TaxNo: 4033Prototoceras ventroplanum
| Suborder: |
Otoceratina
|
| Family: |
Araxoceratidae
|
| Subfamily: |
Araxoceratinae
|
| Genus: |
Prototoceras
|
| Species: | ventroplanum |
| Qualifier: | ss |
| Author: |
Zheng & Ma 1982,p.283
|
| Lower Boundary: |
Araxoc./Konglingites--Sanyangites, 256 million years
|
| Upper Boundary: |
Sanyangites--Iranites/Phisonites, 253.8 million years
|