Isorropodon cf. perplexum Sturany, 1896

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 : 607

Isorropodon cf. perplexum Sturany, 1896

Fig. 19B–E .

Material.— Six specimens from the Pliocene of Liog-Liog Point ( NMNS PM 28414–28416 , and NMNS PM 28418 , representing three specimens) ; one specimen from the Pleistocene of Cambantug Point ( NMNS PM 28417 ) .

Dimensions (in mm).—NMNS PM 28415, L = 10.0, H = 7.8; NMNS PM 28416: L = 11.0, H = 8.5.

Remarks.—The available specimens are virtually indistinguishable from the syntypes of I. perplexum as illustrated by Cosel and Salas (2001: figs. 33–35), but with the hinge dentition of the Philippine specimens unknown, we only hesitantly assign them to the extant Mediterranean species I. perplexum .

Figures

Fig. 19. Small vesicomyid bivalves from late Pliocene (B–D, Liog-Liog Point) and early Pleistocene (A, E, Cambantug Point) seep deposits in Leyte, Philippines. A. Vesicomya nakaii Okutani, 1961, NMNS PM 28413, isolated left valve, view on outer side. B–D. Isorropodon cf. perplexum Sturany, 1896. B. NMNS PM 28414, small left valve, outside view (B1) and dorsal view (B2). C. NMNS PM 28415, isolated left valve, insight view (C1); close-up on hinge (C2). D. NMNS PM 28416, isolated right valve, view on outer shell surface. E. Isorropodon cf. perplexum Sturany, 1896, NMNS PM 28417, left valve with shell broken off, showing anterior adductor muscle scar.