TaxNo: 2104Girtyoceras difficile
| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: |
Girtyoceratidae
|
| Subfamily: |
Girtyoceratinae
|
| Genus: |
Girtyoceras
|
| Species: | difficile |
| Qualifier: | ss |
| Author: |
Bisat 1952,p.177
|
| Lower Boundary: |
Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
|
| Upper Boundary: |
DER Go alpha 2--Go alpha 3 [11.60], 332.3 million years
|