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TaxNo: 2521Nuculoceras nuculum+
Suborder: Goniatitina
Superfamily: Neoglyphioceratoidea
Family: Cravenoceratidae
Subfamily: Nuculoceratinae
Genus: Nuculoceras
Species: nuculum+
Qualifier: ss
Author: Bisat 1924,p.100
Lower Boundary: GBY E2c1--E2c2(Nu.stellarum--Nu.nuculum), 320.5 million years
Upper Boundary: GBY E2c4--H1a(Nu.nuculum--I.subglobosum), 319 million years