Opisthogeniidae

Protostomia Grobben, 1908

Platyhelminthes Minot, 1876

Rhabditophora Ehlers, 1985

Trepaxonemata Ehlers, 1984

Amplimatricata Egger, Lapraz, Tomiczek, et al., 2015

Polycladida Lang, 1884 [sensu Faubel 1983/1984]

Cotylea Lang, 1884

Opisthogenioidea Faubel, 1984

Opisthogeniidae Palombi, 1928