TaxNo: 2500Arcanoceras praecox
| Suborder: |
Goniatitina
|
| Superfamily: |
Dimorphoceratoidea
|
| Family: |
Eogonioloboceratidae
|
| Genus: |
Arcanoceras
|
| Species: | praecox |
| Qualifier: | ss |
| Author: |
Ruzhencev 1966,p.57
|
| Lower Boundary: |
Up.Visean Goniatites BZ base [up.VIS], 333.5 million years
|
| Upper Boundary: |
DER Go beta striatus--Go beta falcatus, 329.4 million years
|