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TaxNo: 1903Protornoceras subacutum
Suborder: Tornoceratina
Superfamily: Tornoceratoidea
Family: Tornoceratidae
Subfamily: Aulatornoceratinae
Genus: Protornoceras
Species: subacutum
Qualifier: sy
Author: Sobolev 1914,p.360
Valid: Protornoceras simplificatum (Sobol.1914)
Lower Boundary: UD2H--UD2I:(mamilliferum base) [12,90], 370 million years
Upper Boundary: P.delph.--low.Platyclym.annulata IIIb/IV, 367.6 million years