Waisiuconcha sp. 1

Kiel, Steffen, Aguilar, Yolanda M. & Kase, Tomoki, 2020, Mollusks from Pliocene and Pleistocene seep deposits in Leyte, Philippines, Acta Palaeontologica Polonica 65 (3), pp. 589-627 : 613

Waisiuconcha sp. 1

Fig. 27A–C .

Material.— Three specimens from the Pliocene of Liog-Liog Point ( NMNS PM 28420–28422 ) .

Dimensions (in mm).—NMNS PM 28420, L = 4.5, H = 3.5.

Remarks.—Compared to the holotype of Waisiuconcha alberdinae Beets, 1942 ( Beets 1942: figs. 147–151), Waisiuconcha sp. 1 from Liog-Liog Point has a more acutely rounded posterior margin, the anterior adductor muscle scar is more elongate than the diamond to drop-shaped scar of W. alberdinae , the pallial line starts at the base of the anterior adductor scar rather than on its posteroventral side, and the pallial line is closer to the shell margin as in W. alberdinae . The two extant species W. surugensis Habe, 1976a and W. haekeli Cosel and Salas, 2001 have shorter shells than Waisiuconcha sp. 1 from Liog-Liog Point ( Habe 1976a; Cosel and Salas 2001; Hoffman et al. 2019).

Figures

Fig. 27. Two species of the vesicomyid bivalve genus Waisiuconcha Beets, 1942, from the late Pliocene (A–C, Liog-Liog Point) and early Pleistocene (D, E, Cambantug Point) seep deposits in Leyte, Philippines. A–C. Waisiuconcha sp. 1. A. NMNS PM 28420, articulated specimen, dorsal view showing lunular incision (A1), view on outer side of left valve (A2). B. NMNS PM 28421, articulated specimen with partically removed shell, view on outer side of left valve B1), anterior view showing anterior adductor muscle scars (B2). C. NMNS PM 28422, isolated left valve, showing hinge dention. D, E. Waisiuconcha sp. 2. D. NMNS PM 28423, an isolated right valve partially embedded in rock matrix, showing hinge dentition (D1), view on outer side (D2), in dorsal view showing lunular incision (D3). E. NMNS PM 28424, an isolated left valve, showing hinge dention (E1) and irregular outer surface sculpture (E2).