Glans trapezia (Linnaeus, 1767)
Algarve to Gabon, Mediterranean. Intertidal to at least 120m deep, on various soft sediments.
Original taxon: Chama trapezia.
Above and below: dredged at 45m deep, off Protaras, Paralimni, Famagusta, SE. Cyprus. 7-7mm.
« Shell trapeziform, whitish, sparingly spotted with black ; ribs eighteen in number, finely crenulated ; lunule rather large ; ligamentary area depressly flat. » – L. A. Reeve: Conchologia iconica vol. I, London 1843, via BHL.

Synonyms: muricata, squamosa.
Some named variants: albida, rosea, sulphurea…
Capraia island, Livorno, Toscana, NW. Italy. 8mm.
Cardita trapezia in S. Clessin: “Die Familie der Carditaceen”, Systematisches Conchylien-Cabinet Bd.10:Abt.1, Nürnberg 1888.
Variant ex colore “sulphurea” from 12m deep, Scilla, Messina Strait, SW. Italy. 4,5mm.
Variant ex colore “rosea” Bucquoy, Dautzenberg & Dollfus.
70m deep, Saronic Gulf, E. Greece. 7,75-8mm.
Original pictures provided by P. Ovalis (GR).
– CC BY-NC-SA) –
The hinge in a trapezia from SE. Greece. Notice the well developed anterior and posterior laterals.
Top: left valve. Bottom: right valve.

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