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Jorunna tomentosa

(Cuvier, 1804)

Tamsyn MAnn Jorunna tomentosa laying eggs... was at a bit of an awkward angle!

Tony Gilbert Nice, one. Interesting colour variation, as they are usually sadny brown - dull yellow. Must be the diet.

Message posted on NE Atlantic Nudibranchs on 07 Jul 2012
Allison Gleadhill ? cadelina laevis without the obvious glands or something completely different? One of my few photos of a nudibranch big enough to see that is in focus! At the Farne islands, Northumberland last weekend @ 15m and a tropical 10'C

João Pedro Silva Jorunna tomentosa.

Bernard Picton No, I don't think it is Jorunna. Cadlina in the North Sea can look like this. I often wonder if we have more than one species in the UK but as they have direct development there could be regional subspecies.

Message posted on NE Atlantic Nudibranchs on 07 Jul 2013
Tamsyn MAnn Only these two on my dives today where the photo was half decent. Saw a tiny (10mm) Flabellina pedata but pics hopeless after strobe ran out of battery and had surge and torch!! Jorunna tomentosa picture rubbish as well. Nothing to blame for that...!

Message posted on NE Atlantic Nudibranchs on 08 Aug 2013
Erling Svensen From yesterdays dive. I saw many Jorunna tomentosa - some eating sponge, but also some on the tine green algae. Any clue what they do on the algae? Maybe like the dogs - they eat grass for their stommac ;-)

Tony Gilbert A good point. Perhaps they off-gas on other marine life. Is the sponge a Haliclona oculata, which I think is their food source. They do seem to hack this down very quickly! http://www.flickr.com/photos/tonyjgilbert-images/6914276366/in/set-72157629775691515

Message posted on NE Atlantic Nudibranchs on 25 Apr 2012
Erling Svensen Could this flat nudy be a Jorunna tomentosa? Its on a rock with a litle silt on it. I saw some tiny J. tomentosa during the dive, but this one (if it is J. tomentosa) was aprox. 2 cm long.

Christian Skauge I don't think so... the Jorunna should have more spiky, almost hair-like tubercles - these seem more rounded. Could it be a juvenile Doris pseudoargus?

Robert Eriksson Look at the acid glands. I'd say a starved geitodoris planata because of the few "glands". They appear more round when not moving and therefore atypical compared to e.g. Thompson o brown 1984.

Bernard Picton I agree with Christian, I think Archidoris pseudoargus (can't bring myself to call them Doris yet!) The mixture of rounded smaller and larger tubercles is just right. I don't think those are acid glands, Robert, but I don't know what they are.

Peter H van Bragt Considering the mix of relatively large and smaller tubercles, I agree with Bernard. On few occasion we also found such pale individuals on the Dutch coast.

Robert Eriksson I am not convinced. I have one photo of what I regard a G. planata. There are several characters which are different from A. pseudoargus; bilamellate mantle for instanstance. Had a discussione with Jussi regarding this... se my obsolete opisthobranch webpage... http://web.comhem.se/~u93824250/ob/

Robert Eriksson I see that this one has crenulated edges round the rhinophores. My photo shows no such character - has anyone read the species description of G. planata and A pseudoargus lately? I would say that crenlutade edges is a very stabile trait, in contrary to "spots", "brown colour" or "flattened shape".

Message posted on NE Atlantic Nudibranchs on 28 Feb 2012
Paul Semmens Erring towards Jorunna tomentosa for this though would like others' more informed opinions.

David Fenwick Snr Looks like the sea squirt Corella eumyota to me Paul; it appears to have siphons at the top and to the right, half way down.

David Fenwick Snr Jorunna have just started appearing at Chimney Rocks, Penzance in the past couple of weeks so there's every chance of seeing them down there http://www.aphotomarine.com/sea_slug_jorunna_tomentosa.html

Paul Semmens Thanks Dave

David Fenwick Snr Paul my guess is that the brown animal embedded into the squirt is probably the bivalve mollusc Marbled Crenella, Modiolarca subpicta syn. M. tumida. I've removed a few molluscs from sea squirts recently and to check at home, they've all been this species.

Cláudio Brandão This is a unknow (yet) species that came on a plankton net, meant to catch crab larvae. It was photographed by me and then released again to the same location it was caught! =) João Pedro Silva, any hint on the species?

João Pedro Silva Jorunna tomentosa?

Cláudio Brandão Do you think? I really though it was not like J. tomentosa! :$

Cláudio Brandão Ok, my bad.. It is J. tomentosa (not sure how I missed it)! Another species in Ria de Aveiro! =)

João Pedro Silva This one was shot at the end of a dive we both did in Peniche: http://www.flickr.com/photos/jpsilva1971/5500086901/ It could also be Jorunna onubensis, although they're hard to distinguish.

Message posted on NE Atlantic Nudibranchs on 08 Apr 2012
Sarah Bowen And while I'm on a roll, this is an Onchidorid found in Fair Isle in August 2011. Bernard and David had some correspondence about it. We did cautiously consider inconspicua, but realise that's very unlikely indeed.

Christian Skauge Jorunna tomentosa?

Bernard Picton I think this is Doris pseudoargus. Unfortunately the gills are retracted, but the pattern of larger and smaller rounded tubercles on the mantle is just right for that species. It is very variable in colour, smaller ones often a single colour like this one.

Christian Skauge I think you're right. The jorunna should be smoother and more velvety, with almost spiked (very narrow) tubercles.

Message posted on NE Atlantic Nudibranchs on 04 Feb 2012
René Weterings "Jorunna tomentosa" Found at divesite "Zeelandbrug" in the Eastern Scheldt, The Netherlands on the 31st of july 2012.

Message posted on NE Atlantic Nudibranchs on 02 Aug 2012
Becky Hitchin My nudi from Walpole Bay swimming pool. I assumed at first it was D. pseudoargus just because of its size and that's what we tend to get by way of big nudis. But as Sarah Bowen and David Kipling pointed out, it does look maybe more like Jorunna tomentosa ...

Peter H van Bragt Yes I do agree, J. yementosa. Cheers Peter H van Bragt

Becky Hitchin Wow. I think that's our first record of J. tomentosa in north Kent :)

David Kipling And you get to put Sarah down under the "ID provided by..." column on marine recorder ;)

Becky Hitchin :D

Becky Hitchin That'll confuse our MR, I don't think it knows Sarah yet!

Sarah Bowen And flattered though I am, I don't think I have the credentials - just a reasonable eye and an interest in critters!

Becky Hitchin pffffff :P thats more than most have! :)

Becky Hitchin honestly, I can't tell. Too small. Just moved house and literally have some old take-out containers to hold things and embroidery needles and toothbrushes to poke things! Will try and look under a microscope as soon as I can!

David Kipling You're poking Jorunna?!?

George Brown Has Becky got her groups mixed up? :)

David Kipling More like her Kingdoms. And they let her loose on Marine Recorder? *shakes head*

Becky Hitchin LMAO sorry! that should have been the Sargassum as you all well know!

Marco Faasse I can imagine you get confused by algae with egg ribbons :-)

David Kipling Give Becky Eggs Florentine (eggs on spinach) and her head must spin ...

Marco Faasse We shouldn't tell her about seaslugs with chloroplasts ...

David Kipling Do we get proper 'solar powered' nudibranchs (as opposed to sacoglossans) in the NE Atlantic?

Becky Hitchin Oi! I'm working on a very slow mobile broadband connection here! TYou're lucky to hget any of my words of wisdom, let alone in the right place :P

Becky Hitchin and when nudis / sacoglossans have chloroplasts, what % of their body weight / mass is taken up with them?

Marco Faasse Words of wisdom are needed now. I never said I've got any wisdom. David Kipling. sacoglossans are not seaslugs? I avoided the word nudibranchs. Should I use a different word (not seaslugs) for the group of nudibranchs and sacoglossans together?

Becky Hitchin Is there a word that describes the two together? They aren't taxonomically discrete, are they? Just different parts of the opisthobranchs? (trying to remember Jim Anderson's words of wisdom!)

David Kipling Two glasses of wine, now try to say "opisthobranch" ... ;)

David Kipling BTW what does opisthobranch mean (as well as being difficult to pronounce)?

João Pedro Silva Posterior gills

Marco Faasse Those are wise words ... A pity that words like opisthobranch seem to be necessary. Nudie sounds so much lovelier.

João Pedro Silva But there are several other opistobranchs besides nudibranchs and sacoglossans: cephalaspideans (head shield slugs), anaspideans (which includes sea hares), pleurobranchs (side gilled slugs), umbraculids, etc.

Message posted on NE Atlantic Nudibranchs on 06 Jul 2012
João Pedro Silva Jorunna tomentosa Local: Berlengas, Portugal Spot: Cova do Sono Profundidade: 6m Data: 11-01-2012

Message posted on Nudibranquios on 04 Sep 2013
Orietta Rivolta Jorunna tomentosa Cuvier,1804 Numana,Italy June 2011

Message posted on NUDIBRANCH LOVERS on 19 Jan 2012
Tamsyn MAnn Thought this was quite interesting having a Nudi (Jorunna tomentosa) next to a long spined scorpionfish (Taurulus bubalis)

Chris Barrett As far as I'm aware, turkish bubalis don't predate on nudis, unless Andy Horton or Douglas herdson can say differently?

Chris Barrett Oops, *taurulus. Silly predictive text!!

Andy Horton Taurulus bubalis will probably swallow anything, but nudis are likely to spat out again, but mostly they will not recognise them as food or recognise them at all.

Chris Barrett I dissected a 1.8cm taurulus today- full of calanoid Copepods!!

Andy Horton Text can now be edited.

Tamsyn MAnn Sorry...have made this public...I keep doing that...

Tamsyn MAnn a few nudi's spotted in Plymouth today...

Tamsyn MAnn Names of them would be appreciated... am being lazy...

David Kipling First one looks like Onchodoris muricata to me ;)

Terry Griffiths Named a few for you Tam dont be lazy lol

João Pedro Silva Dawn Watson: Only those in Tamsyn MAnn's network can see the pictures. I can't see them either.

David Kipling Is this a FB feature that if you share an Album to a Group then only your Friends in the group can see the pics, João Pedro?

João Pedro Silva No, David. This depends on each person's privacy preferences. If you choose that your photos can only be seen by our friends then it doesn't matter in which group you share the photos: they will only be seen by your friends. Fortunately you can change this individually by picture or album without affecting your preferences.

David Kipling Ah I understand. Must remember that when posting to a Group. We should probably make a post in the group to let people know - its happened a few times.

Tamsyn MAnn Doh... didn't think of that. will sort out the status so you can actually see the pictures. I thought as I was sharing it, you'd be able to see them... Sorry!

Tamsyn MAnn I think I've sorted it...

João Pedro Silva I think now everyone can see them. Thanks, Tamsyn MAnn!

Christian Skauge Thanks :-)

João Pedro Silva 1st, 3rd and 7th are Polycera faeroensis. 8th is Jorunna tomentosa.

David Kipling Yah! Yes, Tamsyn MAnn, I can see them now. Well worth the wait ;)

Sarah Bowen And the spotty one is Thecacera pennigera! And the yellow bumpy one Doris sticta - both of which are good finds!

David Kipling Ooh, Doris sticta, not common!

Sarah Bowen Beat you to it!

David Kipling (I'd be more impressed with Sarah's ID of the D sticta if it wasn't labelled as such on the picture ...)

Terry Griffiths I was going to label them all before you had seen the pictures but then no fun.

João Pedro Silva (I knew it, all this stuff about hiding the pictures was a conspiration to avoid us to quickly identify the small beasts...)

João Pedro Silva (that is to be read with Peter Lorre's voice)

Terry Griffiths Joao i could put up one of albums to make you happy.

Tamsyn MAnn Thank you for the ID's! There were 2 Thecacera pretty close to each other. Terry found one, I found the other! x

Message posted on NE Atlantic Nudibranchs on 15 Apr 2012
Giorgio Russo she was so fat!

Gary Cobb Nudibranchs are actually hermaphrodite!

Giorgio Russo i know, but for me it's a she! :)

Gary Cobb And a beauty she is!

João Pedro Silva It's funny that in spite of being hermafrodites most species have feminine names. Actually, the masculine names are the exception (Janolus, Eubranchus are masculine). I know I've only mentioned the genus but it's easy to see the specific epithet usually agrees on gender (sometimes it's even changed for that reason).

Gary Cobb Hey Joao nice thread and quite true! Do the rules state that when a species is described and named, no one can change it unless they prove it is another species? Genus changes don't change the species name.

Gary Cobb You're referring to genus right? It also seems that most species names are named after men.

João Pedro Silva The species named after men have the possessive form (like Aeolidiella alderi, which translates to "Alder's Aeolidiella") but most have actually attributes in the feminine form (for instance, Jorunna tomentosa, Doriopsilla areolata, Diaphorodoris papillata, etc).

João Pedro Silva Janolus cristatus has the specific epithet in the masculine form to agree with the genus (otherwise it would be "cristata").

Gary Cobb Thanks Joao.

Message posted on NUDIBRANCH LOVERS on 03 Nov 2012
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Euctenidiacea (Suborder)
              Doridacea (Infraorder)
                Doridoidea (Superfamily)
                  Discodorididae (Family)
                    Jorunna (Genus)
                      Jorunna tomentosa (Species)
Associated Species