| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: |
Girtyoceratidae
|
| Subfamily: |
Girtyoceratinae
|
| Genus: |
Girtyoceras
|
| Species: | discus |
| Qualifier: | sh |
| Author: |
Roemer 1852,p.95
|
| Valid: | Girtyoceras ibergense Korn 1992 |
| Lower Boundary: |
DER Go alpha 2--Go alpha 3 [11.60], 332.3 million years
|
| Upper Boundary: |
DER Go spirale--Go beta rotundum, 328.6 million years
|
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