Re: More on spots in Risbecia tryoni
May 11, 2006
From: Bruce Wilkie
![](/images/m16573a.jpg)
Concerning message #16537:
Hi Bill,
I have been reading Julie`s message #16537, Wayne`s message #16500 and Asther`s message #10918 about colour variation of spots on Risbecia tryoni. It reminded me of this animal which I have on file. I am reasonably sure it is R. tryoni. Its colour is quite different from other animals from this area. Thought you might like it for your records.
Locality: Manta Bommie Point Lookout North Stradbroke Island, 10 metres, Queensland Australia, Pacific ocean, 17 December 2005, rocky reef with sponges, hard & soft corals . Length: 80mm. Photographer: Bruce Wilkie.
Many Thanks,
Bruce Wilkie.
brucedwilkie@yahoo.com.au
Wilkie, B., 2006 (May 11) Re: More on spots in Risbecia tryoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16573![](/images/m16573d.jpg)
Dear Bruce,
Thanks for this example. Yes I am sure this is also one of this colour mistakes. I don't think we can call it a colour variant or part of the species colour range. I think it is an animal which is trying to produce dark purplish spots and background pattern but for some physiological reason has been unable to do so.
If I am right, I guess these animals should be considered developmental abnormalities on par with the morphological peculiarities listed on the abnormalities Fact Sheet
Best wishes,
Bill Rudman
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