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TaxNo: 4004Subfamily Girtyoceratinae
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Girtyoceratidae
Subfamily: Girtyoceratinae
Qualifier: fy
Author: Wedekind 1918,p.139
Valid: Girtyoceratidae Wedekind,1918
Lower Boundary: Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
Upper Boundary: Pendleian--Arnsbergian [PND--ARN], 324 million years