Re: Cratena cf. affinis from Japan

December 4, 2002
From: Nishina Masayoshi

Dear Bill,
As requested, here are some more photos of Cratena affinis - Type C [see earlier message]. I photographed them all at Hachijo Island. None of them were moved from their natural habitat for the photo.
Upper Right: 27 Oct. 2002, Length: 4mm, Depth: 8m
Lower Left: 1 Dec. 2001, Length: 8mm, Depth: 6m
Lower Right: 8 June. 2002, Length: 8mm, Depth: 8m

I am a bit hesitant about the lengths, as they are very thin and small for me to photograph. I suspect these animals and the animal from R. Nakano (and maybe S. Hayashi's too) on your Forum which was sorted as Cratena affinis are probably the same.
Best Regards,
Nishina Masayoshi

Masayoshi, N., 2002 (Dec 4) Re: Cratena cf. affinis from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Nishina,
These photos are a useful addition and the closeup alongside clearly shows the radiating papillae which form the rhinophore 'rings'. However the don't seem so clear in some of the other photos, so it will be worth checking the nature of the rhinophore rings in other specimens of this colour 'form'. I think I'll keep this 'form' or 'species' separate from more 'typical' C. affinis on the Forum. I agree with your suggestion that R. Nakano's and S. Hayashi's photos belong there as well.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Dec 4). Comment on Re: Cratena cf. affinis from Japan by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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