| Suborder: |
Goniatitina
|
| Superfamily: |
Gastrioceratoidea
|
| Family: |
Homoceratidae
|
| Subfamily: |
Homoceratinae
|
| Genus: |
Isohomoceras
|
| Species: | praematurum |
| Qualifier: | ss |
| Author: |
Haug 1898,p.98
|
| Lower Boundary: |
RUS Nm1c2--Nm2a1, Homoc.-Hudsonoc.GZ, 318.1 million years
|
| Upper Boundary: |
RUS Nm2a1--Nm2a2 (H.coronat.--Hu.proteus, 317.7 million years
|
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