3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Microdesmoceras tetragonum | |
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| Author | Matsumoto and Muramoto, 1972 | |
| Reference | Trans. Proc. Palaeont. Soc. Japan, N. S., No. 87, p. 378, pl. 47, fig. 1 | |
| Type specimen | Holotype: GK. H5653 | |
| Type locality | Loc. Ik 1101 on the northern wall of the V - shaped valley of the Ikushumbets, Mikasa City, Sorachi Province, central Hokkaido (141^59'30" E, 43^15'00" N) | |
| Formation name | Lower part of unit IIb, Mikasa Formation, Middle Yezo Group | |
| Age | Lower Cenomanian, Upper Cretaceous | |
| Remarks | ||