Trilobita - Agnostida - Peronopsidae

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

Sister taxa: Archaeagnostus, Axagnostus, Diplorrhina, Peronopseinae, Peronopsella, Phalacrominae, Svenax

Subtaxa: Peronopsis (Armagnostus), Peronopsis acadica, Peronopsis amplaxis, Peronopsis angustilimbatus, Peronopsis bilobus, Peronopsis bulkurensis, Peronopsis curtus, Peronopsis cylindrica, Peronopsis elongatus, Peronopsis gaspensis, Peronopsis guoleensis, Peronopsis inarmata, Peronopsis integer, Peronopsis intermedius, Peronopsis laiwuensis, Peronopsis ozakii, Peronopsis prodigialis, Peronopsis pseudointerstrictus, Peronopsis shandongensis, Peronopsis taitzuhoensis, Peronopsis ultimus, Peronopsis xichuanensis

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Type: Acadagnostus acadicus

Ecology: slow-moving nektonic suspension feeder