TaxNo: 5018Rotodiscoceras margarium
| Suborder: |
Paraceltitina
|
| Superfamily: |
Xenodiscoidea
|
| Family: |
Pleuronodoceratidae
|
| Genus: |
Rotodiscoceras
|
| Species: | margarium |
| Qualifier: | ss |
| Author: |
Zhao & Liang 1978,p.423
|
| Lower Boundary: |
Pseudotir./Pleuron.--Rotodiscoceras beds, 252 million years
|
| Upper Boundary: |
Rotodiscoceras top, 251.5 million years
|