Chromodoris geometrica and sponge

September 4, 2007
From: Kenneth Yong

Dear Bill,

In response to your request for photos showing the aggregation of C. geometrica and their vicinity to a purplish-brown sponge, I'm sending a slightly fuzzy photo of a C. geometrica near a blue-gray sponge, taken near the one that was laying eggs. Hope this helps, and thanks a million once again for your help.

Locality: Lang Tengah Island, Nibong Karang divesite, 15 m, Terengganu, Malaysia, South China Sea, 09 July 2007, On vertical face of rocky boulder. Length: 6-7 cm. Photographer: Kenneth Yong

Cordially,
Kenneth

kyong67@tiscali.it

Yong, K., 2007 (Sep 4) Chromodoris geometrica and sponge. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20635

Dear Kenneth,

Blue sponges like this aren't so common, so it is interesting that the C. conchyliolata has been found with a sinilar blue sponge [#14108]. As you will have guessed from other messages the usual food of C. geometrica is the dark purplish Chelonaplysilla violacea, but is is possible that it feeds on another species as well. It's also possible that the nudibranch and the sponge together is just a coincidence, but since a similar sponge has been photographed with a closely related species,  think we should keep a look out for it again.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Sep 4). Comment on Chromodoris geometrica and sponge by Kenneth Yong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20635

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