Genus
Pakrioceras Stumbur et Mutvei, 1983
Selection of related publications
Stumbur, H., Mutvei,  H. 1983. A new Middle Ordovician torticonic nautiloid.  GFF   105,   1,   43-47. DOI:DOI: 10.1080/11035898309455293
List of species
1. Pakrioceras holmi Stumbur et Mutvei, 1983 | Aseri Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Cephalopoda | 
| Subclass | Tarphyceratia | 
| Order | Tarphyceratida | 
| Family | Estonioceratidae | 
| Genus | Aethoceras | 
| Aphetoceras | |
| Aserioceras | |
| Bentoceras | |
| Clytoceras | |
| Eichwaldoceras | |
| Estonioceras | |
| Falcilituites | |
| Pakrioceras | |
| Species | holmi | 
| Genus | Planctoceras | 
| Pycnoceras | |
| Shumardoceras | |
| Tragoceras |