Elliptiolucina ingens Okutani, 2011

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 : 598-599

Elliptiolucina ingens Okutani, 2011

Fig. 9 .

2011 Elliptiolucina ingens sp. nov.; Okutani 2011: 116, figs. 1A, 2, 3.

Material.— Two specimens from the Pliocene of Liog-Liog Point : NMNS PM 28117 , an isolated right valve; NMNS PM 28121 , an isolated right valve .

Dimensions (in mm).— NMNS PM 28117, L = 91.0, H = 75.8; NMNS PM 28121, L = 92.4, H = 75.4.

Remarks.—The available specimens from Liog-Liog Point vary regarding the angle at which the anterior adductor muscle scar (aams) deviates from the pallial line. Whereas the aams deviates widely from it in specimen NMNS PM 28121 ( Fig. 9C ) as in the holotype of E. ingens , it is very close to the pallial line in specimen NMNS PM 28117 ( Fig. 9B ). Although the extant E. ingens is known only from the holotype and intraspecific variability cannot be assessed, for now we consider the observed differences in deviation of the aams as intraspecific variation.

Stratigraphic and geographic range.—Late Pliocene: Leyte, Philippines. Recent: East China Sea.

Figures

Fig. 9. The lucinid bivalve Elliptiolucina ingens Okutani, 2011 from the Pliocene Liog-Liog Point seep deposit in Leyte, Philippines. A. NMNS PM 28118, a right valve showing sculpture on outer surface (A1) and the hinge (A2, A3). B. NMNS PM 28117, a right valve, interior of right valve showing hinge and adductor muscle scars (B1), dorsal view showing ligament and inflation (B2), outer shell surface (B3). C. NMNS PM 28121, left valve showing shell interior (C1) and anterior adductor muscle scar (C2).