Another photo of Noumea subnivalis

August 21, 2001
From: Nishina Masayoshi

Dear Dr.Rudman,
I found this photo on a Japanese website and the photographer Mr T. Kenji is pleased to give his permission for his photograph to be carried by the Forum if these are of N. subnivalis and useful.

Date:1 July,2001
Location: Omijima, Yamaguchi Prefecture
Yamaguchi Prefecture is located in the southernmost tip in Honshu (Main island of Japan). Depth:6M
Found by M. Fumiko
Photo by T. Kenji

Best Regards,
Nishina Masayoshi

Nishina, M., 2001 (Aug 21) Another photo of Noumea subnivalis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Nishina,
Thanks very much for this photo. I'm glad now that the first photo of N. subnivalis that Yasuhiro Shirai sent us was so difficult to identify. The discussion that has followed has meant we now have a number of good photos of this species and a much clearer understanding of the differences between it and Chromodoris verrieri and Noumea nivalis.

In this photo it is interesting to see how the mantle forms a fold on each side when the animals are not moving and 'nestled'. Quite a few species of Noumea assume this position when at rest. Another interesting point is why they cluster together like this? The three on the left are all facing the same way, so this clustering is not a mating position. Perhaps they are attracted together by pheromones, or by following mucus trails, or perhaps they are clustered on a small colony of their preferred food sponge.
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Aug 21). Comment on Another photo of Noumea subnivalis by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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