TaxNo: 5131Genus Rotodiscoceras
| Suborder: |
Paraceltitina
|
| Superfamily: |
Xenodiscoidea
|
| Family: |
Pleuronodoceratidae
|
| Genus: | Rotodiscoceras |
| Qualifier: | ge |
| Author: |
Chao & Liang 1966,p.
|
| Lower Boundary: |
Pseudotir./Pleuron.--Rotodiscoceras beds, 252 million years
|
| Upper Boundary: |
Rotodiscoceras top, 251.5 million years
|