December 4, 2002
From: Nishina Masayoshi
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.
Masayoshi, N., 2002 (Dec 4) Re: Cratena cf. affinis from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8543
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.
Cratena affinis? from South Africa
From: Colin Ogden, October 26, 2006
Rhinophore shape of Cratena cf. affinis
From: Nishina Masayoshi, December 17, 2002
Cratena affinis from The Japan Sea
From: Shigeru Hayashi, July 27, 2002
Cratena affinis from Hachijo Is., Japan
From: Rie Nakano , July 13, 2002