3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Heteroptychoceras obatai | |
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| Author | Matsumoto, 1977 | |
| Reference | Mem. Fac. Sci., Kyushu Univ., Ser. D (Geol.), Vol. 23, No. 3, p. 357, pl. 58, fig. 4 | |
| Type specimen | Holotype: NSM. PM7243 | |
| Type locality | Loc. Y103p, Isojiro - no - sawa Creek, Oyubari area, Sorachi Province, central Hokkaido (142^07'47" E, 43^05'48" N) | |
| Formation name | Upper Yezo Group | |
| Age | Santonian, Upper Cretaceous | |
| Remarks | ||