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TaxNo: 4209Gastrioceras glenisteri
Suborder: Goniatitina
Superfamily: Gastrioceratoidea
Family: Gastrioceratidae
Genus: Gastrioceras
Species: glenisteri
Qualifier: ss
Author: Nassichuk 1975,p.132
Lower Boundary: Langsettian--Duckmantian, Westphal.A--B, 311.3 million years
Upper Boundary: Moscovian--Kasimovian [MOS--KAS], 306.5 million years