Re: Striped Chromodoris roboi?

April 15, 1998
From: Richard Willan

Dear Bill
Here's one of my slides of Chromodoris roboi from eastern Australia. The animal was nestling in a crevice on the side of a vertical cliff wall, 13m, on the eastern side of Julian Rocks off Byron Head, northern New South Wales, 13 July 1980. I think your picture of the gold-striped "form of C. roboi" from WA is definitely a different species. I have seen two specimens from WA (and have superb slides of it by Reg Gentle) and it is consistently different to roboi. I have now got a set of 13 slides of roboi from the man himself, Bob Bolland, and the ONLY difference between roboi and the species in Willan & Coleman (Nudibranchs of Australasia, 1984) is the coloration on the gills - a series of red blotches in the Australian material. Unfortunately Gosliner & Behrens didn't describe the full colour variation in the specimens from Okinawa. So now I believe the eastern Australian specimens are really Chromodoris roboi.
Richard Willan
Museum & Art Gallery of the Northern Territory

Willan, R., 1998 (Apr 15) Re: Striped Chromodoris roboi?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks for the slide and comments. I think I'll leave the striped "form" from Western Australia under Chromodoris roboi at the moment in the hope that it will generate some interest amongst divers to go and see if they can find and photograph some intermediate colour forms... Bill Rudman

Rudman, W.B., 1998 (Apr 15). Comment on Re: Striped Chromodoris roboi? by Richard Willan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Chromodoris roboi

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