Pseudochama gryphina (Lamarck, 1819)
Portugal to Angola and offshore islands, Azores to Mediterranean. Cemented to hard substrate or other shells, subtidal to sublittoral. Original taxon: Chama gryphina.
 
« Chama gryphina: testâ sinistrorsâ, imbricatâ ; squamis valvae minoris, inaequalibus, plerisque appressis ; margine partim crenulato. […] This shell seems to take after the Ch. gryphoides ; however, its peak turns counterclockwise. » – J.-B. de Lamarck: Histoire naturelle des animaux sans vertèbres vol. VI part 1, Paris 1819, via BHL.

3m deep, on wall of crevice, San Damianu marina, Calvi, NW. Corsica. 40mm.
Chama gryphina in L. A. Reeve: Conchologia iconica vol. IV, London 1847, plate VIII.
 
« Shell semiorbicular, circuitously triangular, affixed by the side, both valves concentrically laminated, laminae pressed down, fimbriated and erect on the anterior side. Only known to Lamarck in a fossil state. » – op. cit.
Synonyms: cornuta, sinistrorsa (conterclockwise), virens.
Two gryphina from Gorée island, off Dakar, Sénégal. 19-24mm.
Comparison between Pseudochama gryphina (7) and Chama gryphoides (5,6) in J. G. Hidalgo: Moluscos marinos de España, Portugal y las Baleares, Madrid 1870,via BHL.
A specimen from Chalkída, western Évvia island, Central Greece. 30mm.

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