TaxNo: 2833Paraschistoceras optatum
| Suborder: |
Goniatitina
|
| Superfamily: |
Schistoceratoidea
|
| Family: |
Schistoceratidae
|
| Genus: |
Paraschistoceras
|
| Species: | optatum |
| Qualifier: | ss |
| Author: |
Ruzhencev 1950,p.122
|
| Lower Boundary: |
RUS lower--upper Zhigulian, 305.9 million years
|
| Upper Boundary: |
Gzhelian--Asselian [C--P], 299 million years
|