Re: Thuridilla from Hachijo Island, Japan

May 18, 2002
From: Shouichi Kato

Dear Bill,
Thank you for your reply about my Thuridilla.
I'm very interested in it and I tried to find the animal intermediate in colour between that light colored animal (A) and 'typical' T. livida (B). Unfortunately I haven't found it yet, but type B can be seen commonly during begining of Spring and Summer at shallow reef. I attached the picture of type B, usually very small, max 15mm in size. But type A was quite larger than type B, around 25mm in size.
And more, it can't be seen clearly in my picture, type A doesn't have orange line but their background is wholly orange.
I wonder if type A and type B are different species.

Thanks and best regards,
S. Kato

Kato, S., 2002 (May 18) Re: Thuridilla from Hachijo Island, Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Shouichi,
Thanks for these photos of typical Thuridilla livida. I am sure you are right in thinking that your light coloured animal is a different species. What I was suggesting is that it is always worth having a look to see how much colour variation you can find. Sometimes we do find a species that is so variable in colour that we can be mistaken into thinking that different variants are different species.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (May 18). Comment on Re: Thuridilla from Hachijo Island, Japan by Shouichi Kato. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Thuridilla livida

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