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8 April 2019 Two New Gastropods from the Late Pliocene Omma-Manganji Fauna in the Japan Sea Borderland of Honshu, Japan
Kazutaka Amano
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Abstract

A new genus and species of the gastropod family Capulidae, Vermeijia japonica, is described from the upper Pliocene Kuwae Formation in Niigata Prefecture and the lowermost part of the Sasaoka Formation in Akita Prefecture, Japan. This genus is similar to the boreal genus Ariadnaria although it was collected in association with several warm-water species. In another gastropod family, Nassariidae, Cyllene satoi is a new species from the upper Pliocene Tentokuji Formation in Akita Prefecture. Nine warm-water taxa in the Omma-Manganji fauna, including Cyllene, no longer live in the Japan Sea, except for its westernmost part. They suggest that the Tsushima Current had a higher SST during the late Pliocene than at present. Vermeijia is the fourth extinct genus of the Omma-Manganji fauna, but it disappeared in the Japan Sea by Datum A (2.75 Ma), earlier than the other three genera, which became extinct by the end of the early Pleistocene.

© by the Palaeontological Society of Japan
Kazutaka Amano "Two New Gastropods from the Late Pliocene Omma-Manganji Fauna in the Japan Sea Borderland of Honshu, Japan," Paleontological Research 23(2), 85-94, (8 April 2019). https://doi.org/10.2517/2018PR011
Received: 26 February 2018; Accepted: 2 June 2018; Published: 8 April 2019
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KEYWORDS
Gastropoda
Japan Sea
Late Pliocene
Omma-Manganji fauna
paleotemperature
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