Flabellina ischitana vs F.affinis

May 30, 2007
From: Dominique Horst

Hi Bill,

Having a look at pictures I've taken from Flabellina affinis and Flabellina ischitana and the description about the differences made by the authors, I still don't feel comfortable on some identifications. I have initially identify the 3 animals as F. ischitana, but I would say now that A and B-C are more probably F. affinis, even D may be ?

Locality: Cap d'Antibes, 18m, France, Mediterranean sea, 22 August 2006, rocks. Length: 20mm. Photographer: Dominique Horst.

If you could help me on these, I would be very pleased.

Many thanks and kind regards,
Dominique

dominique.horst@wanadoo.fr

Horst, D., 2007 (May 30) Flabellina ischitana vs F.affinis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/18475

Dear Dominique,
My understanding is that in Flabellina ischitana the ceratal surface is translucent, without violet colouration, while in Flabellina affinis the zone under the subapical white ring is opaque violet, obscuring the digestive gland.  Looking closely at your photos I would say all of these are F. affinis.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (May 30). Comment on Flabellina ischitana vs F.affinis by Dominique Horst. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/18475

Factsheet

Flabellina affinis

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