Risbecia tryoni - what's in its mouth?

August 18, 2007
From: Elien Nijland

We took this picture at Raja Ampat and would like to know what is sticking out of its mouth

Locality: Island, 6 metres, Raja Ampat, Indonesia, South Pacific, 20 June 2007, sandy rock. Length: 40 mm. Photographer: Elien Nijland.

Elien Nijland

elien_nijland@planet.nl

Nijland, A.L., 2007 (Aug 18) Risbecia tryoni - what's in its mouth?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20470

Dear Elien,
It looks like a crab. I am not an expert on crabs but it reminds me of a pinnotherid crab which are a group of commensals living in the mantle cavity of large bivalves and the tubes of other invertebrates. However, I don't know of one living in sponges, which are the food of Risbecia. Unless someone has a better idea I think how it got in the nudibranch's mouth will remain another of life's little mysteries

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Aug 18). Comment on Risbecia tryoni - what's in its mouth? by Elien Nijland. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20470

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