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TaxNo: 2205Irinoceras arcuatum+
Suborder: Tornoceratina
Superfamily: Prionoceratoidea
Family: Prionoceratidae
Subfamily: Prionoceratinae
Genus: Irinoceras
Species: arcuatum+
Qualifier: ss
Author: Ruzhencev 1947,p.283
Lower Boundary: RUS Nm1a1 base, Hypergon.-Ferganoc. GZ, 327.8 million years
Upper Boundary: RUS Nm1c1--Nm1c2(uralicus--Del.bressoni), 322 million years