| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Ammonellipsitinae
|
| Genus: | Helicocyclus |
| Qualifier: | ge |
| Author: |
Schindewolf 1951,p.79
|
| Lower Boundary: |
GBY lower--upper Chadian [CHD], 345.3 million years
|
| Upper Boundary: |
Chadian--Arundian [V1a--V1b] [CHD--ARU], 344.5 million years
|
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