3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Horotateceras tatsuyai | |
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| Author | Hayakawa, 1998 | |
| Reference | Bull. Mikasa City Mus., Nat. Sci., No. 2, p. 42, fig. 1A, B | |
| Type specimen | Holotype: MCM - A612 | |
| Type locality | Horotate River, a tributary of the Kotanbetsu River, Kotanbetsu area, Tomamae County, Rumoi Province, northwestern Hokkaido (ca. 141^59'E, 44^08'N) | |
| Formation name | Middle Yezo Group | |
| Age | Middle Turonian, Upper Cretaceous | |
| Remarks | ||