Acallocheirus Bird & Bamber, 2013 (basis of record)
Acallocheirus echmanomus Bird & Bamber, 2013 (basis of record)
Acanthapseudes Roman, 1976 (basis of record)
Acanthapseudes elegans Roman, 1976 (basis of record)
Acanthapseudes hansgeorgmuelleri Gutu, 2010 (basis of record)
Acinoproskelos Bamber & Błażewicz-Paszkowycz, 2013 (basis of record)
Acinoproskelos vermes Bamber & Błażewicz-Paszkowycz, 2013 (basis of record)
Actenos Bamber, 2013 (basis of record)
Actenos kalimantus Bamber, 2013 (basis of record)
Actenos marshalli Bamber, 2013 (basis of record)
Actenos tenuicorporeus (Shiino, 1963) (basis of record)
Acutihumerus Gutu, 2006 (basis of record)
Acutihumerus cavooreni (Bacescu & Absalao, 1985) (basis of record)
Acutihumerus petronius Araújo-Silva & Larsen, 2010 (basis of record)
Agathotanaidae Lang, 1971 (basis of record)
Agathotanais Hansen, 1913 (additional source)
Agathotanais ahyongi Larsen, 1999 (basis of record)
Agathotanais brevis Kudinova-Pasternak, 1990 (basis of record)
Agathotanais ghilarovi Kudinova-Pasternak, 1989 (basis of record)
Agathotanais hadalis Larsen, 2007 (basis of record)
Agathotanais hanseni Lang, 1971 (basis of record)
Agathotanais ingolfi Hansen, 1913 (additional source)
Agathotanais manganicus Larsen, 1999 (basis of record)
Agathotanais spinipoda Larsen, 1999 (basis of record)
Agathotanais splendidus Kudinova-Pasternak, 1970 (basis of record)
Akanthoparapseudes Heard & Morales-Núñez, 2011 (basis of record)
Akanthoparapseudes alfaroae Heard & Morales-Núñez, 2011 (basis of record)
Akanthophoreidae Sieg, 1986 (basis of record)
Akanthophoreus Sieg, 1986 (additional source)
Akanthophoreus gracilis (Krøyer, 1842) (additional source)
Akanthophoreus lispopygmos Błażewicz-Paszkowycz, Bamber & Jóźwiak, 2013 (basis of record)
Akanthophoreus phillipsi (Sieg & Dojiri, 1991) (basis of record)
Akanthophoreus undulatus Bird, 2007 (basis of record)
Alavatanaidae Vonk & Schram, 2007 † (basis of record)
Alavatanais Vonk & Schram, 2007 † (basis of record)
Alavatanais carabe Vonk & Schram, 2007 † (basis of record)
Allodaposia Sieg, 1986 (basis of record)
Allodaposia abbreviata (Vanhöffen, 1914) (basis of record)
Allotanais Shiino, 1978 (basis of record)
Allotanais hirsutus (Beddard, 1886) (basis of record)
Alokalliapseudes Gutu, 2006 accepted as Mesokalliapseudes Lang, 1956 (basis of record)
Alokalliapseudes macsweenyi (Drumm, 2003) accepted as Mesokalliapseudes macsweenyi Drumm, 2003 (basis of record)
Anarthrura Sars, 1882 (additional source)
Anarthrura edentatus Bird, 2004 (basis of record)
Anarthrura simplex Sars, 1882 (additional source)
Anarthrurella Bird, 2004 (basis of record)
Anarthrurella clairae Bird, 2004 (basis of record)
Anarthruridae Lang, 1971 (additional source)
Anarthruropsis Lang, 1968 (basis of record)
Anarthruropsis edentula Larsen, 2005 (basis of record)
Anarthruropsis galatheae Lang, 1968 (basis of record)
Anarthruropsis langi Kudinova-Pasternak, 1976 (basis of record)
Anarthruropsis longa Kudinova-Pasternak, 1984 (basis of record)
Anarthruropsis similis Kudinova-Pasternak, 1990 (basis of record)
Anatanaini Sieg, 1980 (additional source)
Anatanais Nordenstam, 1930 (basis of record)
Anatanais lineatus Nordenstam, 1930 (basis of record)
Anatanais pseudonormani Sieg & Winn, 1981 in Sieg, 1980 (basis of record)
Andrognathia Sieg, 1983 (basis of record)
Andrognathia plumosa Sieg, 1983 (basis of record)
Androtanais Sieg, 1976 (basis of record)
Androtanais beebei (Van Name, 1925) (basis of record)
Anisopechys Bird, 2004 (basis of record)
Anisopechys crinitus Bird, 2004 (basis of record)
Ansphyrapus Gutu, 2001 (basis of record)
Ansphyrapus tudes (Norman & Stebbing, 1886) (basis of record)
Anthracocarididae Brooks, 1962 emend. Schram, 1979 † (basis of record)
Anthracocaridomorpha † (basis of record)
Anthracocaris Calman, 1933 † (basis of record)
Anthracocaris scotica (Peach, 1882) † (basis of record)
Antiplotanais Bamber, 2008 (basis of record)
Antiplotanais actuarius Błażewicz-Paszkowycz & Bamber, 2012 (basis of record)
Antiplotanais coochimudlo Bamber, 2008 (basis of record)
Antiplotanais lutze (Bamber, 2005) (basis of record)
Aparatanais Bird & Bamber, 2013 (basis of record)
Aparatanais denticulatus (Gutu & Ramos, 1995) (basis of record)
Aparatanais intermedius (Dojiri & Sieg, 1997) (basis of record)
Aparatanais lenoprimorum Tzeng & Hsueh, 2014 (basis of record)
Aparatanais malignus (Larsen, 2001) (basis of record)
Aparatanais spinanotandus (Sieg, 1981) (basis of record)
Aparatanais timutimu Bird & Bamber, 2013 (basis of record)
Aparatanais vicentetis (Larsen, 2012) (basis of record)
Aponychos Bamber, Chatterjee & Marshall, 2012 (basis of record)
Aponychos hyperaesthesia Bamber, Chatterjee & Marshall, 2012 (basis of record)
Apseudella Lang, 1968 (basis of record)
Apseudella typica Lang, 1968 (basis of record)
Apseudellidae Gutu, 1972 (basis of record)
Apseudes Leach, 1814 (basis of record)
Apseudes (Tuberapseudes) Bacescu & Gutu, 1971 accepted as Tuberapseudes Bacescu & Gutu, 1971 (basis of record)
Apseudes (Tuberapseudes) echinatus Sars, 1882 accepted as Tuberapseudes echinatus (Sars, 1882) (basis of record)
Apseudes abditospina (Blazewicz-Paszkowycz & Bamber, 2007) (basis of record)
Apseudes acutifrons Sars, 1882 accepted as Apseudopsis acutifrons (Sars, 1882) (additional source)
Apseudes africanus Tattersall, 1925 (basis of record)
Apseudes agulhensis Barnard, 1920 (basis of record)
Apseudes aisoe Araújo-Silva, Coelho & Larsen, 2013 (basis of record)
Apseudes albidus Bacescu, 1984 (basis of record)
Apseudes armatus Richardson, 1911 (basis of record)
Apseudes atuini Bamber, 2005 (basis of record)
Apseudes batillus Bamber, 2007 (basis of record)
Apseudes browni Bacescu, 1980 (basis of record)