Gastropoda Cuvier, 1795

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 : 614

Class Gastropoda Cuvier, 1795

Limpets of uncertain affinities

Remarks.—In the absence of data on shell microstructure and protoconch, the four species reported below are difficult to place. Serradonta Okutani, Tsuchida, and Fujikura, 1992 and Bathyacmaea Okutani, Tsuchida, and Fujikura, 1992 ( Pectinodontidae ) have been shown to vary greatly in outline (from oval to pointed egg-shaped), in the position of the apex (subcentrally to displaced anteriorly) and surface sculpture (from nearly smooth to having strong beaded radial ribs), both within genera as well as within species ( Chen et al. 2019). Very similar external morphologies are for example also found among member of the paralepetopsids and neolepetopsids ( McLean 1990, 2008, Warén and Bouchet 2009).