Chromodoris from Perth, Western Australia

March 16, 2000
From: David Freemantle

Dear Bill

Could you please help me identify the nudibranch in the attached photos, taken at the South Mole, Fremantle, Perth, Western Australia on the 12 March 2000 at 6 metres. It certainly has a distinct pattern and there were half a dozen specimens seen at the time, which led me to believe it is common, yet after searching my references for an hour I still could not find anything that looks all that close.

Thanks in advance for your help.
David Freemantle

Freemantle, D., 2000 (Mar 16) Chromodoris from Perth, Western Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Dave,
This is Chromodoris roboi. Your animals seem to have an intermediate colour form between the photo at the top of the page, which is also from Perth, and the more typical spotted form illustrated in various messages on this page. It doesn't seem to be that common anywhere, but your find of a group of animals may reflect a chance settling of a group of larvae. Another alternative is that its food sponge is reasonably rare in Perth, so any settling larvae will be concentrated on one or a few sponge colonies.
Nice photos,
Bill Rudman.

Rudman, W.B., 2000 (Mar 16). Comment on Chromodoris from Perth, Western Australia by David Freemantle. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Chromodoris roboi

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