Acila, Adams and Adams, 1858

Kiel, Steffen, Hybertsen, Frida, Hyžný, Matúš & Klompmaker, Adiël A., 2020, Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru, Acta Palaeontologica Polonica 65 (1), pp. 109-138 : 111-112

Acila ? sp.

Fig. 2B .

Material.— One specimen ( NRM Mo187002, W = 10.5 mm) from the Oligocene Belén seep site, northern Peru .

Remarks.—Judging from the divaricate ornament, this specimen appears to belong to Acila , but as other diagnostic features, such as the hinge, are missing, it is here hesitantly assigned to this genus. Olsson reported two species of Acila from Belén and Pajarabobo, Acila paita Olsson, 1931 , and Acila piura Olsson, 1931 . The specimen that we collected is too poorly preserved to be identified as either of these species.

Figures

Fig. 2. Protobranch and pteriomorph bivalves from early Oligocene seep deposits from the Cerro La Salina (block 1, A; block 6, D; block 9, C) and Belén seep deposit (B), Talara Basin, northern Peru. A. Malletiid Neilo altamirano sp. nov. (NRM Mo187001, holotype), internal mold in lateral view (A1); external mold in lateral view (A2), arrows indicating the posterior ridge; view on the dorsal side (A3); close-up on the taxodont hinge dentition (A4). B. The possible nuculid Acila? sp. (NRM Mo187002), external mold of outer shell surface. C. The bathymodiolin Idas sp. (NRM Mo187003), internal mold of the entire specimen (C1), arrow indicating the taxondont teeth; close-up on taxodont teeth on posterodorsal shell margin (C2). D. Propeamussiidae indet. (NRM Mo187004), uncoated specimen showing internal radial ridges (D1); specimen coated with ammonium-chloride, highlighting external sculpture (D2).