TaxNo: 265Helicocyclus involutus
| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Ammonellipsitinae
|
| Genus: |
Helicocyclus
|
| Species: | involutus |
| Qualifier: | ss |
| Author: |
Kuzina 1977,p.66
|
| Lower Boundary: |
RUN Kos'vinskii gorizont base, 349 million years
|
| Upper Boundary: |
RUN Kos'vinskii--Nortnichskii, 340 million years
|