Distribution. These two species can be distinguished by their cerata: the more northern H. crassicornis has a white stripe in each ceras, whereas the more southern H. opalescens doesn't. Identification description of opalescent nudibranch (Hermissenda crassicornis) * Fun fact! Thanks sgain.I found one that was about an inch and a half in the burrard inlet off the coast of bcFill in your details below or click an icon to log in:Enter your email address to follow this blog and receive notifications of new posts by email. In 1922 O’Donoghue concluded that Hermissenda opalescens (Cooper, 1863), originally described from San Diego, California was a junior synonym of H. crassicornis, originally described from Sitka, Alaska, and this opinion became universally accepted [23, 25]. The tips contain the stinging cells (nematocysts) of the nudibranch’s prey e.g. The colour of the cerata in BOTH species can vary from light brown to dark brown to bright orange. See Cerata are the structures on some sea slugs species’ backs that have both a respiratory and defence function. I am so glad you asked as I totally nerded out and made a summary table to differentiate the 3 species reported in the research “The table is just for you my fellow nudibranch nerds.But, I’ll cut to the conclusion. It is replaced by Hermissenda opalescens to the south of Northern California. ©Jackie Hildering.Hermissensa crassicornis feeding on Pink-Mouth Hydroids. Don’t be fooled by the colour of the two species found in the Northeast Pacific Ocean. These cerata are white and orange — the amount of each colour  from just a little orange at the tip, to nearly entirely orange — with a bright white stripe running the length of each ceras*. Sorry, your blog cannot share posts by email. Thereby, I anticipate this beautiful species will keep on being referenced as the “Opalescent Nudibranch” in the vernacular.What are the differences between these two species? This nudibranch was described from San Diego, California, United States. The species on the right is being referenced as the “Opalescent Nudibranch” (reinstating the species name However, off British Columbia’s coast we are only likely to see the species on the left with its range being from Alaska to Northern California. Here you can very clearly see the distinctive white lines on the cerata. This colourful nudibranch's furry appearance is due to the many long, thin (fingerlike respiratory projections) that project from its back translucent whitish back (. A 2016 study found that what was previously called H. crassicornis along both sides of the Pacific Ocean (Alaska to Baja California in the northeast, and Russia and Japan in the northwest) is actually a species complex, with one species in the northwest and two in the northeast, overlapping in Northern California. Hermissenda opalescens ist in Rockpools, in der Gezeitenzone, aber auch an felsigen Ufern, Buchten und Flußmündungen zu finden. It has been reported from Northern California, to Punta Eugenia, Mexico. Die Fadenschnecke ernährt sich von verschiedenen Hydrozoen, Anemonen und Seescheiden.Die hübsche Fadenschnecke ernährt sich auch kanibalisch von jungen Schnecken der eigenen Art. I never come near your site without leaving with a whole lot of new information. The easiest way to distinguish crassicornis from opalescens is the longitudinal white stripe on the cerata of crassicornis, while the cerata of opalescens have white tips but no white stripe. As a result of making the following post on social media, I learned that there has been a change in classifying the “Opalescent Nudibranch”.As you can see, the species on the left is more similar to the one I posted and which we call the “Opalescent Nudibranch” in British Columbia.This has of course led to the need for two common names to differentiate them there. Habitat. There is usually a  running along the centre of the back and bordered by two bright blueish-white lines, though colours may vary and the orange line may be absent. Hermissenda vs. Corynactis August 3, 2007 From: Bruce Wight Came across what appeared to be a Corynactis californica feeding on a Hermissenda crassicornis.After a few minutes the struggle was over and the Hermissenda crawled away leaving a few cerata behind.. More recently the Japanese species Cuthona emurai Baba, 1937 was synonymized with H. The species on the right is being referenced as the “Opalescent Nudibranch” (reinstating the species name Hermissenda opalescens). Hermissenda crassicornis from British Columbia.


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