Opalescent Sea Slug

Hermissenda crassicornis

''Hermissenda crassicornis'' is a species of small, brightly colored, sea slug or nudibranch, a marine gastropod mollusk in the family Facelinidae.

This species is also commonly known as the "opalescent sea slug."
Opalescent Nudibranch This is an opalescent nudibranch, a very small but beautiful creature. This one lives under the dock at the marina. Canada,Geotagged,Hermissenda crassicornis,Summer,nature,sealife,underwater

Appearance

The species grows to be about 50 mm, or about 2 inches. The color of this nudibranch varies from one locality to another, but it is always easily recognizable by the orange stripe along its back.

It is often confused with the Caloria Indica, though differs from it by the having a larger number of branches, creating a dense, fur-like pattern.

This slug has been also used in several studies about Beta thymosins.

Distribution

This nudibranch lives from Kodiak Island, Alaska, to Punta Eugenia, Mexico.

The species has also been observed in Bahia de los Angeles, Gulf of California, and in Japan and along the South East Indian Coast.

Habitat

It can be found in various habitats, including the intertidal zone of rocky shores, but also in bays and estuaries.

References:

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Taxonomy
KingdomAnimalia
DivisionMollusca
ClassGastropoda
OrderNudibranchia
FamilyFacelinidae
GenusHermissenda
SpeciesH. crassicornis
Photographed in
Canada