Re: Risbecia ghardaqana

November 1, 2000
From: Gordon T. Smith

Dear Bill,
The examples I found in Musandam were around 5cm long at a depth of 15m, water temperature was 29C I do not appear to have any shots showing the foot, however I also do not recall noticing any purple edge on the foot. As for waving gills whilst moving, they were continually in the mating position, however the gills on both animals did retract on several occasions when I was photographing them.

I hope you enjoy your month's break in the field.
Best regards

Smith, G.T., 2000 (Nov 1) Re: Risbecia ghardaqana. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Gordon,
The gill movement I was wondering about is a constant side to side flickering or waving of all the gills. It occurs in most species of Risbecia and Thorunna and some species of Noumea, and is a worthwhile thing to note if you notice it in any chromodorid you come across.
Best wishes,
Bill Rudman.

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