Thracia phaseolina (Lamarck, 1818)
Iceland & Norway, Baltic, to Angola; Azores to Mediterranean. A similar species, if not the same, occurs in the Gulf of Mexico.
Lives in sand, muddy sand and muddy gravel, from the low intertidal down to shelf depths (MBSBI).
Original taxon: Amphidesma phaseolina. Previously known under the epithet of papyracea Poli, junior synonym of a papyracea by Gmelin and thus invalid.
Above and below:
70-80m deep, off Málaga, Andalucia, S. Spain. 26-30mm.
« The little boat Thracia: Shell oblong, slightly convex, thin, fragile, posteriorly concavely angled, subtruncated, anteriorly attenuately oval ; concentrically finely striated ; white, comparatively shining, scarcely scabrous. » – L. A. Reeve: Conchologia iconica, London 1860, via BHL.

Other synonyms: declivis, mitella, textilis
Beachstormed young specimens, collected near the northern sea-wall, Port-la-Nouvelle, Occitania, S. France. 11-20mm.
Specimens from Irish Sea. On sand at low tide, Ainsdale Beach, Southport, Lancashire, western United Kingdom. 21,5-24mm.
Specimens from western Baltic: at low tide on beach, Hulsig Strand, Ålbaek Bugt, Frederikshavn, Nordjylland, E. Denmark. 24-27mm.

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