Flatworm from Kerama Island, Japan

June 25, 1999
From: Atsushi Ono

Dear Bill,
Could you help me with another opisthobranch from Kerama Island, near Okinawa.

Is this an opisthobranch? Aglajidae? 2.5m depth, 3mm length, in April, 1999.
This animal moves speedily.

Sincerely,
Atsushi Ono

ononini@cosmos.ne.jp

Ono, A., 1999 (Jun 25) Flatworm from Kerama Island, Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/974

Dear Atsushi,
The clue to this animal is your comment that it 'moves very speedily'. It's usually a good sign that the animal is a flatworm not an opisthobranch. It is an acoel flatworm. Sometimes they occur in very large numbers on their preferred food, sometimes a soft-coral, sponge or large coral colony.

I suspect that these are the type of flatworm that species of Chelidonura feed on.
Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Jun 25). Comment on Flatworm from Kerama Island, Japan by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/974

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