Re: More on spots in Risbecia tryoni

May 8, 2006
From: Julie Marshall


Concerning message #16500:

Dear Bill,
Attached are some photos of what seems to be Risbecia tryoni but which has red spots (and orange behind the rhinophores) rather than dark violet spots on the mantle. It was found wedged between coral in a deep coral pool behind the reef crest during a high low tide at Heron Island [Great Barrier Reef] and was 65 mm in size.

Locality: Heron Island, Great Barrier Reef, 2 m., Queensland, Australia, Pacific Ocean, 16 March 2005, Intertidal. Length: 65 mm. Photographer: Julie Marshall.

Best wishes,
Julie Marshall

juliemarshall@netspace.net.au

Marshall, J.G., 2006 (May 8) Re: More on spots in Risbecia tryoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16537

Dear Julie,
I agree with your identification. I think its important to see the whole colour pattern when identifying a species. Sometimes if we get stuck on the exact colour of some spots or lines we may miss what really distinguishes a species and that is its total colour pattern. For example, quite a few of the black-lined chromodorids at times have parts of their lines coloured orange brown.

Another possible example is Chromodoris buchananae, which is known from a single specimen from nthn New South Wales in eastern Australia. I wouldn't be at all surprised if it is an 'albino' form of C. kuiteri in which the areas which normally have black pigmentation could only make an orange colour. As far as I know, no other specimens with this colour form of been found before or since.

I suspect there is something peculiar happening in the colour making physiology of the cells involved - either a gene disorder or perhaps the absence of a vital precursor or pigment. It's the sort of thing I would love to interest a biochemist in but it is hard to guarantee that 'normal' and 'aberrant' specimens would be available when needed for study.

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (May 8). Comment on Re: More on spots in Risbecia tryoni by Julie Marshall. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16537

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