Oligocene pteropods (Gastropoda: Thecosomata) from the Kishima Formation, Saga Prefecture, southwest Japan
Keywords: Pteropoda, new species, biostratigraphy, Oligocene, Japan
AbstractFive species in two genera of pteropods, Limacina conica (Koenen, 1892), L. hospes Rolle, 1861, L. karasawai new species, Limacina sp. and Creseis kishimaensis new species, are described from the Oligocene Kishima Formation of Saga Prefecture, northwestern Kyushu, southwest Japan. These species constitute the ﬁ rst Oligocene pteropod record from Japan. The pteropod fauna of the Kishima Formation is characterized by the predominate occurrence of the genus Limacina. The Oligocene pteropod fauna from Japan is brieﬂ y discussed.