†order Hoplostraca Schram 1973 (crustacean)
Parent taxon: Malacostraca according to J. J. Sepkoski 2002
Sister taxa: Aeschronectida, Belotelsonidea, Cumacea, Eocaridacea, Eucarida, Eumalacostraca, Hoplocarida, Hymenostraca, Isopoda, Lophogastrida, Palaeocaridacea, Palaeostomatopoda, Phyllocarida, Silesicaris, Tanaidacea, Waterstonellidea
Subtaxa: Kellibrookia, Sairocaris
Ecology: epifaunal omnivore