†order Archaeostraca Claus 1888 (arthropod)
Parent taxon: Phyllocarida according to F. R. Schram 1979
See also Bengtson 1992, Briggs et al. 2004, Collette and Hagadorn 2010, Hegna et al. 2020 and Sepkoski 2002
Sister taxa: Aristocaris, Coreocaris, Dioxycaris, Discinocarina, Galenocaris, Hoplostraca, Leptostraca, Nebaliella, Nothozoe, Phasganocaris, Protocimex, Saccocaris, Shafferia
Subtaxa: Arenosicaris Baituganocaris Caryocaridina Ceratiocaridina Dictyocaris Dilophaspis Echinocaridina Emmelezoe Guerichicaris Kerfornecaris Lebesconteia Palaeopemphida Pephricaridina Rhinocaridina Rhinocarina Schugurocaris Trigonocarys
Ecology: nektobenthic carnivore