Phidiana indica at Siladen Island

August 29, 2007
From: E. Elvan Ampou

Dear Bill
I just want to asked about this picture of a nudibranch. I took the picture during when diving when i was a student in Master in Knowledge and Management of the Biodiversity of Indonesian Coral Reefs, Polytechnical University of The Marche - Ancona, Italy. Precisely my diving activity at Siladen Island was at Bunaken National Park. I really hope your explanation about this picture because the nudibranch was settled on the sponge. 

Locality: Island, 5 metres, Indonesia, Sulawesi Sea, 17 March 2005, Sponge. Length: 2 inches. Photographer: Ampou, E.E..

Thank you very much for your kind attention.
Best Regards,

Ampou, E.E., 2007 (Aug 29) Phidiana indica at Siladen Island. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Elvan,

Phidiana indica is a hydroid feeder, but it is often seen crawling over other colonial animals such as sponges and corals and also over sea weeds. There is no significance in this, the nudibranch is basically treating these other organisms as a piece of rock or a pathway. You'll note in your photo that there are small crustaceans all over this sponge as well.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Aug 29). Comment on Phidiana indica at Siladen Island by E. Elvan Ampou. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Phidiana indica

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