Trilobita - Agnostida - Agnostidae

Parent taxon: Agnostidae according to P. A. Jell and J. M. Adrain 2003

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, Quadrahomagnostus, Trilobagnostus

Subtaxa: Strictagnostus latisulcus

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Ecology: slow-moving nektonic suspension feeder