3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Holcodiscoides aquarius | |
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| Author | Matsumoto and Takahashi, 1991 | |
| Reference | Palaeont. Soc. Japan, Spec. Paps., No. 33, p. 66, pl. 14, fig. 1 | |
| Type specimen | Holotype: TTC. 380524, Takemi Takahashi's private collection | |
| Type locality | Suido - no - sawa Creek, Ikushumbets area, Mikasa City, Sorachi Province, central Hokkaido (ca. 142^59'50" E, 43^15'30" N) | |
| Formation name | Unit IIb, Mikasa Formation, Middle Yezo Group | |
| Age | Lower Cenomanian, Upper Cretaceous | |
| Remarks | ||