Mexichromis from Sagami Bay, Japan

August 8, 2001
From: Nishina Masayoshi

Dear Dr.Rudman,
Here is a photo of Mexichromis that Chikako took on 7th July, 2001 at Enoura beach, Sagami Bay, Japan.

Depth: 5m
Size: 25mm
Comment: Rare here, but confirmed that Mexichromis festiva is here.

Best Regards,
Nishina Masayoshi

nishina@hpe15.wips.co.jp

Nishina, M., 2001 (Aug 8) Mexichromis from Sagami Bay, Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4940

Dear Nishina,
If you look at my comments on the various species of Mexichromis on the Forum you will see that we are still a bit confused about the species of this group.

Your animal is clearly the same as the one that Baba (1989) identified as Mexichromis festiva but it is quite unlike typical M. festiva from Sydney Harbour, which lacks the pointed tubercles o the mantle and has a mantle margin consistig of a series of elongate spots rather than an entire line. I think the best place for your photo at the moment is Mexichromis mariei but the closely spaced pointed tubercles on the mantle are unusual. Any information and photos of the sponge it feeds on and its egg ribbon would be very valuable.

• Baba, K (1989): More study on two species of Mexichromis from Japan (Nudibranchia: Chromodorididae). Venus, The Japanese Journal of Malacology, 48(1): 12-20.

Best wishes,
Bill Rudman.

Rudman, W.B., 2001 (Aug 8). Comment on Mexichromis from Sagami Bay, Japan by Nishina Masayoshi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/4940

Factsheet

Mexichromis mariei

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