Pandora pinna (Montagu, 1803)
British Isles to northwest Africa, to Mediterranean.
Original taxon: Solen pinna. Synonyms: obtusa, pinnoides.
150m deep, South Adriatic. 18mm. Original pictures provided by N. Lete (HR) – (CC BY-NC-SA).
« Solen pinna: Solen with a thin, pellucid, fragile, depressed, white shell, of a sub-oval shape, strongly wrinkled concentrically ; umbo small, placed very near the smaller end, from whence the connecting cartilage runs in a straight line on the longest side, and joins the valves nearly the whole width of the shell, like a Pinna ; the short end declines a little from the beak ; the margin opposite the hinge is semi-circular, and extremely thin and brittle ; the valves are dissimilar, the upper is a little convex, the lower slightly concave. Inside white, somewhat pearlaceous ; a blunt tooth in each valve running straight from the beak ; that in the concave valve is largest, and uneven on its furface ; these are not inserted, but stand by the side of each other when the valves are closed. » – G. Montagu: Testacea brittanica vol. II, London 1803, via BHL.
100-110m deep, off Motril, Granada, Andalucia. 19mm.
Specimens from English Channel:
Extreme low tide in sand, St-Benoît des Ondes, S. of Cancale, Mount St-Michael bay, N. Brittany, NW. France. 22mm.
large specimen collected at extreme low tide in sand, west of Les Ébihens island, Pointe du Chevet, St-Jacut de la Mer, N. Brittany. 32mm.
A juvenile from 150m deep, South Adriatic. 4,5mm. Original pictures provided by N. Lete (HR) – (CC BY-NC-SA).

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