Chromodoris geometrica from Cebu

April 3, 2007
From: Dr. Christine Meier

Dear Bill,
We found this nudibranchs during a wall dive at Cebu, Philippines. Looks like a mixture between a Phyllidiidae and a Chromodorididae, but I never have seen a similar before.
Can you kindly identify it?

Locality: Dive site: Pescador Island, about 20 m, Cebu, Moalboal, Phillipines, Pacific, 04 March 2007, carol reef, wall. Photographer: Tine Meier.

Thanks & best regards,
Tine and Schade

 

tinemeier@web.de

Meier, T.S., 2007 (Apr 3) Chromodoris geometrica from Cebu. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19783

Dear Tine,
This is Chromodoris geometrica, and as you say, it is quite a good phyllidiid mimic. Have a look at the mimicry Fact Sheet for some more examples of phyllidiid mimics. The dark sponge your animal is on is quite intersting as I suspect it is its usual food sponge Chelonaplysilla violacea. Usually this sponge has a rougher appearance than in you photo due to the incorporation of sand grains into its outer skeleton. It also does not usually have the yellowish tinge either. It is also possible that the dark purple Chelonaplysilla is overgrowing a yellow sponge. We still have much to learn about sponge growth forms and colour variation as well. This is an interesting addition to our knowledge of the species

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Apr 3). Comment on Chromodoris geometrica from Cebu by Dr. Christine Meier. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19783

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