Trilobita - Ptychopariida - Phylacteridae

Full reference: A. R. Palmer. 1965. Trilobites of the Late Cambrian Pterocephaliid Biomere in the Great Basin, United States. United States Geological Survey Professional Paper 493:1-105

Parent taxon: Phylacteridae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Cliffia, Drabia, Phylacterus, Ponumia, Westonaspis

Subtaxa: Aphelotoxon acuminata, Aphelotoxon granulosus, Aphelotoxon limbata, Aphelotoxon marginata, Aphelotoxon punctata, Aphelotoxon spinosus

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Type: Bynumiella acuminata

Ecology: fast-moving low-level epifaunal carnivore