3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Tetragonites minimus | |
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| Author | Shigeta, 1989 | |
| Reference | Trans. Proc. Palaeont. Soc. Japan, N. S., No. 156, p. 336, fig. 13 - 4a, b | |
| Type specimen | Holotype: UMUT MM18667 - 1 | |
| Type locality | Loc. T1220, an outcrop in the Obirashibe River, at 100 m lower stream from the confluence with the Akanosawa Creek, Tappu area, Obira Town, Rumoi Province, northwestern Hokkaido (141^59'16" E, 44^06'36" N) | |
| Formation name | Upper Yezo Group | |
| Age | Coniacian, Upper Cretaceous | |
| Remarks | ||