Trilobita - Agnostida - Agnostidae

Full reference: R. A. Robison and J. Pantoja-Alor. 1968. Tremadocian trilobites from the Nochixtlan Region, Oaxaca, Mexico. Journal of Paleontology 42(3):767-800

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

Sister taxa: Acmarhachis, Acutatagnostus, Agnostardis, Agnostus, Ammagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Glyptagnostus, Hadragnostus, Homagnostus, Idolagnostus, Innitagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Leiagnostus, Lotagnostus, Micragnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Phalagnostus, Proagnostus, Quadrahomagnostus, Strictagnostus, Trilobagnostus

Subtaxa: Gymnagnostus congros, Gymnagnostus mexicanus

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Type: Gymnagnostus congros

Ecology: slow-moving nektonic suspension feeder