TaxNo: 142Genus Nigrocyclus
| Suborder: |
Goniatitina
|
| Superfamily: |
Pericycloidea
|
| Family: |
Pericyclidae
|
| Subfamily: |
Pericyclinae
|
| Genus: | Nigrocyclus |
| Qualifier: | gn |
| Author: |
Korn & Feist 2007,p.112
|
| Lower Boundary: |
low.Tournais.--mid.Tournais. [Tn1--Tn2], 357.5 million years
|
| Upper Boundary: |
mid.Tournais.--up.Tournaisian [Tn2--Tn3], 353 million years
|