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Berthella plumula

(Montagu, 1803)

Anthony Hurd Hi. We found this individual recently in North Yorkshire. I am thinking it is Berthella plumula but having not seen this species before would welcome comfirmation or correction. It was found in the intertidal. Many thanks in advance.

Christian Skauge I would agree on B. plumula :-)

Paula Lightfoot Nice photo! Was that the one from the YNU trip to Cayton Bay?

Anthony Hurd Hi Paula. No this was found on Tuesday at Port Mulgrave. I've never seen one of these before so was very pleased to find it!

Paula Lightfoot Brilliant! I hadn't seen them in Yorkshire until the Cayton Bay trip last October, and there's only one Yorkshire record on the NBN Gateway (made by Adrian at Yons Nab... in 1972!).

Ross Bullimore Found 20 or 30+ Berthella down here in Cornwall last weekend mid to upper shore...a first for me even (as far as i remember). No pics sadly though. Any idea if they are around all year or just an early spring thing?

Bernard Picton We looked at two shores in Strangford Lough at the beginning of the week and there were a few Berthella on both. I'm not sure how seasonal they are, nor whether I've ever seen spawn.

Message posted on NE Atlantic Nudibranchs on 15 Mar 2012
David Fenwick Snr Just back from Chimney Rocks, Penzance and wondering if anyone has come across this chap before. about 18mm.

Andy Horton This looks familiar: http://www.seaslugforum.net/find/bertplum

Andy Horton Feature before @ http://www.glaucus.org.uk/Torpedo2003Jan.htm

David Fenwick Snr If it is it's the weirdest one I've ever seen as we are looking at its top and not bottom. What this one is walking on is its foot !

David Kipling Has something taken a bite out of its back?

David Kipling http://www.marlin.ac.uk/speciesinformation.php?speciesID=2757#

David Fenwick Snr I know Berthella plumula well and find it just about every time I go out and have photographed it from top to bottom, I would possibly agree related but not the same.

David Kipling I don't think it's upside down; if Berthella then it's the right way up looking at those rhinophores and the flap of tissue underneath. The weird thing is the lack of that typical mantle over the top ... it's also encrusted with sand which again makes me wonder if this is one that's had a chunk taken out of it, it looks very disorganised.

David Fenwick Snr Yes having no mantle would be very weird indeed and weird for it to have even survived. It's actually here now still happy crawling round a collection tube. Looking closely at it there is a flap of tissue on its top and the tissue looks asymmetrically attached which might suggest damage of some kind. So my apologies to you all it does look like it's going to be a damaged Berthella plumula. Glad I don't find too many damaged slugs.

Steve Trewhella Upside down Berthella plumula.

Bernard Picton Very funny Steve! I think you are right David Kipling, the mantle is missing.

Judith Oakley Berthella plumula spawning today on the Gower peninsula, South Wales (plus 2 x Asterina phylactica top left).

João Pedro Silva Next time try to shoot with the animal completely submerged (no more than 2cm of water above the animal). Even if you're at the surface, the results will be far better. http://www.flickr.com/photos/49844432@N08/6974170177/

Judith Oakley Thanks. I know, João Pedro Silva, but I was busy surveying a different animal species at the time, and just happened to see this. I didn't have my underwater camera with me either!

João Pedro Silva The photo above was taken with a land camera without a housing.

Message posted on NE Atlantic Nudibranchs on 30 Jun 2013
Judith Oakley Berthella plumula spawning today on the Gower peninsula, South Wales (plus 2 x Asterina phylactica top left).

Message posted on NE Atlantic Nudibranchs on 30 Jun 2013
João Pedro Silva Berthella plumula Local: Arrábida, Portugal Spot: Alpertuche Profundidade: 5m Data: 23-01-2012

Message posted on Nudibranquios on 15 Sep 2013
David Kipling Probably will only see these on a dive if you're shallow and turn rocks over.

Cynthia D. Trowbridge I have seen them intertidally under rocks in Ireland (Lough Hyne)

Tony Gilbert Great Berthella shot.

Tony Gilbert I've yet to spot the eggs, very similar to other species in size/shape colouration. If the Pleurobranch wasn't there I'd be mistaken in thinking the eggs were either Hypselodoris or Archidoris. In Lanzarote Canaries, there are also Berthella species, namely B. edwardsi, although I think B.plumula may also be present. http://www.flickr.com/photos/tonyjgilbert-images/7164315073/in/photostream Like yourself, as soon as light is thrown upon them they are quickly off into darkness. So, we only see them during night dives in the darkest of hidden places like caves.

João Pedro Silva I've never seen the eggs of Berthella plumula nor B. stellata, which I suppose have similarly shaped egg masses. Those of Berthellina edwardsii are quite different from those in David's photo: http://www.flickr.com/photos/jpsilva1971/5718907181/

Message posted on Seasearch Identifications on 28 May 2012
Patrik Good New species for my Gold Coast Seaway (Australia) collection. Berthella splendida; 4/5/2013; 19:02 hrs; size 10mm; depth 2 metres; 24 degrees water temperature; 3 metres visibility. The two eyes are visible from under the mantle on the base of the rolled rhinophores. As expected lots of branchs are making their comeback to the Seaway at the moment.

Gary Cobb I am sure you meant Berthella stellata!

Patrik Good Sure, Gary, had my head already with a few other ID issues.

Lucas CerCur This specimen resemmbles very much to Berthella plumula also. This species is not described with white pigmentation on the mantle, but...this could be a variation only. In fact, one of the sysnonyms of B. plumula is B. porosa. Could you see the "porous" appearance of this animal?

Lucas CerCur It should be studied to be sure.

João Pedro Silva The similarities are striking; http://www.flickr.com/photos/jpsilva1971/6751561325/

Gary Cobb The white stingy lines coming from the body up into the mantle show that this is B. stellata. Patrik has a great side shot with this.

Gary Cobb Patrik where is your new album?

Lucas CerCur I know the paper in which several specific Berthella names were synonimyzed with B. stellata. This was in 1987. So, more tan 25 years ago. Manuy viwes have changed from that time.

Lucas CerCur Sorry, "many things have...

João Pedro Silva In due time, molecular studies will sort it out.

Gary Cobb Amen

Gary Cobb Patrik where is the side shot??

Lucas CerCur J Pedro is right.

Patrik Good Interesting. I took about 200 raw pictures of this critter, underside, left, right, top. The critter was pretty transparent. It lay eggs in its short captivity and finished that task in about 20 minutes. Unfortunately I forgot to take a picture of the egg mass. It was a round tubular mass, diameter about 8mm. Will check out the paper and if I can see any porous appearance. The only difference to the B. stellata on the net was that the eye position seemed wrong. Who or what institution is doing research on this critter at the moment?

Lucas CerCur The synonimyzation of several Indopacific names with B. stellata was carried by Gosliner and Behrens in 1988 (I think), and it was published in The Veliger.

Alvaro Borba Interesting! Here on the coast of Maceió found many individuals of this species Berthella agassizii (MacFarland, 1909).

Patrik Good Typo: specimen was found May 3.

Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Heterobranchia (Subclass)
        Opisthobranchia (Infraclass)
          Pleurobranchomorpha (Order)
            Pleurobranchoidea (Superfamily)
              Pleurobranchidae (Family)
                Berthella (Genus)
                  Berthella plumula (Species)
Associated Species