A New Fossil Species of the Genus Cyclophorus (Gastropoda: Caenogastropoda: Cyclophoridae) from the Miocene Bihoku Group, Okayama Prefecture, Southwestern Japan

Takahiro Hirano; Keiji Matsuoka

doi:10.18941/venus.82.1-4_101

Venus (Journal of the Malacological Society of Japan)

Online ISSN : 2189-7697
Print ISSN : 1348-2955
ISSN-L : 1348-2955

Original Articles

A New Fossil Species of the Genus Cyclophorus (Gastropoda: Caenogastropoda: Cyclophoridae) from the Miocene Bihoku Group, Okayama Prefecture, Southwestern Japan

Takahiro Hirano, Keiji Matsuoka

Author information

Keywords: land snails, Asia, extinct species, taxonomy

JOURNAL OPEN ACCESS

2024 Volume 82 Issue 1-4 Pages 101-108

DOI https://doi.org/10.18941/venus.82.1-4_101

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Abstract

A new species of cyclophorid gastropod belonging to the genus Cyclophorus Montfort, 1810, is described from the upper Lower Miocene Korematsu Formation (17.0–16.5 Ma) of the Bihoku Group in Kubara, Nishigata, Niimi City, Okayama Prefecture, southwest Japan. Cyclophorus kubarensis n. sp. is morphologically distinct from all other extant Japanese and Vietnamese Miocene fossil species in its weak suture and weakly angulate periphery of the body whorl.

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