Trilobita - Ptychopariida - Olenidae

Full reference: B. N. Cooper. 1953. Trilobites from the Lower Champlainian formations of the Appalachian Valley. Geological Society of America Memoir 55:1-69

Parent taxon: Oleninae according to R. Ludvigsen and P. A. Tuffnell 1983

Sister taxa: Plesioparabolina, Triarthrus, Bienvillia

Subtaxa: Porterfieldia caecigenus, Porterfieldia convergens, Porterfieldia fisheri, Porterfieldia jachalensis, Porterfieldia parapunctata, Porterfieldia sinensis, Porterfieldia thor

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Ecology: fast-moving low-level epifaunal carnivore