| 
Suborder:
 | 
Tornoceratina 
 | 
| 
Superfamily:
 | 
Prionoceratoidea 
 | 
| 
Family:
 | 
Prionoceratidae 
 | 
| 
Subfamily:
 | 
Prionoceratinae 
 | 
| 
Genus:
 | 
Imitoceras 
 | 
| 
Species:
 | 
abundans | 
| 
Qualifier:
 | 
ss | 
| 
Author:
 | 
	Miller & Collinson 1951,p.460	 
 | 
| 
Lower Boundary:
 | 
UMO Chouteau Lst. base, 354 million years
 
 | 
| 
Upper Boundary:
 | 
UMO Chouteau Lst. top, 353 million years
 
 |