Equichlamys Iredale, 1929

Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), Records of the Australian Museum (Rec. Aust. Mus.) 70 (2), pp. 113-330 : 232

Equichlamys Iredale, 1929

Equichlamys Iredale, 1929: 162 . Type species (by original designation): Pecten bifrons Lamarck, 1819 ; late Pliocene to Recent, southeastern Australia.

Diagnosis. Plicate Pedini with aequipectinoid shell shape, inflation of valves almost equal, acline or weakly prosocline, auricles almost equal in size; coarse shagreen microsculpture present throughout ontogeny; internal rib carinae prominent; hinge with prominent resilial and dorsal teeth; byssal notch shallow, ctenolium obsolete or lacking in late ontogeny.

Distribution. Late Pliocene–Recent (Beu & Darragh, 2001). Southeastern Australia, living in the littoral to sublittoral zones on soft sediment (muddy sand or sand) with seagrass beds.

Discussion. Hertlein (1969: N357) treated Equichlamys as a subgenus of Chlamys Röding, 1798 in the Chlamys group. Waller (1991: 30) considered it to be a representative of the suprageneric Chlamys group or, more recently, in Chlamydini (i.e., Pedini ) ( Waller, 1993, 2006a).

Waller (1991: 30) compared the morphological convergence of Equichlamys and Notochlamys and suggested that the two are not closely related and have different ancestries. As Equichlamys and Notochlamys are almost the only examples of internally carinate Pedini , they provide examples of Pedini that have evolved internal rib carinae independently from non-carinate ancestors. For biostratigraphy of Equichlamys see Beu & Darragh (2001).