| Suborder: |
Tornoceratina
|
| Superfamily: |
Prionoceratoidea
|
| Family: |
Prionoceratidae
|
| Subfamily: |
Acutimitoceratinae
|
| Genus: | Acutimitoceras |
| Qualifier: | ge |
| Author: |
Librovitch 1957,p.263
|
| Lower Boundary: |
UD6E--UD6F:Cym.nigra--A.prorsum [19,40], 360 million years
|
| Upper Boundary: |
low.Tournais.--mid.Tournais. [Tn1--Tn2], 357.5 million years
|
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