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TaxNo: 922Maeneceras biferum sulciferum
Suborder: Tornoceratina
Superfamily: Praeglyphioceratoidea
Family: Sporadoceratidae
Genus: Maeneceras
NomSpecies: biferum
Species: sulciferum
Qualifier: ss
Author: Lange 1929,p.43
Lower Boundary: UD2F--UD2G:(subvaricatum Zone base), 370.8 million years
Upper Boundary: UD4B--UD4C: serpentina Zone base [16,45], 366.4 million years