Urastomidae

Protostomia Grobben, 1908

Platyhelminthes Minot, 1876

Rhabditophora Ehlers, 1985

Trepaxonemata Ehlers, 1984

Euneoophora Laumer & Giribet, 2014

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

Adiaphanida Noren & Jondelius, 2002

Fecampiida Rohde, Luton & Johnson, 1994

Urastomidae Westblad, 1955