Re: Mexichromis from Sagami Bay, Japan

August 11, 2001
From: Bernard Picton

Hi Bill,
Concerning Nishina's Mexichromis from Japan I was looking at Orr's book again, while going through my Hong Kong files. He has a picture identified as Chromodoris festiva (Angas, 1864) which clearly shows a broken yellow line around the margin. Given that a number of warm temperate species do occur both in SW Australia and Hong Kong/Japan I wonder if M. festiva really is present also in the NW Pacific.
Bernard

bernard.picton.um@nics.gov.uk

Picton, B.E., 2001 (Aug 11) Re: Mexichromis from Sagami Bay, Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5038

Dear Bernard,
John Orr's photo certainly has similarities to both M. festiva and M. mariei. I certainly have no objections to a species from New South Wales also occurring in the NE Pacific. Interestingly I suspect the apparent disjunct distribution which seemed to exist between southeastern temperate Australia and Japan for a number of species, including Kaloplocamus acutus, Hypselodoris maritima, Stilger smaragdinus, Sagaminopteron ornata etc, is now being shown to represent a disjunct distribution of opisthobranch workers. As more collecting takes place in the tropical regions in between, the distribution gaps seem to be disappearing.
Cheers,
Bill Rudman

Rudman, W.B., 2001 (Aug 11). Comment on Re: Mexichromis from Sagami Bay, Japan by Bernard Picton. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5038

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