Parvicardium pinnulatum (Conrad, 1831)
Arctic to S. Atlantic, Baltic, Mediterranean.
On sediments, subtidal to bathyal depths. Suspension feeder.
Original taxon: Cardium pinnulatum.
Synonyms: fasciatum, hudsoniense, ovale.
 
« Pelagic. This is found plentifully, in Casco Bay. It seems to be the favourite food of the haddock, as it is rare to find that fish without more or less of this shell in its stomach. I think I have taken more than a hundred out of a single individual. It occurs on all the coast, and as far north as Labrador. » – J. W. Mighels: “Catalogue of the marine, fluviatile and terrestrial shells of the state of Maine and adjacent ocean”, Boston journal of natural history vol. IV art. XXVI, Boston 1843.

16m deep, Málaga, Andalucia, S. Spain. 12mm.
Cardium pinnulatum (8) in T. A. Conrad: “Description of 15 New Species of Recent, and 3 of Fossil Shells, chiefly from the coast of the United States”, Journal of the Academy of Natural Sciences Vol. VI part II, Philadelphia 1830, via BHL.
 
« Shell sub-orbicular, small, thin, and fragile; ribs about 26, flattened but becoming convex towards the base, where they are generally muricated with a single row of minute, equidistant points; colour whitish or pale brown. »
Pale specimen from NE. Aegean: 120m deep, Bozcaada island, Çanakkale province, W. Marmara, NW. Turkey. 10mm.

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