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TaxNo: 3852Martoceras quadridentatum
Suborder: Goniatitina
Superfamily: Cycloloboidea
Family: Vidrioceratidae
Genus: Martoceras
Species: quadridentatum
Qualifier: sy
Author: Ruzhencev 1933,p.177
Valid: Martoceras subinterruptum (Krotov 1885)
Lower Boundary: Aktastinian--Baigendzhinian [AKT--BAI], 282 million years
Upper Boundary: Kungurian/Leonardian--Roadian [KUN--ROA], 270.6 million years