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TaxNo: 1561Gyroceratites circularis
Suborder: Agoniatitina
Superfamily: Mimoceratoidea
Family: Mimoceratidae
Genus: Gyroceratites
Species: circularis
Qualifier: ss
Author: Barrande 1865,pl.10
Lower Boundary: CZB praecursor Zone base [12,10], 406.4 million years
Upper Boundary: CZB barrandei--elegans Zone [13,25], 404.4 million years