Thuridilla livida from the northern Marianas

November 15, 2005
From: Takao Urasawa

Dear Dr Rudman

Is this Thuridilla hoffae?

Locality: Wing beach, Saipan, Northern Mariana Islands. Depth: 12 m. Length: 20 mm. on the coral. Photographer: Takao Urasawa

Takao Urasawa

Takao Urasawa, 2005 (Nov 15) Thuridilla livida from the northern Marianas. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Takao,
This is Thuridilla livida. Both this species and T. hoffae are reported from the Mariana Ids, but T. livida has a more colour bands at the mantle edge. Gosliner (1995) describes the parapodia to be bordered with a series of lines - "The innermost line is black followed by lines of orange, black and bright blue..." I can only assume he means the outermost not innermost line is black, as in your photo the order of the lines is reversed..
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 15). Comment on Thuridilla livida from the northern Marianas by Takao Urasawa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Thuridilla livida

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