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Janolus hyalinus

(Alder & Hancock, 1854)


David Kipling Can we get confirmation that this is Janolus hyalinus please? Seen a few hours ago in Pembrokeshire (Wales) and found by ace nudi spotter Sarah Bowen. Only one previous Welsh record (Menai, back in 1992) and generally very few UK records - although Seasearch did record two last year (Ness point - Recorder: Nick Blacker, and Skelly Pinnacle - Recorder: Georgia Conolly) according to NBN Gateway.

Lucas CerCur Yes David.

Terry Griffiths And we have had them in Babbacombe nice find there tho.

Ian Smith 8 images of one and spawn from Menai in April 2011 at http://www.conchsoc.org/spAccount/janolus-hyalinus

Kate Lock A great spot - I can barely make out where the nudibrach finishes and the background starts!!

Message posted on NE Atlantic Nudibranchs on 02 Jun 2013
Dan Bolt Hello everyone, I would be very keen to hear your oppinions on this one. Shot at Babbacombe, south Devon, uk, this morning. About 15mm long I would say. I'm *hoping* it's Janolus hyalinus but I expect I'm wrong! Thank you :)

Christian Skauge This is indeed a Janolus hyalinus :-)

Julia Nunn agree Janolus hyalinus

Dan Bolt Thank you folks, very helpfull!

Aldo Brunetti Hello, I am a student of the University Autonoma of Madrid, department of zoology. I am writing to you because I am working on the family Janolidae. I'd like to know if you hvae this specie, because we'd like to study it at the morphological and molecular level. Can somebody help me? Thanl you very.

Aldo Brunetti could you collect one for me?

Dan Bolt Hello Aldo, I have only ever seen this species once in 20 years if diving! It is very unlikely I will be able to help but hopefully someone else can?

Bernard Picton Christian, look at this again. I think the tubercles on the cerata are too big for J. hyalinus and this could be the same as one of the un-named Norwegian ones.

Christian Skauge Yes Bernard, after what we saw at Gulen I am no longer certain this is a J. hyalinus. We also have images of something looking like this as well as a more "true" hyalinus. The caruncle and white patch matches well, but is has way too few cerata. Even the shape of the cerata seems a little off, and I agree about the tubercles. More work is needed on these species!

Aldo Brunetti I am agree, more work is needed on these species, for this I am collecting all species because I want to do a new description. Thank you very much for you message Dan Bolt. I hope someone can help me.

Tamsyn MAnn Sorry... not about nudi's! What was the vis like in there? I'm gonna forget what diving is if I don't get in soon!!!!!

Peter H van Bragt I agree with Bernard, Typical for this species might be the white lines along the side of thecerata. I'll post a juvenile J. hyalinus from the Dutch coast in a minute for comparison.

Jean Michel Crouzet hello, first sorry for my english i am french instructor diver and one my specialite is nudibranch the last year i sea 3 specimens of janolus cf hyalinus all the 3 specimens do 2 cm and dont have white lane Aldo if during the season i found another specimen you want one? i post photos to my specimen

Aldo Brunetti hello, yes please, it would be genial for my study!!! thanks

Message posted on NE Atlantic Nudibranchs on 03 Mar 2012
Peter H van Bragt Refering to the post of Dan Bolt (see below). Juvenile Janolus hyalinus from the Dutch coast. Eastern Scheldt, August 2006. In

Christian Skauge This is the one we have been agonizing over... Sure this is a J. hyalinus? It does not have enough cerata in my opinion...

Peter H van Bragt It's a juvenile, like so many species they have less cerata and indeed very sure about J. hyalinus

Message posted on NE Atlantic Nudibranchs on 15 Apr 2013
Rudolf Svensen Is this Janolus hyalinus?

Bjørnar Nygård It looks very much like it.

Christian Skauge Yes it is! Oh my you're finding a lot of cool stuff these days :-)

Message posted on NE Atlantic Nudibranchs on 21 Feb 2012
Dan Bolt Hello everyone, I would be very keen to hear your oppinions on this one. Shot at Babbacombe, south Devon, uk, this morning. About 15mm long I would say. I'm *hoping* it's Janolus hyalinus but I expect I'm wrong! Thank you :)

Christian Skauge This is indeed a Janolus hyalinus :-)

Julia Nunn agree Janolus hyalinus

Dan Bolt Thank you folks, very helpfull!

Aldo Brunetti Hello, I am a student of the University Autonoma of Madrid, department of zoology. I am writing to you because I am working on the family Janolidae. I'd like to know if you hvae this specie, because we'd like to study it at the morphological and molecular level. Can somebody help me? Thanl you very.

Aldo Brunetti could you collect one for me?

Dan Bolt Hello Aldo, I have only ever seen this species once in 20 years if diving! It is very unlikely I will be able to help but hopefully someone else can?

Bernard Picton Christian, look at this again. I think the tubercles on the cerata are too big for J. hyalinus and this could be the same as one of the un-named Norwegian ones.

Christian Skauge Yes Bernard, after what we saw at Gulen I am no longer certain this is a J. hyalinus. We also have images of something looking like this as well as a more "true" hyalinus. The caruncle and white patch matches well, but is has way too few cerata. Even the shape of the cerata seems a little off, and I agree about the tubercles. More work is needed on these species!

Aldo Brunetti I am agree, more work is needed on these species, for this I am collecting all species because I want to do a new description. Thank you very much for you message Dan Bolt. I hope someone can help me.

Tamsyn MAnn Sorry... not about nudi's! What was the vis like in there? I'm gonna forget what diving is if I don't get in soon!!!!!

Peter H van Bragt I agree with Bernard, Typical for this species might be the white lines along the side of thecerata. I'll post a juvenile J. hyalinus from the Dutch coast in a minute for comparison.

Jean Michel Crouzet hello, first sorry for my english i am french instructor diver and one my specialite is nudibranch the last year i sea 3 specimens of janolus cf hyalinus all the 3 specimens do 2 cm and dont have white lane Aldo if during the season i found another specimen you want one? i post photos to my specimen

Aldo Brunetti hello, yes please, it would be genial for my study!!! thanks

Message posted on NE Atlantic Nudibranchs on 03 Mar 2012
Arie Vreugdenhil Janolus hyalinus with a copepod at 14m in De Oosterschelde The Netherlands. Animal was about 15-20 mm

Arie Vreugdenhil Peter H van Bragt Is this a juvenile specimen, having such small and few cerata?

Ian Smith http://www.conchsoc.org/node/5265

Arie Vreugdenhil Thanks Ian Smith!

Ian Smith The 15mm specimen I've uploaded has well developed cerata. I guess Arie's is starved, sapped by the copepod or in poor condition for some other reason.

Aldo Brunetti I am a student of the University Autonoma of Madrid, department of zoology. I am writing to you because I am working on the family Janolidae. At the present time, in the department of zoology, we only have Janolus cristatus and I would like to know if you have any other species for example: Janolus hyalinus. We want to do a new description about this family and for this we need all the species, because we want to study them at the molecular and morphological level.

Aldo Brunetti Thanks for your time.

Message posted on NE Atlantic Nudibranchs on 26 Aug 2012
Arie Vreugdenhil Janolus hyalinus with a copepod at 14m in De Oosterschelde The Netherlands. Animal was about 15-20 mm

Arie Vreugdenhil Peter H van Bragt Is this a juvenile specimen, having such small and few cerata?

Ian Smith http://www.conchsoc.org/node/5265

Arie Vreugdenhil Thanks Ian Smith!

Ian Smith The 15mm specimen I've uploaded has well developed cerata. I guess Arie's is starved, sapped by the copepod or in poor condition for some other reason.

Aldo Brunetti I am a student of the University Autonoma of Madrid, department of zoology. I am writing to you because I am working on the family Janolidae. At the present time, in the department of zoology, we only have Janolus cristatus and I would like to know if you have any other species for example: Janolus hyalinus. We want to do a new description about this family and for this we need all the species, because we want to study them at the molecular and morphological level.

Aldo Brunetti Thanks for your time.

Message posted on NE Atlantic Nudibranchs on 26 Aug 2012
Dan Bolt Another one that I'm scratching my head over, only about 7mm long this one, again Babbacombe, Devon, UK. Thank you!

Christian Skauge This looks like a Eubranchus exiguus to me.

Terry Griffiths The race is still on Dan thought it was this one lol

Dan Bolt I have to go some way to trump you Terry, you get 2 dives to find more tomorrow :)

Dan Bolt @Christian, thank you for the info :)

Bernard Picton This has too many cerata for Eubranchus exiguus, and note the way they are slightly swollen in two or three places along the length of the ceras. It is what I call Eubranchus doriae, but there was a recent paper (which I don't have here) suggesting that the correct name for this species might be Eubranchus capellinii (if I remember correctly).

Dan Bolt Thank you Bernard :)

Bernard Picton I think it's a southern species in the UK, I consider it to be quite rare, so I'm really pleased to see your photo - also the Janolus hyalinus. You had a good day!

Dan Bolt You are right Bernard; I had a great day! 25years diving and still seeing things new to me, fantastic. Thanks for all your info.

Christian Skauge Yes, I agree with Berard after having a closer look... It sure looks like the E. doriae we have found earlier as well. http://www.undervannsfoto.no/index.php?page=shop.product_details&flypage=flypage99.tpl&product_id=844&category_id=1&option=com_virtuemart&Itemid=224&item_num=2&total_items=2

Bernard Picton Interesting to hear that you have it that far north Christian, I didn't expect that! Nice photo!

Terry Griffiths And i even managed to find one today happy days.

Message posted on NE Atlantic Nudibranchs on 03 Mar 2012
René Weterings "Janolus hyalinus" Again....found at divesite "Zeelandbrug" in the Eastern Scheldt in the Netherlands.

Rob Maller Lucky you !! :)

René Weterings They are easy to find at the moment Rob! It's got very little to do with "luck". ;-)

Rob Maller Have to go and picture a few soon !

Marta Pola Could you collect one for me??

René Weterings That is forbidden Marta! I am sorry.

Marta Pola Lucky him!

René Weterings Haha...yes indeed.

Message posted on NE Atlantic Nudibranchs on 15 Nov 2012
René Weterings "Janolus hyalinus" Normally you don't even know where it's front is, but this time I could see the Rhinophores.....

Rob Maller Idd niet makkelijk te vinden die rinophoren

Pascal Van Acker ook gevonden vandaag prachtvondst

Arne Kuilman Still missing on my wishlist…

René Weterings Yesterday evening I found them again. I saw about 4 of these. So plan a dive at the Zeelandbrug and you propably will have some luck!

Brendan Oonk Changes will improve if you make a nightdive. J.hyalinus is more active after dark.

Message posted on NE Atlantic Nudibranchs on 10 Nov 2012
René Weterings "Janolus hyalinus with eggs" Found on the 7th of november 2012 in the Eastern Scheldt in the Netherlands.

John de Jong Staat er mooi op, René

René Weterings Thanks! Zet er zo nog 1 op, daar zie je ook de rhinophoren een keer. Want meestal zie je niet wat voor of achter is.... ;-)

Message posted on NE Atlantic Nudibranchs on 09 Nov 2012
René Weterings "Janolus hyalinus" Again....found at divesite "Zeelandbrug" in the Eastern Scheldt in the Netherlands.

Patrik Good Congrats, this one seems to be a cracker to spot.

René Weterings Yes, the very first time it is, but once you have an eye for it, it is a lot easier!

Jerry Shine Wow, that's some serious camouflage.

João Pedro Silva Any idea on the culprit? Under 1cm wide. The eggs appear to be quite large. Shot in Berlengas, Portugal, ~8m deep.

Egidio Trainito Janolus cristatus ...

João Pedro Silva Thanks! There are lots of bryozoans in that area and I've seen J. cristatus once in a while there but never seen the spawn. I guess I always expected it to be in a less conspicuous place.

David Kipling This certainly looks like the familiar J cristatus spawn we see in the UK, and it is usually out in a prominent place (usually on the bryozoan they're feeding on).

Bernard Picton I think the other, well-camouflaged, Janolus's might lay the same type of spawn. Check out those bryozoans very carefully, especially if you have Scrupocellaria there.

Ian Smith Janolus hyalinus has more smaller ova across the spawn string width than the picture above, so I'd go with J. cristatus. See http://www.conchsoc.org/node/5272

David Kipling It must be a interesting experience raiding your fridge for a midnight snack Ian!

Ian Smith No prob; food on top shelf, boxes of marine life on the others. You should have heard the scream when a prying lady visitor opened a box with an 8 inch land slug.

João Pedro Silva There's a large tunnel in Berlengas with lots of bryozoans and J. cristatus is often found there but there were no conditions for that on this day.

Ian Smith Just looked up Antiopa (=Janolus) cristata in Alder & Hancock. Spawn illustration (by PH Gosse) fits Joao’s photo; single series of large capsules. Here are some bits of what A&H reported of Gosse’s description: --- transparent gelatinous thread ---- succession of figures of 8 ----- single series of transparent globules --- at first about two thirds filled with opaque white specks in the form of a crescent --- 5 days after deposition, the white specks in the globules had filled the whole interior --- each globule contained more than 60 active little nautiloids " whole spawn mass contained calculated 45,000.

Message posted on NE Atlantic Nudibranchs on 25 Apr 2013
Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Nudibranchia (Order)
            Dexiarchia (Suborder)
               Dexiarchia (Infraorder)
                Proctonotidae (Family)
                  Janolus (Genus)
                    Janolus hyalinus (Species)
Associated Species