Chromodoris geometrica & C. conchyliata from S. Africa

June 26, 2000
From: V.Fraser


Dear Bill
I am sending you two photos taken in the same area. I think they are Chromodoris geometrica. The one with the greenish rhinophores and gills (UPPER PHOTO) is very common. The other form (LOWER PHOTO) is an uncommon variation. I would appreciate your comments.

Locality: Scottburgh - 25m - south coast KwaZulu-Natal, SOUTH AFRICA
Date: June 2000
Size: 35mm
Regards
Valda Fraser

Fraser, V., 2000 (Jun 26) Chromodoris geometrica & C. conchyliata from S. Africa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2570

Dear Valda,
This is another interesting find. As I discussed in an earlier message from Bernard Picton, the typical green-gilled C. geometrica has been considered essentially a Western Pacific species, although Nathalie Yonow has reported it from the Maldives. We thought that in the Indian Ocean C. geometrica was replaced by a similarly coloured animal, Chromodoris conchyliata, which differs in having orange-red edging to the gills and the upper half of the rhinophore clubs orange-red.

Your photos clearly show that both species co-exist in the western Indian Ocean. Your UPPER photo is of Chromodoris geometrica and the LOWER one Chromodoris conchyliata.

It would ne nice to know if the two species differ in the sponges they eat or the shape and/or colour of their egg ribbon, and perhaps difference in egg size. So if you could keep that in the back of your mind with all the other things I have asked you to look out for .....

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Jun 26). Comment on Chromodoris geometrica & C. conchyliata from S. Africa by V.Fraser. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/2570

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Chromodoris geometrica

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