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Lamellaria perspicua

(Linnaeus, 1758)


Paula Lightfoot Lamellaria perspicua? Another example for David Kipling of things that look like squirts that aren't squirts!

David Kipling And not only eats squirts but lays eggs in them! Euww.

Claire Goodwin That is a good one Paula!

David Kipling Apparently both this and L latens mimic compound ascidians, even down to different inhalent and exhalent opening sizes. That's not playing ball, squirts are hard enough as it is! http://www.conchsoc.org/spAccount/lamellaria-latens http://www.conchsoc.org/spAccount/lamellaria-perspicua

Simon Taylor Nice image Paula. I've seen these on weed at low tide perfectly mimicking ascidians, to the extent that the only way to tell them apart was that if they detached from the weed easily then they were snails.

David Kipling Looks like a tatty bit of a kelp holdfast to me! (ducking)

David Kipling Simon .. do you have any pics of either of the Lamellaria UK species that you could post? These are new to me.

George Brown https://www.facebook.com/photo.php?fbid=4620558964694&set=o.166655096779112&type=3 This photo generated some discussion.

Simon Taylor David - Sadly my photographic abilities are very limited. I'm always very interested to see images of Lamellaria though (hint hint to others) as the two British species have caused me headaches over the years. In my experience, and from what I've heard from others, they are very variable in colour and texture. As Ian Smith hints in the discussion of George's image, overall size is a good pointer, perspicua having a larger maximum size than latens. The internal shells can be fairly conclusive but of course require careful dissection.

Jim Anderson I've got a couple here http://www.nudibranch.org/Scottish%20Nudibranchs/lamellaria-perspicua.html

Ian Smith If a Lamellaria, the Calliostoma indicates it's size to be of a L. perspicua. Very varied species, but I've never seen one like this. Paula, did you see its siphon or foot, or pick it up? Otherwise, I'd hesitate to record it as David's kelp suggestion is a strong possibility - the "exhalent openings" could be where holdfast "roots" have broken off.

Paula Lightfoot well obviously what I meant to say was "here's a piece of kelp pretending to be Lamellaria pretending to be a squirt!!" not at all sure now, so i'd better not record it, should have gone to specsavers! David I will share the definite photos with you (although you could use this too as it does look like a squirt ;-)

Message posted on British Marine Mollusca on 10 May 2013
Ian Smith Ventral and dorsal views of Lamellaria perspicua male (not an opisthobranch; separate sexes). White penis with robust side-arm to right of head, protrudes beyond mantle edge. Late June, Menai Strait.

Message posted on NE Atlantic Nudibranchs on 10 Jul 2013
Erling Svensen I know that this one is not a nudi, but still. Anybody knows it? Only 1 cm long, in the red seaweed. 8 meters dept.

Paula Lightfoot Could it perhaps be Lamellaria perspicua? http://www.conchsoc.org/spaccount/lamellaria-perspicua

Message posted on NE Atlantic Nudibranchs on 01 May 2012
George Brown Not a nudibranch but is this Lamellaria perspicua? Feeding on ascidians growing on sea grass Zostera marina. 2012-12-01, Ord, Isle of Skye, depth 2.0 metres.

Erling Svensen I think you have the right name, George Brown.

Egidio Trainito Right

Ian Smith Hi George Brown the white ground colour with fine black stipple, low profile and not very prominent tubercles make me think it is L. latens. If it was over 10mm long, I'm wrong. See http://www.conchsoc.org/spaccount/Lamellaria-latens and the perspicua account on same site. Cheers Ian

George Brown Hi Ian. It was your comments that pointed me to L. perspicua particularly the way the head tentacles lie. I should say that it was approximately 15mm long. I knew there was something I forgot to add! Great site btw, and excellent photography. My photo was taken with an Aquatica +5 dioptre. What did you use for your Lamellaria photos if you don't mind me asking?

Ian Smith Hi George If you are sure it was 15mm, perspicua is indicated. Looking carefully at your image I think I can see other latens features apart from those I mentioned. In the posterior half, the mantle, where it is clear of the underlying shell, has faint greyish discs delineated by surrounding whitish pigment, and round the periphery of the mantle I think I can make out a few yellowish white marks, especially near the posterior. I think this is a case where measurement, and examination of the shell would have been helpful. On latens, and some pale perspicua, you can often see the outline of the shell if you examine it with back lighting. In perspicua the spire protrudes from the general oval outline, on latens it doesn’t protrude. In the Conch Soc latens account, the features described are mentioned in various other written sources, except the angle of the tentacles which is from my observations. It needs to be seen from above as the angle alters when viewed obliquely, and is not diagnostic as the tentacles can be moved; the tentacles of latens are more often held at a wide angle, but not always. Apart from the shell spire, the most reliable feature, mentioned in NF McMillan’s account, is probably the fine black/sepia stipple which I think I can see on your photo. Thanks for your kind words about the Conch Soc site. I’ll answer about photography in a separate message. Cheers Ian.

Ian Smith Hi again George Thanks for your comments about my photography, but I think it is less skilled than what you and others do underwater. Mine is table top photography where I can control the substrate’s level and colour, the posing of the subject, the clarity of the water and the positioning of the lighting. I followed Bernard’s good advice and, allowing for model changes before I bought, use Nikon D300s camera, AF Micro-Nikkor 60mm f2.8D lens, two wireless “speedlights”, and a tripod with rack and pinion column which I use to focus (manually) keeping the lens at maximum extension (1:1 ratio). I think the lens has been discontinued, but can still be obtained. It has a short working distance, ok for table top, but perhaps not so easy for divers. The lighting often shows up detail not seen in the field; which I suppose may be considered a disadvantage for helping field recognition. Have a look at the Conch soc Runcina coronata images. The images taken in rock pools show dull blackish creatures, while the table top ones show bright yellowish markings. Cheers Ian http://www.conchsoc.org/spaccount/Runcina-coronata

Lucas CerCur Ahhhh!!!! Runcina. This should be one of the projects that should be carried in all around Europe.

Ian Smith Hi George Brown , I have recalled that I found a white Lamellaria like yours at Weymouth last April. It was ambiguous as it had markings usual for L. latens and, at 11mm long, it was just over the 10mm approximate maximum for L. latens. The shell showed clearly that it was L. perspicua. The account at http://www.conchsoc.org/spaccount/lamellaria-perspicua has been amended in the light of our finds. I have embedded links to relevant images at [14], [15] & [16], and altered the text near the embeds. The quickest way to find the images is to click GALLERY link below the thumbnails; they are the last three images on the gallery (click the images for captions). Cheers Ian

Message posted on NE Atlantic Nudibranchs on 09 Dec 2012
Paula Lightfoot This is not a nudibranch (sorry!) but it looks a lot like one...found on the wall of Gouliot Cave on Sark last week, 5mm long with a rough textured cream/brown mantle over an internal shell. I think it is either Lamellaria perspicua or Lamellaria latens, but can anyone tell me which one?

David Fenwick Snr Hi Paula, Hayward and Ryland describes L. latens as less domed in profile and from my observations on the shore I would say that this is true even for juvenile animals. From what I've seen at Hannafore, Spit Point and Marazion (Cornwall coast) juvenile L. latens are flatter than L. perspicua, with the latter being 'cowrie' shaped in profile. If I had to sort 5mm forms of these two on profile alone I would say that L. latens had a greater colour range. Hope this helps and hope others will agree.

Message posted on NE Atlantic Nudibranchs on 12 Apr 2012
Erling Svensen Could this be some kind of barnacles? Norway yesterday evening.

Marco Faasse Sure! Verruca stroemia. Here we call it (translated): zipper barnacle. You see why :-)

Erling Svensen Thanks a lot Marco. A new species on the list. Need to buy a botle of red wine......

Ian Smith http://www.flickr.com/photos/56388191@N08/sets/72157629143972722/

Jane Pottas I recognise them as V. stroemia but I like the name zipper barnacle!

Marco Faasse Congrats, Erling! Keep searching. Always good to find a reason to open a bottle. If I can help to find new species ...

Erling Svensen You are welcome to Norway to help searching.....

David Kipling Ian ... that flickr set is excellent, the way you use the embedded dynamic annotation of the pictures is great, not seen that before!

Ian Smith Thanks David. There have been big changes to Flickr recently: Free storage for about half a million images per person. All users can now arrange images in "collections" of "sets" for free. Sadly the "collections" button is hard to find; users need to click on the 3 dots at top right to get a drop down menu with it on. My collections (barnacles - set each for the 9 littoral UK spp. and gastropods - set each for 4 small spp. ;more to come) are at http://www.flickr.com/photos/56388191@N08/collections/

David Kipling Erling's zipper photo for Inga Williamson, plus do have a look at Ian's flickr album, it has some cool feature. Oh, and welcome to Seasearch ID ;)

Inga Williamson Thanks David - great picture indeed

David Kipling Ian, Erling ... I've never seen these in the UK but there are loads of records. What sort of depth/habitat do you find them?

Ian Smith Low water, Fucus serratus zone downwards. Often on F. serratus and often UNDER stones - look crushed. On Menai Strait often common but invisible under sponge, except for red gape when open. I found a Lamellaria perspicua with a good imitation of the gape and sponge (pic on Conch Soc site). Verruca stroemia is such a distinctive sp. with its chevron pattern of grooves/ridges that I think records will be ok, but a similar Verruca sp. in Mediterranean needs inspection of underside of opercular valves to differ.

David Kipling I shall have to have a hunt!

Ian Smith Southward says to 500 metres. Moment of self doubt -I THINK it occurs on F. serratus, but my memory might be confusing it with Balanus crenatus. Will check on my next visit. Certainly likes under stones, but not exclusively.

David Kipling 500m deep?!?

Ian Smith Well NBN does have a saltmarsh sp recorded on the Brecon Beacons :-)

Message posted on Seasearch Identifications on 11 Jul 2013
Dan Bolt My third and final head-scratcher from today's snorkelling trip to Babbacombe. Probably not a Nudibranch but a mollusc with an internal shell maybe? Anyway, I've no idea what it is! 10mm long ish.

Christian Skauge Cute little thing! Could be a Pleurobranchus membranacea, but these things are a little hard to identify...

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

Bernard Picton This one isn't an Opisthobranch, but a Prosobranch. It's Lamellaria perspicua. They are very variable in colour and not easy to distinguish from Lamellaria latens, but in my experience L. latens has a different range of markings (as well as a slightly different (internal) shell.

Dan Bolt Thanks again Bernard!

Message posted on NE Atlantic Nudibranchs on 03 Mar 2012
Kerry Lewis

Kerry Lewis Hi all, got a few queries in this little lot... thanks!

Kerry Lewis Thanks Dawn. Hope I've fixed it!

Ian Smith Not fixed for all members of seasearch group. Only your "friends" can write a comment on the photos as they are uploaded onto your Facebook page instead of to this group. IMO Bernard's suggestion of Lamellaria perspicua for the last image is correct - I can make out its siphon on the right.

Kerry Lewis Hi Ian, can i load a whole album directly to this group, or just a single photo? Thanks for your comment!

Ian Smith Hi Kerry Lewis I see from your later uploads that you have figured it out- nice set of pics.

Message posted on Seasearch Identifications on 07 Jul 2013
Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Caenogastropoda (Subclass)
        Littorinimorpha (Order)
          Velutinoidea (Superfamily)
            Velutinidae (Family)
              Lamellaria (Genus)
                Lamellaria perspicua (Species)
Associated Species