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TaxNo: 2024Girtyoceras araneum
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Girtyoceratidae
Subfamily: Girtyoceratinae
Genus: Girtyoceras
Species: araneum
Qualifier: ss
Author: Nicolaus 1963,p.118
Lower Boundary: DER Go alpha 1--Go alpha 2 [11.00], 333 million years
Upper Boundary: DER Go alpha 2--Go alpha 3 [11.60], 332.3 million years