Thorunna speciosus from Japan

June 9, 2000
From: Atsushi Ono

Dear Bill,

Here is a photo of an animal I think is Thorunna speciosus to compare with the two I think may be colour variations I sent in a separate message.

It is 13mm long and I found them at 5m depth on a coral reef at Kerama Is. near Okinawa in Japan.

Atsushi Ono

Ono, A., 2000 (Jun 9) Thorunna speciosus from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Atsushi,
This is definitely T. speciosus but I don't think the other two photos you sent are colour variations of this species. Even if the orange border could vary to white, in T. speciosus there is always a break in the band on each side at the front of the mantle alongside the rhinophores. In the other animal, which I have tentatively called Thorunna cf. speciosus, there is no break in the white band bordering the mantle.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Jun 9). Comment on Thorunna speciosus from Japan by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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