†order Agnostida Salter 1864 (artiopod)
Parent taxon: Artiopoda according to J. Moysiuk and J.-B. Caron 2019
See also Bengtson 1992, Harrington and Leanza 1957, Landing et al. 2008, Palmer and Gatehouse 1972, Robison and Pantoja-Alor 1968, Sepkoski 2002 and Whittington et al. 1997
Sister taxa: Conciliterga, Falcatamacaris, Kwanyinaspis, Molaria, Phytophilaspis, Retifacies, Squamacula, Trilobita, Trilobitomorpha, Vicissicaudata, Zonoscutum, Zonozoe
Subtaxa: Agnostina Ceragnostus Eodiscina Formagnostus Lavsanodiscus Pleurinodus Quadrahomagnostinae Sphaeragnostidae
Ecology: slow-moving epifaunal detritivore