Trilobita - Agnostida - Ptychagnostidae

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

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

Subtaxa: Tomagnostus sibiricus

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Ecology: slow-moving nektonic suspension feeder