3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Ryugasella ryugasensis | |
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| Author | Wright and Matsumoto, 1954 | |
| Reference | Mem. Fac. Sci., Kyushu Univ., Ser. D (Geol.), Vol. 4, No. 2, p. 122, pl. 7, fig. 4a - d, text - fig. 13a - e | |
| Type specimen | Holotype: UMUT MM6583 (= GT. I - 2862) | |
| Type locality | Loc. N18f, the Naibuchi Valley, Naibuchi (= Naiba) district, south Sakhalin, Russia (ca. 142^31'E, 47^20'N) | |
| Formation name | Unit Ray1, Ryugase Group | |
| Age | Campanian, Upper Cretaceous | |
| Remarks | ||