Ceratosoma trilobatum from Bali

September 5, 2007
From: Kenneth Yong

Dear Bill,

Is this Ceratosoma trilobatum? Photographed on the wreck of the Liberty, off Tulamben in Bali, it was in movement, crawling along pretty quickly.

Locality: Tulamben, the Liberty Wreck, 12 m, Bali, Indonesia, Java Sea, 28 July 2007. Length: 6-7 cm. Photographer: Kenneth Yong.

Thanks very much,
Kenneth

kyong67@tiscali.it

Yong, K., 2007 (Sep 5) Ceratosoma trilobatum from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20620

Dear Kenneth,

Yes I would call this C. trilobatum. It is possible this reddish spotted form is a link to the animals from the Japanese region which have been given a separate name, Ceratosoma bicolor,  by Baba. In that form the red-orange colouration forms a line or large patch down the dorsal midline.

I have included a close-up of the head because your photo shows the row of white mantle glands along the front edge of the mantle very well. These store distasteful chemicals from the sponges they eat and are used to deter fish from eating them.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Sep 5). Comment on Ceratosoma trilobatum from Bali by Kenneth Yong. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20620

Factsheet

Ceratosoma trilobatum

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