Geitodoris portmanni

Antoni López-Arenas Cama Another opisthodoubt from the same dive: http://www.flickr.com/photos/alopezarenas/9296152954/in/photostream/lightbox/ http://www.flickr.com/photos/alopezarenas/9296152292/in/photostream/lightbox/

João Pedro Silva Good question. Not sure. Does remind a bit some more uniformly coloured Geitodoris planata. http://www.flickr.com/photos/jpsilva1971/6578323353/

Brendan Oonk G. planata does have light star shaped acid glands, which I don't see in this picture.

Ian Smith The rhinophores and gills look right for planata. Light stars vary in their development; on some of your Flickr images I can see the large white acid producing tubercles and the white "star-material" seeping round the orange body tubercles. There is a selection of specimens, including an orangey one, and close ups of rhinophores & gills at http://www.conchsoc.org/spAccount/geitodoris-planata (make sure to click along the thumbnail strip as many images hidden on right). I'd say your det. is right. Did you check under the mantle for blotches (but sometimes absent)?

Ian Smith I'd better add a note of caution. I misread the location as Calais on le Manche; you have more possibilities in Cataluña.

Antoni López-Arenas Cama Any suggestion? :-P

Ian Smith Sorry, I'm not experienced in Med. spp. I've asked Jakov Prkic in Croatia if he thinks if it's ok for planata or if he has a suggestion. I'll let you know if he opines anything. I'm sure you'll know if you've looked on Bill Rudman's old Sea Slug Forum that the group is notorious for Opisthodoubta; I like the term you coined :-) BTW, you have a great selection of lovely images on Flickr. Before posting this I've just checked in Schmekel & Portmann "Opisth. des Mittelmeeres". Their illustration of Platydoris argo Tafel 3:3&4 is very close your image. If you have, or can borrow, a copy, it would be worth working through the text to see if you can match the features (the sheath round the rhinophore socket seems a bit high in their illustration). Schmekel says of P.argo, "gills orange with brownish red and opaque white dots at the tip." I can see opaque white tips on your image http://www.flickr.com/photos/alopezarenas/9293373621/in/photostream/lightbox/

Antoni López-Arenas Cama I think Platydoris argo has a typical granular texture and my specimen has a bigger glands. I would like to have this book, but it's very expensive :-P Some day... Thank you very much.

João Pedro Silva Brendan Oonk, the glands may not always be so conspicuous. One of the individuals on the photo I posted above does have them but are only noticeable in detail: http://www.flickr.com/photos/jpsilva1971/6578301813/ Regarding the P. argo possibility, the texture is very different from Antoni's individual: http://www.flickr.com/photos/jpsilva1971/7645095810/

João Pedro Silva Gonçalo Calado, did we get a verdict from this one from Alpertuche last year? Reminds be a bit of Antoni's photo: http://www.flickr.com/photos/jpsilva1971/6751588775/

João Pedro Silva There's an "Unidentified" album in this group. I've uploaded last year a more detailed crop: https://www.facebook.com/photo.php?fbid=3253540898442&set=oa.167103413400947&type=3&theater

Gonçalo Calado It could also be a Thordisa, I think

João Pedro Silva The papillae in Thordisa filix and T. azmani seem less dense and thinner than the ones in this individual (and also on the one I shot later but not collected: http://www.flickr.com/photos/jpsilva1971/6896123624/)

Ian Smith I agree not P argo. Joao's images show the texture convincingly and the white tips on the gills to be far more extensive than I'd realised. I'd better leave southern stuff to you southerners. Toni you are right about Schmekel; greatly overpriced, but worth searching the web occasionally. I hit lucky and got a perfect like-new copy for £70 instead of usual £300. But do we really need Schmekel now Joao's Algarve book is available?

Ian Smith Jakov Prkic replied to my enquiry: Regarding Toni's images, the specimen certainly is not Platydoris argo. I think it belongs to planata-stellifera complex, where we can add also Geitodoris portmanni, a very doubtful species, closely related to stellifera. Toni's specimen has some features which correspond with original description of G. portmanni (redish/orange colour, large and conical tubercles, shape and number of gills, ...). But it has also a very unusual colour of the gills (there are two different colours!!), so this feature complicates its ID. In my opinion Toni's slug is more similar to stellifera/portmanni than to planata.

Lucas CerCur It is not T. filix nor T. azmanii. I agree that could be a "Geitodoris", but..... Again, we need to check internal anatomy to have some light, although it is probable that a definitive ID could be not obtained only from the anatomy.

Egidio Trainito The problem is that this is a very small specimen