Placida? from Japan

February 16, 2000
From: Yasuhiro Shirai

Dear Bill,
Thank you for your quick reply to my last question. I found this opisthobranch at Shima.
This opisthobranch crawled on Colpomenia sinuosa.
Could you please identify this animal for me.

Data:
Location: Shima Pref. Mie Japan (Kii Peninsula east coast)
Length: 2.5mm
Water temperature: 13C
Date Jan. 2000
Depth: 3m
Crawling on seaweed Colpomenia sinuosa.

Best regards,
Yasuhiro Shirai

yasuhiro@e-net.or.jp

Shirai, Y., 2000 (Feb 16) Placida? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1897

Dear Yasuhiro,
When I read that you found this on Colpomenia it made me wonder whether you had a species of Costasiella because I have found one living on Colpomenia. However in that genus the eyes are very close together and that doesn't seem to be the case in your species.

I think your animal is one that is usually called Hermaea dendritica or Placida dendritica. I am afraid there is considerable debate worldwide about whether there is one worldwide species or a number of similar regional species. See Cynthia Trowbridge's message suggesting there are many regional species at present being erroneously identified as Placida dendritica.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 16). Comment on Placida? from Japan by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/1897

Factsheet

Placida dendritica?

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