Coralliomyzontidae Humes & Stock, 1991 (source of synonymy)
Cyclopettidae Martínez Arbizu, 2000 (source of synonymy)
Dyspontiidae accepted as Artotrogidae Brady, 1880 (source of synonymy)
Giselinidae Martínez Arbizu, 2000 (source of synonymy)
Hemicyclopinidae Martínez Arbizu, 2001 (source of synonymy)
Parastenheliidae Lang, 1936 (source of synonymy)
Parkiidae Ferrari & Markaseva, 1996 (source of synonymy)
Psammocyclopinidae Martínez Arbizu, 2001 (source of synonymy)
Pseudopeltidiidae Poppe, 1891 accepted as Clytemnestridae A. Scott, 1909 (source of synonymy)
Rhynchothalestridae Lang, 1948 accepted as Thalestridae G.O. Sars, 1905 (source of synonymy)
Scottomyzontidae Ivanenko, Ferrari & Smurov, 2001 (source of synonymy)
Siphonostomatoida (awaiting allocation) (source of synonymy)
Trebiidae C.B. Wilson, 1905 (source of synonymy)