| Specimen state | |
|---|---|
| Common name | Bivalue,Glycymeris |
| Scientific name | Glycymeris(Glycymeris)amakusensis Nagao |
| Order | |
| Family | |
| Country | Japan |
| Prefecture, State | Kumamoto |
| City | Amakusa,Ryugadake |
| Group | Himenoura Group |
| Formation | |
| Era | Mesozoic |
| Period | Cretaceous |
| Epoch | Late |