Re: Diaphorodoris luteocincta from France

April 17, 2008
From: Dominique Horst


Concerning message #20029:

Hello Bill,

This is the first time I have seen Diaphorodoris luteocincta with the red back, [var reticulata?]
Not sure on these pictures if the shape is very different between the two.
All these pictures were taken exactly at the same place separated by 3 weeks. The obvious difference is the red colour on the back, and also spots on the side and red spread on the rhinophores.

Locality: Antibes, 12m, France, Mediterranean sea, 7 April 2008. Length: 12mm. Photographer: Dominique Horst.

If I understand, the discussion is still open about variety or species?

Kind regards,
Dom.

dominique.horst@wanadoo.fr

Horst, D., 2008 (Apr 17) Re: Diaphorodoris luteocincta from France. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21506

Dear Dom,

Thanks for these photos. The red spots on the body and red on the rhinophores seem a bit unusual, but the general consensus is that we are dealing with a single species. However Bernard Picton argues quite strongly for two species. In taxonomy the debate is never finished, it may go quiet for a while, but then someone will find a difference or biological observation which starts it all up again. In this case the important thing is to keep a small doubt in the back of your mind about Diaphorodoris luteocincta.  Then if sometime in the future you come across a small anomaly - perhaps you will find them laying different sized eggs, or you see oneof each colour form mating together - you will realise you have seen something interesting and take a photo.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Apr 17). Comment on Re: Diaphorodoris luteocincta from France by Dominique Horst. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21506

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