Hydatina physis from Japan

June 11, 2003
From: Kayoko Eto


Dear Bill,
I found these Hydatina physis copulating at Osezaki beach in Japan. I observed then until they finished.

Could you tell me what the object in the third [lower] photo is please?

Data:
Date: 4 June,2003
Location: Osezaki beach, Suruga Bay, Pacific coast of Japan
Depth: 2m
Length: 10cm×2
W/temp: 20 C degree
Photo by Kayoko Eto

Best Regards,
Kayoko Eto

kame@diving.to

Eto, K., 2003 (Jun 11) Hydatina physis from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10187

Dear Kayoko,
I don't think the feathery object is part of the Hydatina. Could it possibly be a fish scale or something similar that has got stuck on the edge of the foot? I have dissected a few of these animals over the years and I can't recall any organ that looks like this, so I can only guess that it's something from the sand that has got stuck on the foot.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jun 11). Comment on Hydatina physis from Japan by Kayoko Eto. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10187

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