Alleculidae Laporte de Castelnau, 1840 accepted as Tenebrionidae Latreille, 1802 (extant flag source)
Ascaphidae Fejérváry, 1923 (extant flag source)
Astrophyton Schultze, 1760 (extant flag source)
Bombinatoridae Gray, 1825 (extant flag source)
Calpensiidae Canu & Bassler, 1923 accepted as Microporidae Gray, 1848 (extant flag source)
Chicomurex Arakawa, 1964 (extant flag source)
Cornirostridae Ponder, 1990 (extant flag source)
Daldorfiidae Ng & Rodriguez, 1986 accepted as Parthenopidae MacLeay, 1838 (extant flag source)
Diastomidae Cossmann, 1893 accepted as Diastomatidae Cossmann, 1893 (extant flag source)
Dicamptodontidae Tihen, 1958 (extant flag source)
Dryopteridaceae Herter, 1949 (extant flag source)
Galeopsis Jullien, 1903 (extant flag source)
Kogiidae Gill, 1871 (extant flag source)
Laonastidae Jenkins et al., 2005 accepted as Diatomyidae Mein & Ginsburg, 1997 (extant flag source)
Limnodynastidae Lynch, 1969 (extant flag source)
Magilidae Thiele, 1925 accepted as Muricidae Rafinesque, 1815 (extant flag source)
Megaladapidae Forsyth Major, 1894 accepted as Lemuridae Gray, 1821 (extant flag source)
Mephitidae Bonaparte, 1845 (extant flag source)
Neobalaenidae Gray, 1873 (extant flag source)
Neptuneidae Stimpson, 1865 accepted as Buccinidae Rafinesque, 1815 (extant flag source)
Ophiolepis Müller & Troschel, 1840 (extant flag source)
Pattersonia J.F. Gmelin, 1792 accepted as Ruellia Linnaeus, 1753 (extant flag source)
Peltaster Verrill, 1899 (extant flag source)
Peroryctidae Archer, Godthelp, Hand & Megirian, 1989 accepted as Peramelidae Gray, 1825 (extant flag source)
Pickworthiidae Iredale, 1917 (extant flag source)
Pisidium C. Pfeiffer, 1821 (extant flag source)
Pitheciidae Mivart, 1865 (extant flag source)
Potoroidae Gray, 1821 (extant flag source)
Scaphiopodidae Cope, 1865 (extant flag source)
Siliculidae Allen & Sanders, 1973 (extant flag source)
Sphaerium Scopoli, 1777 (extant flag source)