Ammotheidae Dohrn, 1881 (basis of record)
Ascorhynchidae Hoek, 1881 (basis of record)
Austrodecidae Stock, 1954 (basis of record)
Callipallenidae Hilton, 1942 (basis of record)
Colossendeidae Hoek, 1881 (basis of record)
Endeidae Norman, 1908 (basis of record)
Haliestidae Bamber, 2007 † (basis of record)
Haliestidae Bamber, 2007 † (extant flag source)
Nymphonidae Wilson, 1878 (basis of record)
Palaeoisopodidae Dubinin, 1957 † (basis of record)
Palaeopantopodidae Hedgpeth, 1955 † (basis of record)
Pallenopsidae Fry, 1978 (basis of record)
Phoxichilidiidae Sars, 1891 (basis of record)
Pycnogonidae Wilson, 1878 (basis of record)
Rhynchothoracidae Thompson, 1909 (basis of record)