Class Sorberacea Monniot, Monniot and Gaill, 1975 (deep water species, 890 meters and below)
Order Aspiraculata Monniot and Monniot, 1990
Family Oligotremidae (Oka, 1913)
Genus Gasterascidia Monniot and Monniot, 1968 (North and South Atlantic Ocean)
Genus Hexadactylus Monniot and Monniot, 1990(North and South Atlantic Ocean)
Genus Oligotrema Bourne, 1903 (northwestern Atlantic Ocean, Antarctic Ocean, west of New Caledonia)
Genus Sorbera Monniot and Monniot, 1974 (North and South Atlantic Ocean)