Roboastra arika? from Similan Thailand

March 12, 2007
From: Napas Golf

Dear Bill,

Is this Roboastra arika?. It has tri-colours, different from the book and from others I had found. The second picture is from Komodo).

Locality: Upper photo: Similan Island, 20 m, Thailand, Andaman Ocean, 14 Feb 2007, Wall. Length: 1.5 inches. Lower photo: Komodo Island, Indonesia. Photographer: Napas Golf.

Best regards,

Napas Golf, 2007 (Mar 12) Roboastra arika? from Similan Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Golf,

The animal Bob Burn described as Roboastra arika is almost certainly a synonym of R. gracilisUnfortunately Burn based his description on a preserved specimen which had no accompanying photo. The animal which has been mistakenly identified as Roboastra arika in the popular literature, is in fact a species of Tambja, which has recently been named Tambja victoriae. From photos such as yours, we can say that this species is quite variable in colour.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Mar 12). Comment on Roboastra arika? from Similan Thailand by Napas Golf. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Tambja victoriae

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