Amazing dorid from Kerama Id

February 12, 2000
From: Atsushi Ono

Dear Bill,
Thank you for ID of Colpodaspis thompsoni. And thank you Dr.Clay Carlson for ID of Ventomnestia villica.

Here are beautiful, strange dorid species.
I found this species 3 individuals on a reef at about 5m depth [at Kerama Is. near Okinawa in Japan]. These photos are of the same individual, 13mm long. The smallest, probably a juvenile, was 4mm long.

This species has a soft body, a rise in the back like a embankment. I'm sorry I can't write this complicated body shape accurately in English.

I think this is DORIDACEA species.
Could you help me to identify this?

Atsushi Ono

Ono, A., 2000 (Feb 12) Amazing dorid from Kerama Id. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Atsushi,
What an interesting looking animal. I've included your photo of the small 4mm specimen here. Yes it is a dorid, but I can't say much more. In shape it looks to me quite like an Actinocyclus or Hallaxa with its 'goblet-shaped' cluster of gills. The patterning on its mantle suggest its mimicking a sponge.

If it does belong to one of those genera, perhaps Terry Gosliner, who has reviewed Hallaxa has some ideas.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 12). Comment on Amazing dorid from Kerama Id by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Hallaxa hileenae

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