Palaeogene decapod Crustacea from the Kishima and Okinoshima Groups, Kyushu, Japan

Twelve species in 11 genera of decapod crustaceans are recorded from Palaeogene rocks of Nagasaki and Saga Prefectures, Kyushu, Japan. Carinocarcinoides gen. nov. (Goneplacidae) is proposed to accommodate Carinocarcinoides carinatus sp. nov. and Varuna angustifrons Karasawa from the lower Oligocene Kishima Group. A new monotypic genus, Cicarnus (Portunidae), is erected with Cicarnus fumiae sp. nov. from the middle Eocene Okinoshima Group. Neocallichirus sakiae sp. nov. (Callianassidae) is described from the lower Oligocene Kishima Group. Axius (s. I.) sp. and Euphylax ? sp. from the Kishima Group represent the first records for both genera from the Oligocene of Japan. The occurrence of Minotielienus macroctieilus Kato and Karasawa extends the known geologic range of this species back to the lower Oligocene. A new description is given for Collinsius simplex Karasawa.