Re: More on spots in Risbecia tryoni

May 5, 2006
From: Wayne Atkinson


Concerning message #10918:

Hi Bill
Following on from the post on Risbecia trailing and the patterns of leader and follower I thought you might be interested in these photos showing a light form being followed by a quite different smaller darker form with a rosette-like patterning around the spots.

Locality: Dumaguete, , 10m, Philippines, Indo-pacific, September 2004, coral sand. Photographer: Wayne Atkinson.

Love the forum btw.

Wayne

wayne.atkinson@blueyonder.co.uk

Atkinson, W., 2006 (May 5) Re: More on spots in Risbecia tryoni. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16500

Dear Wayne,
Thanks for the photos. I doubt if it Nobel Prize sort of stuff but I would really like to know what the purpose of 'trailing' is. I know there are 'common sense' explanations like keeping together for mating or making it easier for the 'follower' to find food, but there are many species of chromodorids that don't trail, and they seem to survive quite successfully.

Concerning the colour of the small animal. I don't recall seeing one quite as dark as that. Perhaps it only makes back pigment as a juvenile and so becomes lighter as it grows. But then if you look at other messages on this species there are photos of juveniles which are much lighter in colour so I guess it is just a colour variant..
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (May 5). Comment on Re: More on spots in Risbecia tryoni by Wayne Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/16500

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