Re: Green Nudibranch

February 24, 2001
From: Timothy Loyd

Thanks for the I.D. One question though; Can this species reach lengths of 10cm or greater? Since I sent the last message I have spotted more nudibranchs. I believe the other species are Elysiella pusilla (flat variety). I have become curious how a nudibranch at any stage of developement could survive 2-3 days on or in a piece of live rock wrapped in wet newspaper. I would be interested in any thoughts you might have on this subject. Thanks Again,
Tim

tim@aquaticconnection.com

Loyd, T., 2001 (Feb 24) Re: Green Nudibranch. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3858

Dear Tim,
From your reply are you telling me your animal was more than 10cm long? If so, you may have Bursatella leachii, which looks quite like Stylocheilus striatus, but is normally not as elongate as in your photo. However I can't really be sure from your photo. The largest S. striatus I know of are some specimens I collected in Zanzibar. They were about 65mm long. So if your animals are more than 100mm long you either have a new size record for Stylocheilus striatus or you have something else.

Concerning your other slugs. I guess its possible you have Elysiella pusilla but that species seems to be restricted to the jointed calcareous alga Halimeda. Have you that growing on your 'live rock'. Otherwise you may have a species of Elysia. How do they survive the trials of being transported halhway around the world on a rock wrapped in damp newspaper. I suppose I could make a joke about the quality of the articles in the paper, but I will restrain myself. Very small slugs, and other marine invertebrates for that matter, can survive for some time out of water, as long as they are kept damp. If they remain moist they are still able to breathe through their skin at least for a few days, and they are probbaly protected from crushing by being in a small hole or crevice in the rock. As long as there is some appropriate food on the rock once they are unwrapped and placed in an aquarium, they will recover and grow quite quickly. I would suspect that the animals you are seeing now almost certainly arrived on your rock as small juveniles.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Feb 24). Comment on Re: Green Nudibranch by Timothy Loyd. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3858

Factsheet

Stylocheilus striatus

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