Bathyarca pectunculoides (Scacchi, 1835)
Greenland to Massachusetts, Iceland, northern Norway to Cabo Verde archipelago, Azores and atlantic seamounts to Mediterranean. Attached to small stones and gravels by a thin byssus. Continental shelf edge down to bathyal depths.
Original taxon: Arca pectunculoides.
Synonym: crenulata.
Dredged in Northern Tyrrhenian Basin, W. Italy. 3mm.
The valves are more rounded than in philippiana, with a good crenulate sculpture of constant strength all along the surface.
200m deep, off Dubrovnik, S. Croatia. 3,1mm. Original picture provided by R. Stanić (HR) – (CC BY-NC-SA).
« Arca falso pettuncolo. – Testa parva, rotundata subaequilatera, gibba, natibus inflexis, striis transversis exiguis, striis longitudinalibus vix conscpicuis decussatis, cardine lineari utroque sine tridentato, margine integro. Alta aeque ac lata lin. 1 1/2. » – A. Scacchi: “Notizie intorno alle conchiglie ed a’ zoofiti fossili […] di Gravina in Puglia”, Annali Civili del Regno delle Due Sicilie vol. VI p. 82, Napoli 1835.

Gioia Tauro, Reggio Calabria, SW. Italy. 2,6mm.
Above and below: juvenile from 80m deep, hvarski kanal, Split-Dalmatia Comitat, S. Croatia. 2,6mm.
The hinge shows two lateral lamellae per side, and a series of very weak crenations in the cardinal area.
Large adult trawled at 100m deep, off Nova Scotia. 7,8mm.

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