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TaxNo: 5218Genus Thalassoceras
Suborder: Goniatitina
Superfamily: Thalassoceratoidea
Family: Thalassoceratidae
Subfamily: Thalassoceratinae
Genus: Thalassoceras
Qualifier: ge
Author: Gemmellaro 1887,p.69
Lower Boundary: Asselian--Sakmarian [ASS--SAK], 294.6 million years
Upper Boundary: Wordian--Capitanian (Midian) [WOR--CAP], 265.8 million years