Unknown Chromodoris from Japan

August 31, 2001
From: Nishina Masayoshi

Dear Dr.Rudman,

I found this animal at Echizen, Japan where it appears to be very common at Echizen beach, but I've never seen this and could not find it in my ID book or any web site that I know.
It's looks like a Chromodoris, and from its body shape it looks like a
Chromodoris tinctoria. But this animal has pale pink rhinophores, gills and marginal band.
And color pattern on the back is not familiar for me.

Place: Echizen Beach, Japan.
Day: 17th July, 2001
Depth: 5m
Water Temp: 25C degree
Size: 30mm-40mm

Best Regards,
Nishina Masayoshi

nishina@hp15.wips.co.jp

Nishina, M., 2001 (Aug 31) Unknown Chromodoris from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4910

Dear Nishina,
In an earlier message you sent some photos of some pale specimens of Chromodoris tinctoria. I suspect these are even paler examples. The colour pattern fits well, but what is missing is most of the red pigmentation, leaving a pale pink pattern wherever red would normally be. And what about the yellow border? You will note in your earlier photos that the border was a very pale pinkish orange - not that different to the pink colour in these photos. We just don't know enough about pigmentation in nudibranchs to know how bright yellow pigment is produced. Perhaps it requires the same molecules as are needed to form bright red. My considered guess is that this is a peculiar colour form of C. tinctoria.

Whatever it is, thanks again for another interesting contribution.
Best wishes,
Bill Rudman.

Rudman, W.B., 2001 (Aug 31). Comment on Unknown Chromodoris from Japan by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4910

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