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TaxNo: 2104Girtyoceras difficile
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Girtyoceratidae
Subfamily: Girtyoceratinae
Genus: Girtyoceras
Species: difficile
Qualifier: ss
Author: Bisat 1952,p.177
Lower Boundary: Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
Upper Boundary: DER Go alpha 2--Go alpha 3 [11.60], 332.3 million years