Re: Chromodoris magnifica from Sulawesi

February 2, 2007
From: Mirjam Broos

Concerning message #19120:

Dear Bill,
Thanks for the identification. It's nice to learn more about sea slugs.I'm quickly becoming a kind of sea slug addict.

We didn't move the animal and found it right there on the grey sponge. Why do you think it is unhappy?

Greetings,
Mirjam Broos

mirjam.broos@planet.nl

Broos, M., 2007 (Feb 2) Re: Chromodoris magnifica from Sulawesi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19322

Dear Mirjam,
Thanks for getting back to me. I guess you get a feel for their 'body language' after studying them for many years but it looks as though I was wrong this time. Certainly the fully extended gills in your photo suggest the animal was relaxed, but often when you put an animal on an unfamiliar or 'uncomfortable' surface it will contract and the foot will not fully expand - which is what your animal seems to be doing.  I need to know beacause I am interested in finding out which sponges the chromodorids feed on, and one method is to make a note of the various sponges each species is actually found on. Although witnessing feeding in process is the only 100% accurate method, finding a nudibranch consistently on one species of sponge is a useful way to get clues about possible food items. But for that to work I have to be sure that photos with a nudibranch on a potential food item are 'real'. I have nothing against 'posed' photos as sometimes it is not possible to take a photo unless you move an animal to a more convenient spot, but it can be misleading, so when I have a doubt, I think it is better to ask.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Feb 2). Comment on Re: Chromodoris magnifica from Sulawesi by Mirjam Broos. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19322

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