|Closeup of Hermissenda crassicornis off Monterey, California|
This species is also commonly known as the "opalescent sea slug."
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.
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. It is host to the ectoparasites Halicyclops thysanotus Wilson C.B., 1935 and Hemicyclops thysanotus Wilson C.B., 1935.
- Rosenberg, G. (2011). Hermissenda crassicornis (Eschscholtz, 1831). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=367883 on 2012-06-03
- "Hermissenda crassicornis". The Slugsite. Retrieved 17 April 2006.[dead link]
- Sea Slug Forum, species fact sheet:
- Behrens David W., 1980, ‘’Pacific Coast Nudibranchs: a guide to the opisthobranchs of the northeastern Pacific’’, Sea Challenger Books, California
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