Bathymodiolus securiformis Okutani, Fujikura, and Sasaki, 2004

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 : 591

Bathymodiolus securiformis Okutani, Fujikura, and Sasaki, 2004

Fig. 2A, B .

2004 Bathymodiolus securiformis sp. nov; Okutani et al. 2004: 105, figs. 4C, D, 7C, D, 8, 9.

2005 Bathymodiolus securiformis Okutani, Fujikura and Sasaki, 2004 ; Sasaki et al. 2005: 94, fig. 5E.

2019 Bathymodiolus securiformis Okutani, Fujikura and Sasaki, 2004 ; Kuo et al. 2019: 355, fig. 4.

Material.— Liog-Liog Point, Pliocene: five specimens, NMNS PM 28133 , 28175 , 28203–28205 (L = 118.8 mm, Fig. 2A, B ), NMNS PM 28203 , and four unnumbered specimens. Antipolo Point, Pleistocene : an isolated right valve, NMNS PM 28169 (L = 129.1 mm) .

Remarks.—The Pliocene Philippine specimens reported here differ somewhat from the extant Bathymodiolus securiformis from the Okinawa Trough by having a slightly longer anterior portion of the shell. The genetically closest species to B. securiformis , B. tangaroa Cosel and Marshall, 2003 , is less slender, and its subspecies B. tangaroa tuerkayi Cosel and Janssen, 2008 is broader on the posterior side ( Cosel and Marshall 2003; Okutani et al. 2004; Cosel and Janssen 2008).

Stratigraphic and geographic range.—Pliocene: Leyte, Philippines. Recent: Okinawa Trough.

Figures

Fig. 2. Bathymodiolin bivalves from Pliocene (B, C, Liog-Liog Point) and Pleistocene (A, Antipolo Point) seep deposits in Leyte, Philippines. A, B. Bathymodiolus securiformis Okutani, Fujikura, and Sasaki, 2004. A. NMNS PM 28169, a right valve. B. NMNS PM 28202, an articulated specimen in dorsal view (B1), exterior of left valve (B2). C. The unidentified bathymodiolin, NMNS PM 28170, outside of right valve (C1), specimen in dorsal (C2), ventral (C3), and anterior (C4) views.