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Cuthona granosa

(Schmekel, 1966)

Antoni López-Arenas Cama Do you think this could be Cuthona amoena or foliata? Found in Mataró (near Barcelona in the Mediterranean Sea) at 18m depth between Posidonia oceanica leaves. Its size was around 1-2 mm. Thank you! http://www.flickr.com/photos/alopezarenas/8672317737/in/photostream

João Pedro Silva Why not C. rubescens?

Antoni López-Arenas Cama why not... why yes? :-) Thanks

João Pedro Silva I'm suggesting this due to the "red pigment at the bases of the cerata": http://www.habitas.org.uk/marinelife/species.asp?item=W14730

Antoni López-Arenas Cama but i don't know if is dark red or brown like Cuthona amoena :-P http://www.habitas.org.uk/marinelife/species.asp?item=W14660

João Pedro Silva You may be right. Plus the rings on the oral tentacles... not an easy one to ID.

Egidio Trainito Cuthona foliata is not considered a mediterranean species (misidentified C.genovae); I think that it is Cuthona amoena, Cuthona granosa is quite different with head body, rhinophores and oral tentacles covered with very fine opaque white. On rhinophores and head tentacles bright orange on the outer parts, look at this: http://opistobranquis.info/en/guia-dopistobranquis/nudibranquis-nudibranchia/eolidacis-aeolidina/cuthona-granosa/

Antoni López-Arenas Cama Egidio Trainito, between Cuthona amoena and Cuthona rubescens, do you think it is clearly amoena? Thank you!

Egidio Trainito C.rubescens is not a mediterranean species, I confirm my opinion: C.amoena.

Peter H van Bragt Peter H van Bragt C. amoena could indeed be a realistic candidate. The dark spot in the head region (oesophagus), granular cerat content and dark rings in both rhinophores and head tentacles is what we also see here in the Netherlands in C, amoena. But its not realy easy to give such a species a name from a photograph of such a small specimen. On what sort of hydroid did you find it??

Bernard Picton It is more like C. amoena than C. rubescens; note the brown mark on the oral tentacles, never present in C. rubescens. It isn't quite the same as any C. amoena I've ever seen, but most species look a little different in the Mediterranean.

Bernard Picton We need to start work on the gordian knots.. http://www.plosone.org/article/authors/info%3Adoi%2F10.1371%2Fjournal.pone.0047214;jsessionid=C7E26F234C576859D205953D222F1F8B

Antoni López-Arenas Cama I think that Cuthona foliata can be a Mediterranean specie. In past some authors misidentified C.genovae as foliata, but this doesn't mean that there aren't Cuthona foliata in Mediterranean sea.

Antoni López-Arenas Cama Here you can see the "Updated checklist of the opisthobranchs from the Catalan coasts": http://www.molluscat.com/SPIRA/PDF/Spira_2_3_5.pdf

Egidio Trainito Previously C.foliata was signaled for Malta but the specimen looked like a very small C.genovae, it would be interesting to see Catalan specimens. Thanks for the useful pdf.

Message posted on NE Atlantic Nudibranchs on 30 Apr 2013
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
              Aeolidida (Infraorder)
                Fionoidea (Superfamily)
                  Tergipedidae (Family)
                    Cuthona (Genus)
                      Cuthona granosa (Species)
Associated Species