Euryleptidae Lang, 1884 accepted as
Euryleptidae Stimpson, 1857 (basis of record)
Fecampia Giard, 1886 (basis of record)
Fecampia abyssicola Christensen, 1981 (basis of record)
Fecampiidae Graff, 1903 (basis of record)
Hofsteniidae Bock, 1923 (basis of record)
Notoplana Laidlaw, 1903 (additional source)
Notoplanidae Marcus & Marcus, 1966 (basis of record)
Oligocladus Lang, 1884 (basis of record)
Pseudocerotidae Lang, 1884 (basis of record)
Thysanozoon Grube, 1840 (basis of record)
Tricladida (basis of record)
Taxonomy
Also in database as valid genus in Delphinidae, (Chordata) - needs checking [details]