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TaxNo: 2675Calygirtyoceras arcticum
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Girtyoceratidae
Subfamily: Girtyoceratinae
Genus: Calygirtyoceras
Species: arcticum
Qualifier: ss
Author: Gordon 1957,p.50
Lower Boundary: UAK Alapah Lst. base, 333.5 million years
Upper Boundary: UAK Alapah Lst. top, 326.4 million years