| Suborder: |
Goniatitina
|
| Superfamily: |
Thalassoceratoidea
|
| Family: |
Thalassoceratidae
|
| Subfamily: |
Thalassoceratinae
|
| Genus: |
Prothalassoceras
|
| Species: | biforme |
| Qualifier: | ss |
| Author: |
Gerasimov 1937,p.17
|
| Lower Boundary: |
Gzhelian--Asselian [C--P], 299 million years
|
| Upper Boundary: |
Asselian--Sakmarian [ASS--SAK], 294.6 million years
|
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