| Suborder: |
Tornoceratina
|
| Superfamily: |
Tornoceratoidea
|
| Family: |
Tornoceratidae
|
| Subfamily: |
Aulatornoceratinae
|
| Genus: |
Protornoceras
|
| Species: | siemiradzkii |
| Qualifier: | ss |
| Author: |
Dybczynski 1913,p.516
|
| Lower Boundary: |
UD2H--UD2I:(mamilliferum base) [12,90], 370 million years
|
| Upper Boundary: |
P.delph.--low.Platyclym.annulata IIIb/IV, 367.6 million years
|
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