Risbecia tryoni from Julian Rocks, nthn NSW

July 1, 2002
From: David Wachenfeld

Hello Bill
I took the attached photograph at Julian Rocks, off Byron Bay in northern New South Wales, on the east coast of Australia in December 2001.

I'd be very grateful for any information you can give me on species id's and behaviour of what the nudi's are doing.
Regards,
David

triggerfish@bigpond.com

Wachenfeld. D., 2002 (Jul 1) Risbecia tryoni from Julian Rocks, nthn NSW. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6402

Dear David,
This is a species of chromodorid called Risbecia tryoni. All I can say about what they are doing is what you can see - they are touching their 'heads' together. If you have a look at the other messages on the page you will see that this species, and other species of Risbecia have a behaviour we commonly call 'trailing' where one follows another animal very close behind - probably following its mucous trail. This may be a prelude to mating but it has not been studied in detail, although it has been observed often. It is possible your animals are 'getting to know each other' as a preliminary to mating but that is only a guess,
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jul 1). Comment on Risbecia tryoni from Julian Rocks, nthn NSW by David Wachenfeld. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6402

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