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TaxNo: 1795Maeneceras biferum nuntio
Suborder: Tornoceratina
Superfamily: Praeglyphioceratoidea
Family: Sporadoceratidae
Genus: Maeneceras
NomSpecies: biferum
Species: nuntio
Qualifier: ss
Author: Becker 1993,p.307
Lower Boundary: UD2F--UD2G:(subvaricatum Zone base), 370.8 million years
Upper Boundary: UD2H--UD2I:(mamilliferum base) [12,90], 370 million years