Emarginula fissura (Linnaeus, 1758)
N. Norway to Canarias, Madeira and lusitanian seamounts to Mediterranean. Predator on sessile preys (sponges) in rocky environment, from the low intertidal to the continental shelf. Jeffreys: « Everywhere on shells and stones, from low-water mark at spring tides to 90f. ; off the Mull of Galloway in 110-145f. (Beechey). […] This variety also occurs in the Red Crag ; it is nearly as high as long » (Brit. Conch. vol. III).

Original taxon: Patella fissura.
600m deep, Isola di Ponza, Latina, Lazio, W. Italy. 7mm.
Synonyms: conica, emendata, fissurata, reticulata
Specimen from English Channel: 30m deep, Paimpol bay, Côtes d’Armor, N. Brittany, NW. France. 7mm.
The most strongly cancellate and high-spired of all the european members of the genus Emarginula with an apex not overhanging the posterior margin. The primary radial ribs, crossed by concentric cords of a substantially same strength, are separated from each other by a thin and sometimes sharp crest, less elevated. Apex smooth, reflected.

70m deep, Cagliari, S. Sardinia. 12,8mm. Original pictures provided by A. Nappo (IT) for WoRMS – (CC BY-NC-SA).
The species in J. Thiele: “Scissurelliden und Fissurelliden”, Systematisches Conchylien-Cabinet Bd.2:Abt.4a, Nürnberg 1912, plate VI fig.4-5.

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