Chromodoris roboi from southwestern Australia

September 14, 2000
From: Craig Lebens

Dear Bill,
I have found this nudibranch which I can't find in any of the literature around or your site and I was wondering if you could identify it for me. The scanned photo isn't very clear, but if you want a hard copy of the photo I can post it to you for identification. I found it at 2 locations on the 8th & 9th of this month. First time was just on granite rock, and the second was (two different sightings) at a different location and they were on a wine coloured prostrate sponge-covered granite rock. Sand in both locations was approx 20-30 metres away, but both were found on rock.

What confuses me most is the colouring of the outside edge of the mantle is a bit like a flatworm and the inside colouring is kind of "tiger-striped" without the black. From the photo you can see it is a nudibranch, not a flatworm. Size wise the largest was 4 cm and the smallest was about 10mm. Our location here is Bremer Bay, on the south coast of Western Australia between Albany & Esperance. Our water temp at present is 16 to 17 degrees. Let me know what you think.

Craig Lebens

Lebens, C., 2000 (Sep 14) Chromodoris roboi from southwestern Australia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Craig,
This is a colour form of Chromodoris roboi in which the white spots form white bands out to the mantle edge. Have a look at the top of the page and at Dave Freemantle's message below yours for some other photos. This streaky colour form seems to be quite usual in Western Australia.
Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Sep 14). Comment on Chromodoris roboi from southwestern Australia by Craig Lebens. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Chromodoris roboi

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