| Suborder: |
Otoceratina
|
| Family: |
Araxoceratidae
|
| Subfamily: |
Araxoceratinae
|
| Genus: |
Prototoceras
|
| Species: | abichianum |
| Qualifier: | ss |
| Author: |
Ruzhencev 1959,p.65
|
| Lower Boundary: |
AZB Araxoceras--Vedioceras beds, 256 million years
|
| Upper Boundary: |
AZB Vedioceras--Phisonites beds, 253.8 million years
|
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