Classification
Biota [regio]Animalia [regnum]
Arthropoda [phylum]
Trilobita [classis]
Phacopida [ordo]
Ordo Phacopida contains the following taxa:
Acastidae [familia]
Cheiruridae [familia]
Dalmanitidae [familia]
Encrinuridae [familia]
Phacopidae [familia]
Pliomeridae [familia]