| Suborder: |
Tornoceratina
|
| Superfamily: |
Prionoceratoidea
|
| Family: |
Prionoceratidae
|
| Subfamily: |
Prionoceratinae
|
| Genus: |
Balvia
|
| Species: | obesa |
| Qualifier: | ss |
| Author: |
Ruan 1981,p.57
|
| Lower Boundary: |
UD5C--UD6A1: Sphenoclym.brevispina base, 364 million years
|
| Upper Boundary: |
UD6E--UD6F:Cym.nigra--A.prorsum [19,40], 360 million years
|
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