TaxNo: 6747Helicocyclus fuscus
| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Ammonellipsitinae
|
| Genus: |
Helicocyclus
|
| Species: | fuscus |
| Qualifier: | ss |
| Author: |
Korn et al. 2003,p.84
|
| Lower Boundary: |
mid.Tournais.--up.Tournaisian [Tn2--Tn3], 353 million years
|
| Upper Boundary: |
DET Zadelsdorf top, 349 million years
|