| Suborder: |
Tornoceratina
|
| Superfamily: |
Prionoceratoidea
|
| Family: |
Prionoceratidae
|
| Subfamily: |
Prionoceratinae
|
| Genus: |
Balvia
|
| Species: | tetragona aff. |
| Qualifier: | af |
| Author: |
Ruan 1988,p.254
|
| Lower Boundary: |
Devonian--Carboniferous Boundary [DCB], 359.2 million years
|
| Upper Boundary: |
DER Acutimit.acutum--Paproth.dorsoplanus, 358.8 million years
|
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