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
|