TaxNo: 2827Aristoceras appressum
| Suborder: |
Goniatitina
|
| Superfamily: |
Thalassoceratoidea
|
| Family: |
Thalassoceratidae
|
| Subfamily: |
Thalassoceratinae
|
| Genus: |
Aristoceras
|
| Species: | appressum |
| Qualifier: | ss |
| Author: |
Ruzhencev 1950,p.102
|
| Lower Boundary: |
RUS Zhigulian--Orenburgian [Ruzhentsev], 305 million years
|
| Upper Boundary: |
Asselian--Sakmarian [ASS--SAK], 294.6 million years
|