Gastrana fragilis (Linnaeus, 1758)
Norway & Baltic to Canarias, Azores to Mediterranean & Black Sea. Intertidal down to circa 40m deep, in silty sediments. In shallow water, it is often encountered near freshwater inlets.

Original taxon: Tellina fragilis.
Synonyms: jugosa, striatula, tarentina
10m deep, Vranjic, Split, S. Croatia. 48mm.
Original picture provided by N. Lete (HR) – (CC BY-NC-SA).
On beach, east of Skala Kallonis, Mytilini island, North Aegean, Greece. 27mm.
1-4m deep, on muddy gravel with patches of Posidonia oceanica, 100m north off eastern end of the dam, Elounda lagoon, NW. of Kolpos Mirabelou, Lasithi, Crete. 15-24mm.
Dead collected on muddy sediments at 10m deep, at base of the slope of pebbles, southern bay, Dimos Archaias Epidavrou, NE. Peloponnese, Greece. 23mm.
Diodonta fragilis drawn in Forbes & Hanley: British Mollusca vol. I plate IV, London 1853, via BHL.
 
« Shell triangular, considerably produced at the posterior end, more convex towards the beaks, rather thin but opaque, somewhat glossy when young but afterwards becoming lustreless. Sculpture, more or less irregular, thin, concentric ridges or laminae, which are slightly imbricated on the posterior side, besides numerous minute and close-set parallel striae in the interstices of the ridges ; the whole surface is also covered with fine longitudinal striae which radiate from the beaks, and are three times as many as the transverse ridges, but very much more slight and scarcely raised ; where these cross the ridges the crests of the latter are indistinctly beaded. Colour pale yellowish-white. Epidermis fibrous, usually worn off and only visible near the beaks and at the edges of newly-formed layers. Margins curved, but not deeply, in front, nearly semi-circular on the anterior side, acutely angular but bluntly pointed at the posterior end, whence there is a long and nearly straight slope backwards. » – G. J. Jeffreys: British conchology vol. II, London 1853, via BHL.
The species at Llanbedrog, Llyn Peninsula, Wales.

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