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1 October 2016 Nipponomaria, a New Pleurotomarioidean Gastropod Genus (Mollusca) from the Permian Akasaka Limestone, Central Japan
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Abstract

Pleurotomaria yokoyamai Hayasaka is a remarkably large gastropod commonly found in the middle Permian allochthonous Akasaka Limestone of central Japan. Its supraspecific systematics have however been unsettled. Examination of a museum collection and newly obtained material reveal previously unreported shell characteristics such as the presence of a long labral slit in the outer lip and a slit-like umbilicus surrounded by an accretionally growing callus pad. On the basis of these and previously known shell characters, a new genus Nipponomaria is proposed. We include Pleurotomaria? anatolica Enderle from the Permian anthracolithic limestone of northwestern Turkey as a member of this new genus.

© by the Palaeontological Society of Japan
Kaito Asato, Tomoki Kase, Teruo Ono, Katsuo Sashida, and Sachiko Agematsu "Nipponomaria, a New Pleurotomarioidean Gastropod Genus (Mollusca) from the Permian Akasaka Limestone, Central Japan," Paleontological Research 20(4), 385-393, (1 October 2016). https://doi.org/10.2517/2016PR023
Received: 27 October 2015; Accepted: 1 February 2016; Published: 1 October 2016
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