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TaxNo: 5787Genus Polonoceras
Suborder: Tornoceratina
Superfamily: Tornoceratoidea
Family: Tornoceratidae
Subfamily: Aulatornoceratinae
Genus: Polonoceras
Qualifier: ge
Author: Dybczynski 1913,p.519
Lower Boundary: UD2A--UD2B:(verneuili Zone base) [07,75], 374 million years
Upper Boundary: UD2H--UD2I:(mamilliferum base) [12,90], 370 million years