Cuthona yamasui from Borneo

July 11, 2003
From: Makoto Uesugi

Hello Dr.Rudman,

Nice to meet you. I found this species at Satang Besar Island, NW Borneo.

I think this is a species of Cuthona sp. but, I can’t identify it. Can you help pleas?

Date: 21 May 2003
Location: Satang Besar Island, Sarawak, Malaysia
Depth: 2m
Length: about 3cm
Photo by Makoto Uesugi

Best Regards
Makoto Uesugi

Uesugi, M., 2003 (Jul 11) Cuthona yamasui from Borneo. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Makoto,
It is nice to get more photos of this species as it is giving us a good idea of it colour variation. It is Cuthona yamasui. This species seems to live only on the stinging hydroid Aglaophenia cupressina, which, from your photo is where you found this animal.
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jul 11). Comment on Cuthona yamasui from Borneo by Makoto Uesugi. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cuthona yamasui

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