| Polyzoniida Cook, 1895 (Order) |
| | | | | | | | | | details |
| Hirudisomatidae Silvestri, 1896 (Family) |
| | | | | | | | | | details |
| Euzonium Chamberlin, 1959 (Genus) |
| | | | | | | | | | details |
| Heterozonium Verhoeff, 1899 (Genus) |
| | | | | | | | | | details |
| Hirudisoma Fanzago, 1881 (Genus) |
| | | | | | | | | | details |
| Hypozonium Cook, 1904 (Genus) |
| | | | | | | | | | details |
| Kiusiozonium Verhoeff, 1941 (Genus) |
| | | | | | | | | | details |
| Leiosoma Victor, 1939 (Genus) |
| | | | | | | | | | details |
| Mexiconium Shelley, 1996 (Genus) |
| | | | | | | | | | details |
| Nepalozonium Shelley, 1996 (Genus) |
| | | | | | | | | | details |
| Octoglena Wood, 1864 (Genus) |
| | | | | | | | | | details |
| Orsiboe Attems, 1909 (Genus) |
| | | | | | | | | | details |
| Platyzonium Cook, 1895 (Genus) |
| | | | | | | | | | details |