Big purple-footed nudibranch from Singapore

June 28, 2006
From: Ron Yeo

Hi Bill,

Found this big fat nudibranch on an islet which is only exposed during very low tides. The islet is located near an island called Pulau Tekong in Singapore.

Locality: Beting Bronok, Singapore, Singapore, South China Sea, 25 June 2006, Intertidal. Length: 15 cm. Photographer: Ron Yeo.

Would really appreciate it if you can assist to identify it.

Ron Yeo

Yeo, R, 2006 (Jun 28) Big purple-footed nudibranch from Singapore. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Ron,

The dark purple foot and underside of mantle, and the rows of dark brown spots on the upper side of the mantle, are all good indications of Atagema spongiosa. I have never found two very large animals together like this, but as you no doubt noticed, they are very well camouflaged in their natural environment, so are probably often overlooked.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Jun 28). Comment on Big purple-footed nudibranch from Singapore by Ron Yeo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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