Atagema spongiosa? from Anilao, Philippines

August 7, 2006
From: Reindert Grooters and Mieke Snoek

Hello Bill,

Can you identify this big nudibranch (about 18 cm measured with my lamp), which we found during a night dive in Anilao. The big blotches on the further smooth skin seems to be characteristic. The color on the foto's are as we remember: red-brownish with white speckles.

Locality: Anilao, Batangas, 7 metres, Philippines, Pacific, 17 November 2005, Sand and coral patches. Length: 18 cm. Photographer: Mieke Snoek.

Reindert & Mieke

Grooters, R. & Snoek, A., 2006 (Aug 7) Atagema spongiosa? from Anilao, Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Reindert & Mieke,

I am pretty sure this isAtagema spongiosa . I at first thought it might be some sort of polycerid from its shape, but I am pretty sure that the gills and rhinophores have pocket into which they can contract. I suspect the mantle has been severely damaged, with most of the edge broken or bitten off. The greenish white patches remind me of Atagema spongiosa, as does its large size, so that is my best guess

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Aug 7). Comment on Atagema spongiosa? from Anilao, Philippines by Reindert Grooters and Mieke Snoek. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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