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Cuthona gymnota

(Couthouy, 1838)

Rob Maller @ Klas Malmberg .... Cuthona gymnota with spawn.

Message posted on NE Atlantic Nudibranchs on 01 May 2012
John de Jong Last week at Zeelandbrug, Oosterschelde, The netherlands. Length about 15mm on a depth of 10-12 meters. I thought T. gymnota but I am confused about the length of the white part, can someone give the solution?

Klas Malmberg Aquatilis I have similar pictures and think it is T. gymnota. Once I had a specie with swollen cerata with beautifyl yellow and white on the top of cerata. I left it in a can for two days and after that the cerata was not so swollen and the white part was prominent. So I would say that you got a hungry nudie on the picture...

Peter H van Bragt Hi John, surely Cuthona gymnota. Cheers Peter H van Bragt

Message posted on NE Atlantic Nudibranchs on 09 Sep 2012
Rob Maller Trinchesia gymnota today in Dutch Grevelingen; some 18mtrs depth.... last of the Mohicans I'm afraid; Tubularia nearly gone now.

João Pedro Silva Does anyone care to discuss the use of Trinchesia/Cuthona/Catriona for this species? http://www.seaslugforum.net/find/21285

Rob Maller João Pedro Silva, To be honoust I'm quite confused... some people say, that if there are distinctive white rings near the top of the cerata, it's a Trinchesia, Without (or less distinctive) it would be Cuthona.

Rob Maller Sounds like bs to me anyway...

Floor Driessen The accepted name is: Cuthona gymnota (Couthouy, 1838). http://www.marinespecies.org/aphia.php?p=taxdetails&id=153380

Rob Maller Thx...yes that's what I learned when I first found one of these; there's people who think differently like it seems :)

Message posted on NE Atlantic Nudibranchs on 02 Jun 2012
Eric van Andel Can somebody identify this species for me? (not the best overview...) Dutch waters, March last year, watertemperature was around 4 degrees C. Depth 6-7 meters.

Christian Skauge Hmm... looks very much like a Cuthona gymnota in my eyes.

Message posted on NE Atlantic Nudibranchs on 06 Feb 2012
Kiki Vleeschouwers But one can find beauties in the Netherlands too: Oosterschelde: Facelina bostoniensis , and , when you have sharp eyes: two very small Cuthona gymnota...

Message posted on NUDIBRANCH LOVERS on 18 Nov 2013
Kiki Vleeschouwers A Facelina bostoniensis and in the right upper corner a couple of Cuthona gymnota. The Oosterschelde, the Netherlands

João Pedro Silva I think this is Facelina auriculata due to the white dots on the cerata.

Erwin Koehler read this: http://www.seaslugforum.net/find/22494

Message posted on NUDIBRANCH LOVERS on 08 Aug 2013
David Fenwick Snr Just found what I think are three 2mm Catriona gymnota on a small sample of Tubularia larynx at Sennen Cove, Cornwall, 25.04.13, in an underboulder pool on the lowershore. Can someone confirm the species please.

Peter H van Bragt Hello David, most likely indeed C. gymnota. What's in a name, I believe the current name should be Cuthona gymnota.

David Fenwick Snr Thanks Peter, I tend to follow WoRMS and Conch. Soc. for naming things, this time they don't agree.

Ian Smith Hi Dave, glad to see the hydroid sampling is bringing in results. I'm stuck with the names loaded onto the Conch Soc website when I do descriptions. I've asked for WoRMS to be adopted, but the Society only updates periodically. To try to redress this I put a link to WoRMS under "current taxonomy" on each account. When the title names are eventually updated, it will look like the content of accounts is clinging to old names. My advice is to go with WoRMS. A rose by any name would smell so sweet.

David Fenwick Snr Will send in the record under the WoRMS name just in case it helps. More hydroids and sea mats to go through later Ian.

Bernard Picton Don't worry about the current genus name. Cuthona will be split soon. Latest sequence data suggests that Calma is a Cuthona, so that puts a family inside the genus...

Cynthia D. Trowbridge egad...as bad as sacos...

Message posted on NE Atlantic Nudibranchs on 25 Apr 2013
Erling Svensen Could this be Eubranchus tricolor? Aprox 2,5 cm long, 6 meter of seawater in South West Norway.

Peter H van Bragt No, this a Cuthona gymnota

Erling Svensen Thanks alot - I have never seen this before. Quite big to be a Cuthona gymnota I see.

Christian Skauge I think gymnota too - but it does look a little like the tricolor :-)

Bernard Picton Oh dear, it doesn't look like either C. gymnota, nor E. tricolor, nor anything else I've ever seen! How big was it Erling? I suppose it could be an unusually big C. gymnota....

Brendan Oonk In the Netherlands this nudi is found a lot. We call it C.gymnota Does this mean we've been mistaken all these years?

Bernard Picton I'd be interested to see more photos from the Netherlands, Brendan Oonk, Peter H van Bragt.

Erling Svensen Bernard, can you read? ;-). Look on top above the picture....

Bernard Picton OK, that is big, mine are normally only up to about 15 mm. Colour in nudibranchs becomes more intense and well-developed as they get bigger, so having a feel for this progression is important for identification.

Peter H van Bragt Here (The Netehrlands) we also find up to 20mm+ specimen

Message posted on NE Atlantic Nudibranchs on 06 Feb 2013
Klas Malmberg Aquatilis This could be a Eubranchus tricolor if I follow the normal keys I use, but it has very strange colors. Has anybody else seen this before or is it something else? Picture taken today at Persgrund outside Väderöarna, Sweden.

Rob Maller Looks like Cuthona gymnota to me....

John de Jong http://www.jojodive.nl/Nudy%20branches/Dutch%20%20Sacoglossa%20and%20Nudibranchia/slides/Trinchesia%20gymnota%20.html this one is from the Netherlands, Klas. I named it T. gymnota.....

Klas Malmberg Aquatilis OK - thanks for this information! If it is a Cuthona gymnota then I am very happy because what I have checked so is this not a recorded specie in swedish waters...

Rob Maller Found one during yesterdays dive in the dutch Lake Grevelingen and have seen them every now and then over the years...

Rob Maller If that is the case Klas... congrats !!!

Erling Svensen Can you bring one to Egersund. If so you can stay for free in my house for a week with all facilities, food and free diving. nice picture.....

Rob Maller I could bring you a few if you like Erling :):)

Christian Skauge Good find Klas! Didn't you see this one at Gulen on last year's safari?

Erling Svensen yes, yes....... send them in a bottle of Glenmorangie whiskey....... Two of my favorites then.

Klas Malmberg Aquatilis Yepp - Christian I did take pictures of Cuthona gymnota in Gulen, both times on the nudiesafaris but they look different and I havn´t seen the yellow pigment on the cerata before. The other I have pictures of doesn´t have the pink tone on the rhinofores - so I was confused when I saw this nudie...

Jussi Evertsen The yellow band of pigmentation does fit the description of Cuthona gymnota, also the pink color on the rhinophores, but the bloated cerata does throw it off

Christian Skauge But we did previously identify this one as C. gymnota - on last year's Nudisafari ;-) http://www.undervannsfoto.no/index.php?page=shop.product_details&flypage=flypage99.tpl&product_id=1765&category_id=1&option=com_virtuemart&Itemid=224&item_num=12&total_items=20

Christian Skauge Again; sorry on FB's behalf... wrong thumbnail but no option to choose one when posting links like this :(

Message posted on NE Atlantic Nudibranchs on 01 May 2012
Christian Skauge Still plenty of nudibranchs at the house reef of Gulen Dive Resort, Norway: Cadlina laevis, Cuthona rubescens, Cuthona gymnota, Flabellina nobilis and the illusive Cumanotus beaumonti - to mention a few :-)

Klas Malmberg Aquatilis Fina bilder! Jag längtar dit!!!!!

Arne Kuilman Stunning stuff there. What's the best time to dive there for nudibranchs?

Message posted on NE Atlantic Nudibranchs on 26 Jun 2013
Paula Young Another ID....with apologies for lack of sharpness, but any help with ID for the three tiny nudibranchs munching on the Tubularia near to the Facelina. Are they 'baby' Facelina, or any possibility they could be Catriona gymnota?? Any ideas, particularly welcome from Mr Bernard Picton??

Brendan Oonk They are Cuthona gymnota.

Paula Young Thanks Brendan, I didn't even notice them until I reviewed my photos.

Bernard Picton The big one on the left is Facelina auriculata, note the markings and the lamellate rhinophores.

Message posted on Seasearch Identifications on 29 Sep 2013
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
              Aeolidida (Infraorder)
                Fionoidea (Superfamily)
                  Tergipedidae (Family)
                    Cuthona (Genus)
                      Cuthona gymnota (Species)
Associated Species