TaxNo: 5138Genus Prototoceras
| Suborder: |
Otoceratina
|
| Family: |
Araxoceratidae
|
| Subfamily: |
Araxoceratinae
|
| Genus: | Prototoceras |
| Qualifier: | ge |
| Author: |
Spath 1930,p.8
|
| Lower Boundary: |
AZB base Araxoceras beds, 260.4 million years
|
| Upper Boundary: |
AZB Araxoceras--Vedioceras beds, 256 million years
|