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TaxNo: 5644Genus Adelphoceras
Suborder: Goniatitina
Superfamily: Dimorphoceratoidea
Family: Girtyoceratidae
Subfamily: Girtyoceratinae
Genus: Adelphoceras
Qualifier: gy
Author: Girty 1909,p.64
Valid: Girtyoceras Wedekind, 1918, p.140
Lower Boundary: Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
Upper Boundary: Pendleian--Arnsbergian [PND--ARN], 324 million years