Family URONEMATIDAE Thompson, 1964

Body small, elongate-ovoid, sparsely ciliated, with anterior pole conspicuously naked and caudal cilium or cilia at posterior pole; buccal ciliature relatively inconspicuous in long and shallow depression, and "membranelle" number 1 entirely nonciliferous; scutico-vestige bears cilia; in marine or fresh-water habitats, occasionally edaphic.

Homalogastra Kahl, 1926. Few species.
Pseuduronema Hoare, 1927. Single species.
Urocyclon Small [unpublished] . Single species.
Uronema Dujardin, 1841. Many to very many species.
Uronemopsis Kahl, 1931. Single species.
Uropedalium Kahl, 1928. Few species.