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Discodoris stellifera

(Ihering in Vayssière, 1904)

John de Jong Doris pseudoargus ?? at Zeelandbrug, Oosterschelde. 27-08-2012 with Olympus E330, 50mm macro, 1/100s, F18, ISO400 with 2x Ikelite DS160/161

Peter H van Bragt No, I think it is a Geitodoris planata just an uncommon colour variant. Cheers, Peter H van Bragt

Ian Smith Hi John I think this might be a pale Geitodoris planata. The tubercles seem a bit smaller than those on Archidoris, the mantle skirt is spread out nearly horizontal, there seem to be paler areas round large tubercles (acid producing on G. planata) . The clincher would be dark mars on underside of mantle. Oh, Peter has just beaten me and agrees. Have a look at the full description at http://www.conchsoc.org/spaccount/Geitodoris-planata Groetjes Ian Smith

John de Jong Thnx, Peter H van Bragt and Ian Smith. I thought I got a new one :-(

Ian Smith Location, location! I've never seen a live G. planata; the description was with photos and advice from Malcolm Storey who found the specimens shown on the web page. There were hundreds of of Archidoris pseudoargus spawning on a shore of the Menai Straits in Wales last March. Rhaid iddi ti ddo^d i Gymru (You must come to Wales :-) Ian Smith

Peter H van Bragt Hi Ian hop over the ditch. We do have them available in the southwestern estuary of the Netherlands. Although now less common as they used to be. In 2003 I had one dive with over 450 specimen and a max. size of 12 cm. Good old days ;-)

Ian Smith Hi Peter That's a big Geitodoris. I'll alter the Conch Soc account to allow for it. Ian

Tony Gilbert To me this looks like Archidoris psuedoargus. The colouration is that of a sea lemon, not G. planata which are usually brown. Check your images of this as G. planata has 10-12 stellate acid glands on the mantle, so your specimen needs these for id. Additionally, Bernards information indicates no records exist in the North Sea for this. The G. planata specimens I've seen have always been on west coasts. http://www.flickr.com/photos/tonyjgilbert-images/7501724518/in/set-72157630420768730

Ian Smith Hi Tony, have a look at http://www.diverosa.com/categories%20NL/ff%20naaktslakken.htm on it there are unmistakeable Geitodoris from East Scheldt estuary, branch of N.Sea. One is so low profile it looks like it's melted over the substrate. Another clearly shows the purplish peppering on the stem of the rhinophore. The tubercles are right for Geitodoris on these photos and on John's. Also Peter says he had 450 in one dive. Morphology is much more important than colour, but you can make out the pale acid papillae on John's specimen even though it is a pale specimen. The most decisive colour factor is to look for the dark marks on the under side of mantle and upper surface of foot on Geitodoris. Check out the conch soc description (link on my earlier message), it raises the possibility that Geitodoris is overlooked as A. pseudoargus in Britain. Cheers Ian

João Pedro Silva An example of a very flat G. planata: http://www.flickr.com/photos/jpsilva1971/6578495629/

John de Jong I will search him next week, and make some pics from the underside. First - have to find him ofcourse........

Ian Smith John I have just looked at Peter's excellent messages & photos about Oostschelde Geitodoris on the Sea slug forum: http://www.seaslugforum.net/find/5126 It seems from his photos that the dark marks, while present on the underside of the mantle and upper surface of foot of Dutch specimens, they may not be as heavily marked as on the British ones shown on the Conch Soc site. Cheers Ian

Ian Smith Joao have you any suggestions on how to separate Geitodoris planata from 'Doris' stellata, apart from radula dissection? I've seen several Mediterranean shots of slugs identified as stellata, but I find them difficult to distinguish on external appearance. Do you on the Atlantic-Med corner have experience of both species? Thanks if you can help. Ian

João Pedro Silva Ian, the only truly safe way to distinguish them is through the radula. But, at least aroung these parts, G. planata appears to show a more regular pattern on the mantle than Discodoris stellifera. Both show dark spots on the underside of the mantle. http://www.flickr.com/photos/jpsilva1971/6824858576/

Message posted on NE Atlantic Nudibranchs on 31 Aug 2012
Robert Eriksson

Robert Eriksson Following Erlings discussion below. Pale A. pseudoargus, G. planata... Or?!

Klas Malmberg Aquatilis I would say G. planata because o the starlike symetrical spots?

João Pedro Silva Here in Portugal we have another similar species, Discodoris stellifera, with the same star shaped marks. I agree this is most probably G. planata.

Bernard Picton Robert, yes, certainly this is Geitodoris planata. You are right, the mix of small and large tubercles is more or less the same as in Archidoris pseudoargus. The gills directed to the rear is very typical of Geitodoris. Joao, I'd love to hear how you distinguish Discodoris stellifera....

João Pedro Silva Bernard, in the next hour or so I'll be posting one of today's photos showing D. stellifera. I made a couple of photos to show the brown spots one the underside on the mantle edge and also showing the large oral tentacles.

João Pedro Silva Hmm, same in G. planata. Maybe we should check the radula? Anyway, we collected it.

Message posted on NE Atlantic Nudibranchs on 29 Feb 2012
João Pedro Silva Discodoris stellifera Local: Tróia, Portugal Profundidade: intertidal Data: 10-03-2012

Message posted on Nudibranquios on 03 Sep 2013
João Pedro Silva Here's G. planata, very hard to distinguish from Discodoris stellifera.

Message posted on EPAM Nudibranchs on 05 Jun 2012
Orietta Rivolta Discodoris stellifera (Vayssière,1904) Numana,Italy

João Pedro Silva Have you also found Geitodoris planata? Those are really hard to distinguish.

Orietta Rivolta No, never seen Geitodoris planing. The ID of my nudibranchs in Italy were made by the biologist Federico Betti.If it were Geitodoris planata I've one more species!

João Pedro Silva They're very difficult to distinguish.

Message posted on EPAM Nudibranchs on 05 Jun 2012
René Weterings "Geitodoris planata" @ Divesite "Zoetersbout", Easterscheld The Netherlands For me it was already more than 1,5 years, that I found this nudibranche in the Dutch waters....!! It sat at 6,5m at intermediate tide, west of the stairs, including eggs!!

Arne Kuilman Nice find! Haven't seen it in 2 years either.

Rob Maller Nice to have them back indeed!

Tony Gilbert Not sure which is the synonym now, but I know it as Discodoris planata, characterised by the acid glands. There is a similar southern speices. Just last weekend, I spotted and photographed one in Loch Long am sure Jim Anderson would be interested, as it was near Tighness slip.

Jim Anderson It's Geitodoris planata.

Brendan Oonk WoRMS says Geitodoris planata is the accepted name'

Tony Gilbert Ok, thanks. When I spotted mine I thought of xx.planata, and couldn't make up my mind --- underwater. I find it easier by naming things underwater as I go along.

João Pedro Silva Further south there's also Discodoris stellifera, very hard to tell both appart without examining the radula.

Peter H van Bragt Hi René, it seems that they may be emerging again this year. Several records already at Zeelandbrug with spawn and Burghsluis too.

René Weterings Yes, I think so too Peter, other divers have spot them too at different divesites. Also on the south side of the Eastern Scheldt.

Message posted on NE Atlantic Nudibranchs on 31 May 2012
João Pedro Silva Geitodoris planata Local: Arrábida, Portugal Spot: Alpertuche Profundidade: 4m Data: 26-12-2011

María Eugenia Suárez Tienes alguna foto de este nudi por su parte inferior? Hace tiempo vi una parecida dada la vuelta por un aletazo y me gustaría saber si es la misma. Gracias.

João Pedro Silva Tenho algumas fotos de pormenor mas não as tenho online. São laranja/amarelado com pequenos pontos castanho-escuro. Mas... Discodoris stellifera também tem os mesmos pontos: http://www.flickr.com/photos/jpsilva1971/6824861188/

João Pedro Silva As duas espécies (D. stellifera e G. planata) são tão semelhantes que apenas a observação microscópica da rádula as permite distinguir (como entre Trapania hispalensis e Trapania tartanella). Mas os recentes estudos genéticos vieram confirmar que determinados aspectos morfológicos (como a rádula ou as mandíbulas) podem variar dentro de uma mesma espécie. E pode ser que, quando se fizer a revisão da família Discodorididae com recurso ao ADN, se descubra que afinal se trata da mesma espécie.

Message posted on Nudibranquios on 01 Sep 2013
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Euctenidiacea (Suborder)
              Doridacea (Infraorder)
                Doridoidea (Superfamily)
                  Discodorididae (Family)
                    Discodoris (Genus)
                      Discodoris stellifera (Species)
Associated Species