TaxNo: 3752Pentagonoceras spinosum
| Suborder: |
Paraceltitina
|
| Superfamily: |
Xenodiscoidea
|
| Family: |
Pleuronodoceratidae
|
| Genus: |
Pentagonoceras
|
| Species: | spinosum |
| Qualifier: | ss |
| Author: |
Zhao et al. 1978,p.158
|
| Lower Boundary: |
Pseudotir./Pleuron.--Rotodiscoceras beds, 252 million years
|
| Upper Boundary: |
Rotodiscoceras top, 251.5 million years
|