3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Pachydiscus subcompressus | |
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| Author | Matsumoto, 1954 | |
| Reference | In T. Matsumoto (editor): The Cretaceous System in the Japanese Islands, Jap. Soc. Prom. Sci., Tokyo, p. 287, pl. 10, fig. 4a, b | |
| Type specimen | Holotype: UMUT MM6821 (= GT. I - 2815) | |
| Type locality | Loc. N105, the Naibuchi Valley, Naibuchi (=Naiba) district, south Sakhalin, Russia (ca. 142^30'E, 47^19'N) | |
| Formation name | Ryugase Group ? | |
| Age | Senonian, Upper Cretaceous | |
| Remarks | ||