urticina columbiana.
In the Salish Sea
and coastal British Columbia the species is often infested by the
and Hanby, 2005
General Notes and
abundances, unusual behaviors:
This is frozen specimen about 6 cm long.
Found by Hilary Lease near Friday Harbor.
This closer view of the carapace
shows how deep the rostrum
is and the large mid-dorsal teeth. A frozen individual.
The two supraorbital
spines are visible in this photograph. A
The dactyls of pereopods 3-5 have simple but curved tips.
Photo of live individual by Dave Cowles, July 2010
are often banded with lighter colors. A frozen
This photo of a live individual also shows the banded telson,
plus the red color of the sixth abdominal segment.
Authors and Editors of Page:
Dave Cowles (2009): Created original page
CSS coding for page developed by Jonathan Cowles (2007)
Rosario Invertebrates web site provided courtesy of Walla