Cratena affinis from The Japan Sea

July 27, 2002
From: Shigeru Hayashi

Dear Bill,
Here is a photo of Cratena affinis to help give us a fuller idea of its variation. C. affinis lives in the same environment as C. lineata but is not often found.

Collection data: 13 August 2000. Sado Island. 15mm length.

Yours Sincerely
Shigeru Hayashi
(Takaoka Biological Club)

jr9dsx@tko.fitweb.or.jp

Hayashi, S., 2002 (Jul 27) Cratena affinis from The Japan Sea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7563

Thanks Shigeru,
In Baba's (1949) painting the digestive gland duct is dark brown, almost black, and there are fine white longitudinal lines down the cerata. It would seem that this is one of those species in which the colour of the ceratal digestive gland is determined either by what the animal has just eaten, or whether it has recently eaten.
Bill Rudman

Rudman, W.B., 2002 (Jul 27). Comment on Cratena affinis from The Japan Sea by Shigeru Hayashi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7563

Factsheet

Cratena cf. affinis

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