Hermissenda crassicornis

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Hermissenda crassicornis
Nudibranchia (3560037731).jpg
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia

clade Euthyneura
clade Nudipleura
clade Nudibranchia
clade Dexiarchia
clade Cladobranchia
clade Aeolidida

Superfamily: Aeolidioidea
Family: Facelinidae
Genus: Hermissenda
Species: H. crassicornis
Binomial name
Hermissenda crassicornis
Eschscholtz, 1831

Hermissenda crassicornis is a species of brightly coloured, sea slug or nudibranch, a marine gastropod mollusc in the family Facelinidae.[1]


This nudibranch lives from Kodiak Island, Alaska, to Northern California. It is replaced by Hermissenda opalescens to the south of Northern California.[2]


This species is found in various habitats, including the intertidal zone of rocky shores, but also in bays and estuaries.


The species grows to be about 50 mm, or about 2 inches. The colour of this nudibranch varies from one locality to another, but it is always easily recognizable by the orange stripe along its head area and the white stripes on the cerata.[3]

Life habits[edit]

This nudibranch feeds on hydroids and other marine organisms such as ascidians and sea anemones. It sometimes attacks other nudibranchs, and will eat smaller specimens of its own species.


  1. ^ Rosenberg, G. (2011). Hermissenda crassicornis (Eschscholtz, 1831). Accessed through: World Register of Marine Species on 2012-06-03
  2. ^ Lindsay, T. & Valdés, Á. (2016) The Model Organism Hermissenda crassicornis (Gastropoda: Heterobranchia) Is a Species Complex. PLoS ONE 11(4): e0154265.
  3. ^ Thomas, C., 2007 (Apr 4) Colour variation in Hermissenda crassicornis. [Message in] Sea Slug Forum. Australian Museum, Sydney.