Parent taxon: Crustacea according to J. W. Martin and G. E. Davis 2001

Sister taxa: Apudites, Bradoriamorphes, Branchiopoda, Canadaspidida, Cephalocarida, Cirripedia, Copepoda, Malacostraca, Nuculina, Oelandocaris, Ostracoda, Protocaridida, Remipedia, Waptiida

Subtaxa: Branchiura, Mystacocaridida, Pentastomida, Tantulocarida, Thecostraca

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Ecology: