A new species of the genus heterogen (Mollusca: Caenogastropoda: Viviparidae) from the pleistocene katata formation of the kobiwako group, shiga prefecture, central Japan

Keiji Matsuoka, Takahiro Hirano

Research output: Contribution to journalArticlepeer-review

Abstract

A new species of viviparid gastropod belonging to the genus Heterogen Annandale, 1921, is described from the Pleistocene Katata Formation of the Kobiwako Group in the southern part of Lake Biwa, central Japan. This new species is continuously recorded from the Nijigaoka Clays (1.2 Ma) to the Hiraen Clays (0.8 Ma) of the Katata Forma-tion. This new species, Heterogen praelongispira sp. nov. is similar to the extant H. longispira in Lake Biwa, but the details of shell morphology are different from those of H. longispira, including fine-to-deep suture, flattened whorl side, and oval shape of embryonic shell.

Original languageEnglish
Pages (from-to)232-237
Number of pages6
JournalPlankton and Benthos Research
Volume15
Issue number3
DOIs
Publication statusPublished - 2020

Keywords

  • Ancient lake
  • Benthos
  • Fossil
  • Gastropoda

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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