Ceratosoma sinuatum from the Philippines

April 7, 2008
From: Carlos Munda

Can you please help me identify this Halgerda? The photo was taken by a firend of mine near Samal Island.

Locality: Malipano, Samal Island, 30 feet, Philippines, Davao Gulf, 06 October 2007, Muddy. Photographer: Felix.

Carlos Munda


Munda, C., 2008 (Apr 7) Ceratosoma sinuatum from the Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20963

Dear Carlos,
This is a very nice photo of Ceratosoma sinuatum. The body certainly looks a bit like a species of Halgerda but it is a species of Ceratosoma. Species of Ceratasoma have the bright colours of the chromodorids, but a much tougher outer body wall, more lie that found in Halgerda. I have included a number of close-ups of parts of Felix's photo because it shows a very interesting sponge colony which could well be the food of this species. The arrangement of the fibres in the sponge suggest it is a dysideid, which some other species of Ceratosoma feed on, but the large siphon-like out-growths all over the colony are very unusual. I will have to pass this on to a sponge expert for comment.

This is the first indication we have of a food sponge for this species so even though I can't instantly identify it it is a valuable first step.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Apr 7). Comment on Ceratosoma sinuatum from the Philippines by Carlos Munda. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20963

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