| 
Suborder:
 | 
Anarcestina 
 | 
| 
Superfamily:
 | 
Anarcestoidea 
 | 
| 
Family:
 | 
Holzapfeloceratidae 
 | 
| 
Genus:
 | 
Holzapfeloceras 
 | 
| 
Species:
 | 
micromphalum | 
| 
Qualifier:
 | 
ss | 
| 
Author:
 | 
	Roemer 1850,p.19	 
 | 
| 
Lower Boundary:
 | 
DER Wissenbach Shale base, 402 million years
 
 | 
| 
Upper Boundary:
 | 
DER Wissenbach Shale top, 394.5 million years
 
 |