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Eubranchus tricolor

Forbes, 1838


Erling Svensen Today I got some picures of Eubranchus tricolor - but I did not see the eggs before I look at the pictures on the Mac.

Kjetil Breivik Johnson Hmmm, i have a lot of pictures of tricolour too, but all of them are white? Yours looks red or orange.

Erling Svensen It is the food that is inside the nudi. Others were white, but this one had just finised a Tubularia......

Kjetil Breivik Johnson Actually i ment the colour of the eggs, i understand that the Nudibranch is affected by what it eats but it was new to me that it also could affect the eggs?? But it seem logical as a camouflage..

Ronni Bless Bekkemellem awsome pic Erling !

Bernard Picton I have noticed that in some species the eggs change colour as they develop. I should also say that I am suspicious that these Tubularia-eating Eubranchus tricolor may not be the same species as the ones I commonly find eating Nemertesia. Another species to check, Lucas and Jussi!

Message posted on NE Atlantic Nudibranchs on 10 May 2013
Erling Svensen Today I got some picures of Eubranchus tricolor - but I did not see the eggs before I look at the pictures on the Mac.

Kjetil Breivik Johnson Hmmm, i have a lot of pictures of tricolour too, but all of them are white? Yours looks red or orange.

Erling Svensen It is the food that is inside the nudi. Others were white, but this one had just finised a Tubularia......

Kjetil Breivik Johnson Actually i ment the colour of the eggs, i understand that the Nudibranch is affected by what it eats but it was new to me that it also could affect the eggs?? But it seem logical as a camouflage..

Ronni Bless Bekkemellem awsome pic Erling !

Bernard Picton I have noticed that in some species the eggs change colour as they develop. I should also say that I am suspicious that these Tubularia-eating Eubranchus tricolor may not be the same species as the ones I commonly find eating Nemertesia. Another species to check, Lucas and Jussi!

Message posted on NE Atlantic Nudibranchs on 10 May 2013
Richard Yorke Hopefully I am right in thinking this is a Eubranchus tricolor above a Doto fragilis on Nemertisia. Seen in Loch Carron a couple of days ago.

Peter H van Bragt you are right indeed

Richard Yorke Thanks for the confirmation.

Richard Yorke More pictures from this trip can now be seen at http://www.richardy.co.uk/Orkney13/index.html

Message posted on NE Atlantic Nudibranchs on 04 Sep 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
Richard Yorke My pictures from last weekends dives off the Llyn now at http://www.richardy.co.uk/LlynSept2013/index.html

Shôn Roberts There are some really great photos there Richard. I think the photo of the Crystal Sea Slug is superb. (i think thats what it is).

Shôn Roberts Do you mind if I share your album on my facebook page ?

Richard Yorke No Problem at all sharing it. It is not a crystal sea slug, that is Janolus cristatus. If you look at the Eubranchus tricolor you will see that the tips of the cerata have white tips, then an orange band then white again. Compare that with a Janolus eg. http://www.richardy.co.uk/Doune2013/content/130721_103026_E-520_large.html and you will see the difference.

Shôn Roberts Thanks Richard.

Ruth Sharratt Lovely set of pics Richard - well spotted. I've not managed to spot an octopus this year, so I'm really quite jealous.

Ruth Sharratt Plus - A great picture of the eubranchus - you can really see the detail.

David Kipling Curious to see whether you and Liz and Franki thinks the following is a bivalve or an ascidian. It seems a tad bulbous, and has six-fold (hexagonal) symmetry around the siphons - bivalves always seem to be circular siphons. http://www.richardy.co.uk/LlynSept2013/content/130929_085938_E-520_large.html

Liz Morris I think it looks like a squirt to me. Too shallow. It has frilly siphons, and is 'clean between the siphons'. Is it possible its a Molgula? It is too big for M.oculata that Bernard Picton mentioned the other day?

David Kipling The anatomy of a squirt seems to result in geometric-shaped siphons (square, hexagonal or octagonal). I've never seen bivalves with geometric siphons. The frilly bit (the molgulid 'crown') suggests a Molgula (as does the fact it's buried).

Richard Yorke OK, had discussed this already with Liz and I will now make the change :-)

Liz Morris Please note... I didnt start the online discussion :)

Bernard Picton This looks like Molgula oculata. Well done Liz!

Liz Morris Great. We'll get there eventually with these squirts!

David Kipling So is this the one that Okenia aspersa eats Bernard?

Bernard Picton No I think it eats Molgula occulta. I'm also not sure whether Okenia pulchella is a separate valid species and whether Eugyra arenosa is also on their menu.

Wendy Northway great photos Richard

Message posted on Seasearch North Wales on 02 Oct 2013
David Kipling Eubranchus tricolor from the Cleddau Estuary, Wales

David Kipling Pen EPL-1 and Inon strobe, kit lens and 165mm Inon CUL. Do you think he would notice if I stole the Panasonic macro from Rob Maller? ;)

Rob Maller Dunno...it's sleeping under my pillow till the ice has gone....:) But a great lens David !

Rob Spray There is due to be a new Olympus one quite soon (at last!)

Sarah Bowen Gee, thanks Rob. He needs no encouragement....

David Kipling Remind me when our next dive trip is Sarah Bowen?

Rob Spray Sorry!

David Kipling Do we have a timescale Rob?

Rob Spray Only leaked today but appears to be part of a package of things to go with the new camera. An odd looking lens, quite long and covered in markings (small picture!).

Christian Skauge Nice! One of my favourite species :-)

Message posted on NE Atlantic Nudibranchs on 05 Feb 2012
João Pedro Silva Eubranchus farrani as it's usually seen here in Portugal.

João Pedro Silva Sometimes they appear on other photos as "uninvited guests": http://www.flickr.com/photos/jpsilva1971/7132378367/

Christian Skauge The one top right could also resemble an Eubranchus tricolor...

João Pedro Silva E. tricolor doesn't have the yellow tips of the rhinophores and oral tentacles, nor the yellow blotches on the dorsum. The most similar species here is E. linensis which has always white tips of the rhinophores, oral tentacles and cerata and opaque white pigment at the edge of the foot.

Message posted on NE Atlantic Nudibranchs on 24 Jul 2012
Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
              Aeolidida (Infraorder)
                Fionoidea (Superfamily)
                  Eubranchidae (Family)
                    Eubranchus (Genus)
                      Eubranchus tricolor (Species)
Associated Species