Feeding Risbecia tryoni from Borneo

May 16, 2007
From: Richard Swann


Hello Bill

I couldn't help but post this feeding record of Risbecia tryoni. It was taken on the same sponge colony as the Hypselodoris kanga I recently posted [message #19897] (still there feeding by the way) in fact within a couple of square feet we have Mexichromis multituberculata, H. kanga and R. tryoni all feeding on the same sponge.

Locality: Mamutik island,Kota Kinabalu, 11meters, Sabah, Borneo, South China Sea, 15 May 2007, sheltered reef. Length: Approx 40mm. Photographer: Richard Swann.

The partner shrimp just adds to this wonderful banquet it rather reminds me of a cat sitting on your head eating from your dinner plate. The first photo shows some of the colony in the background.

I have only ever seen one partner shrimp on a Nudi before is this very rare ?

Best regards
Richard
www.downbelow.co.uk

richard@downbelow.co.uk

Swann, R., 2007 (May 16) Feeding Risbecia tryoni from Borneo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19916

Dear Richard,
As I am sure you realise, I can't get enough of the these feeding records. These photos illustrate another point I have made regularly about the problems in catching these animals feeding whe often their sponge food is hidden under an overgrowing layer of either plant or animal - or in this case, a temporary layer of sediment which is entangled in a mucous sheet produced by the sponge. If it weren't for the 'feeding scars' where they have bitten through the sediment layer, we would have no idea that a large sponge colony lay beneath. This sponge, a species of Dysidea, is the only sponge we have found this species eating.

It is fascinating to see the 'partner shrimp' Periclimenes imperator ' apparently benefitting from its partnership. It is quite common on many large sea slugs. If you do a search on the Forum for Periclimenes you will get a long list of records of it on various species.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (May 16). Comment on Feeding Risbecia tryoni from Borneo by Richard Swann. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19916

Factsheet

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