Papillicardium minimum (Philippi, 1836)
Iceland & Norway, via the western coasts of the British Isles, to Cabo Verde & Mediterranean. In sediments across the shelf.
Original taxon: Cardium minimum.
Synonyms: suecicum, suediense…
Above and below: 250m deep, Estepona, Málaga, Andalucia, S. Spain. 2,5-3,5mm.
« The Swedish Cockle: Shell minute, orbicular, thin, fragile, radiately ribbed, ribs eight and twenty in number, convex, prickly ; white, covered with a thin straw-coloured epidermis. » – L. A. Reeve: Conchologia iconica vol. II, London 1843, via BHL.

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