Re: Chromodoris geminus from Thailand

November 28, 2006
From: Asther Lau

Concerning message #18514:

Hello Bill!

Thank you for the reply & confirmation. Attached herewith is another Chromodoris geminus found on the same dive few minutes after the 1st one. As you can see from the photo [lower right], nearby was a Chromodoris annulata.

Locality: Bida Nok Rock, Phi Phi Island, Approx. 10 metres, Phuket, Thailand, Andaman Sea, 4th Jan 2006, Wall covered with softcorals & silt.. Length: About 5 cm. Photographer: Asther M. Lau.

Regards,
Asther

asther@astherlau.com

Lau, A, 2006 (Nov 28) Re: Chromodoris geminus from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/18575

Dear Asther,
As well as posting your whole photo I have also posted some enlargements to show patches of a rather interesting dull blue sponge. When I see two chromodorids together like this my first thought is why are the both in the same spot? I know chance is the easiest answer, but it is also worth checking for other reasons.

Then I noticed that all over the oyster they are crawling on there are patches of a blue sponge. I am not sure if these patches are individual colonies or the remains of a large colony which is being systematically eaten by these two nudibranchs. Interestingly, we do not know what sponges these two species of Chromodoris feed on but their closest relatives feed either on Chelonaplysilla violacea or an unidentified dark blue sponge. I can't be sure from your photo, but I wouldn't mind betting that this dull dark blue sponge is the food of these chromodorids. It is certainly worth adding to your list of things to look out for. 

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Nov 28). Comment on Re: Chromodoris geminus from Thailand by Asther Lau. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/18575

Factsheet

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