Trilobita - Agnostida - Ptychagnostidae

Parent taxon: Ptychagnostidae according to H. B. Whittington et al. 1997

Sister taxa: Goniagnostus, Lejopyge, Myrmecomimus, Onymagnostus, Pentagnostus, Pseudophalacroma, Tomagnostus, Triplagnostus, Zeteagnostus

Subtaxa: Ptychagnostus (Ptychagnostus), Ptychagnostus acidusus, Ptychagnostus aculeatus, Ptychagnostus aksayensis, Ptychagnostus atavus, Ptychagnostus convexus, Ptychagnostus cuyanus, Ptychagnostus intermedius, Ptychagnostus karatauensis, Ptychagnostus leptus, Ptychagnostus punctuosus, Ptychagnostus seminula, Ptychagnostus sinicus, Ptychagnostus spinosus

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Ecology: nektonic suspension feeder