Chromodoris geometrica from Japan

January 26, 2000
From: Yasuhiro Shirai


Dear Bill,
Thank you for your quick reply every time.
This time,I attached 2 files. At first,I thought that this is Chromodoris geometrica but previously I have only seen C. geometrica, in warm seas with coral reefs. But this one was found in cool waters. I don't think C. geometrica has been found around here before now.

What do you think about this one? Could it be a juvenile C. geometrica?

Data:
Location: Shima Pref. Mie Japan (Kii Peninsula east side)
Length: 4mm
Water temperature: 13C
Date Jan. 2000
Depth: 3m
moving on rock wall.

Best regards,
Yasuhiro Shirai
http://www.e-net.or.jp/user/yasuhiro/

yasuhiro@e-net.or.jp

Shirai, Y., 2000 (Jan 26) Chromodoris geometrica from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1785

Dear Yasuhiro,
I am sure your animal is a juvenile C. geometrica. Although they are usually found in warmer water, C. geometrica is also sometimes found in the cooler waters of southern New South Wales, here in Australia. Veliger larvae from tropical waters are sometimes carried into colder regions in warm currents or small eddies of warm water. If the larvae find the right food they can settle and metamorphose into little crawling slugs in quite cool waters. However it is always a risky business and if they or their food sponge can't survive in colder waters then the nudibranch will not grow to adulthood. Perhaps that it why larger specimens are not usually found at Kii Peninsula.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Jan 26). Comment on Chromodoris geometrica from Japan by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1785

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