Trilobita - Agnostida - Agnostidae
Full reference: C. L. Chu. 1959. Trilobites from the Kushan Formation of north and northeastern China. Memoirs of the Institute of Palaeontology Academia Sinica 2:44-128
Parent taxon: Agnostidae according to H. B. Whittington et al. 1997
Sister taxa: Acmarhachis, Acutatagnostus, Agnostardis, Agnostus, Ammagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Glyptagnostus, Gymnagnostus, Hadragnostus, Homagnostus, Idolagnostus, Innitagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Leiagnostus, Lotagnostus, Micragnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Phalagnostus, Proagnostus, Strictagnostus, Trilobagnostus
Subtaxa: Quadrahomagnostus subquadratus, Quadrahomagnostus tienshihfuensis
Type: Quadrahomagnostus subquadratus
Ecology: slow-moving nektonic suspension feeder