Planorbidella, Waren and Bouchet, 1993

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 : 616

Planorbidella ? sp.

Fig. 29D .

Material.— Three specimens from the Pliocene of Liog-Liog Point ( NMNS PM 28438–28440 ) and one specimen ( NMNS PM 28117 ) from the Pleistocene of Cambantug Point .

Dimensions (in mm).—NMNS PM 28438, W = 2.9, H = 1.3.

Remarks.—Shells of the heterobranch genera Hyalogyra and Hyalogyrina are quite similar, but the “archaegastropod”- type protoconch ( Fig. 29D 3 ) makes affinities with the neomphaline Planorbidella more likely. However, the protoconch lacks the irregular net sculpture typical for Planorbidella , but this might be an artefact of preservation.

Figures

Fig. 29. Neomphaline and Vetigastopoda from late Pliocene (A–F, Liog-Liog Point) and Pleistocene (G, Antipolo Point) seep deposit in Leyte, Philippines. A–C. The neomphalid Retiskenea sp. A. NMNS PM 28435, in apical (A1) and apertural (A2) views. B. NMNS PM 28436, apertural view. C. NMNS PM 28437, apertural view. D. The neomphalid Planorbidella sp., NMNS PM 28438, in apical (D1) and apertural (D2) views, and close-up on protoconch (D3). E. Lopheliella? sp., NMNS PM 28442, apertural view, note umbilical slit bordered by distinct ridge. F. The skeneid vetigastropod Dillwynella sp., NMNS PM 28441, apical view. G. The trochoid vetigastropod Solariella sp., NMNS PM 28443, apical view.

Fig. 3. The thyasirid bivalve Conchocele majimai sp. nov. from the Pliocene Liog-Liog Point seep deposit in Leyte, Philippines. A. Paratype NMNS PM 28171, an isolated right valve; outer shell surface (A1), anterior side (A2), posterodorsal margin (A3). B. Holotype NMP-2159, an isolated left valve; posterodorsal margin (B1), anterior side (B2), outer shell surface (B3).