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Lacuna pallidula

(da Costa, 1778)


Cat Wilding These eggs were found on the rocky shore at Polzeath this weekend, does anyone have any idea what might have laid them?

David Kipling Size? And what are they laid on?

Cat Wilding about 3/4mm across, laid on saw wrack. A few nudibranch species found on the day

David Kipling Does look like mollusc eggs - what nudis did you see?

Cat Wilding Sea hare and another, have to check what it was.

Douglas Herdson Are they Flat periwinkle - Littorina obstusata/mariae/littoralis?

Cat Wilding aeolidia papillosa

Douglas Herdson Aeolida are larger pink and wavy.

Cat Wilding they are raised, like tinyturquoise donuts

Paula Lightfoot Lacuna vincta eggs?

Cliff Benson Hi Doug, Hope you are well have you had anything to do with I spot a BBC OU thing seems quite good fun!

Cat Wilding Oooh Paula Lightfoot, nice one, that looks bang on! Interestingly not currently listed by Marlin as having any records from the North Cornish coast... :)

Paula Lightfoot Interesting records then, well done! Did you see the adult snails as well or just eggs? http://www.conchsoc.org/spAccount/lacuna-vincta

Ian Smith My first inclination was, like Paula, to Lacuna vincta, but the colour made me look it up in Fretter & Graham, Brit. Prosobranch molluscs (1962). Firstly, Littorina obtusata/mariae spawn is not doughnut shape; it is kidney shape or circular. The latter shape is sometimes confused with spawn of Lacuna pallidula (inverted watch glass shape). F&G say of Lacuna vincta spawn "It forms the familiar yellow rings which may be found from Jan. to early summer on various weeds; Lebour stated that other egg masses of similar shape which are pink or green almost certainly belong to another species." F&G said that the spawn of other British Lacuna spp. had not been described. Maybe Cat's is one of them. But difficult to rear to find out as they hatch as veliger larvae that live in the plankton. Or Lebour might be mistaken.

Cynthia D. Trowbridge Certainly look like Lacuna to me :-)

Message posted on Seasearch Identifications on 04 Mar 2013
Taxonomy
Animalia (Kingdom)
  Mollusca (Phylum)
    Gastropoda (Class)
      Caenogastropoda (Subclass)
        Littorinimorpha (Order)
          Littorinoidea (Superfamily)
            Littorinidae (Family)
              Lacuninae (Subfamily)
                Lacuna (Genus)
                  Lacuna pallidula (Species)
Associated Species