†family Orthonematidae Nützel and Bandel 2000
Alternative spelling: Orthonematinae
Parent taxon: Palaeostyloidea according to A. Kaim et al. 2006
Sister taxon: Palaeostylidae
Subtaxa: Neorthonema, Orthonema, Spirocyclus, Yochelsonistylus
Type: Orthonema