Rissoina gemma Nagao 1928 (snail)

Gastropoda - Sorbeoconcha - Rissoidae

Full reference: T. Nagao. 1928. Palaeogene fossils of the Island of Kyushu, Japan Part I. Science Reports of the Tohoku Imperial University 9(3):97-128

Belongs to Rissoina according to T. Nagao 1928

Sister taxa: Rissoina (Ailinzebina), Rissoina (Apataxia), Rissoina (Leaella), Rissoina (Mirarissoina), Rissoina (Pachyrissoina), Rissoina (Parazebinella), Rissoina (Phosinella), Rissoina (Rissoina), Rissoina (Rissolina), Rissoina (Schwartziella), Rissoina (Zebinella), Rissoina albertensis, Rissoina bruguieri, Rissoina cerithiiformis, Rissoina elegantissima, Rissoina gerasimovi, Rissoina kelseyi, Rissoina mississippiensis, Rissoina oryza, Rissoina podolica, Rissoina rakhiensis, Rissoina tennesseensis, Rissoina tenuistriata

Type specimen: Its type locality is Mirokudake, which is in an Eocene marine horizon in Japan

Ecology: epifaunal grazer

Distribution: found only at Mirokudake

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