Class: Diplopoda

 Subclass: Penicillata Latrielle, 1831

Order: Polyxenida Verhoeff, 1934

 (2 superfamilies)

Superfamily: Polyxenoidea Lucas, 1940 (3 families)

Family: Hypogexenidae Schubart, 1947 (1 genus, 1 species)

Family: Lophoproctidae Silvestri, 1897 (5 genera, 30 species)

Family: Polyxenidae Lucas, 1840 (19 genera, 47 species)

Superfamily: Synxenoidea Silvestri, 1923 (1 family)

Family: Synxenidae Silvestri, 1923 (2 genera, 8 species)