Abaetuba Tourinho-Davis, 2004 (verified source for family)
Abaetuba Tourinho-Davis, 2004 (extant flag source)
Abaxisotima Gorochov, 2005 (verified source for family)
Abaxisotima Gorochov, 2005 (extant flag source)
Abaxisotima Gorochov, 2005 (habitat flag source)
Abbreviatocrinites Bohatý, 2005 † (verified source for family)
Abbreviatocrinites Bohatý, 2005 † (extant flag source)
Abdiacyclops Karanovic, 2005 (verified source for family)
Abdiacyclops Karanovic, 2005 (extant flag source)
Abdiacyclops Karanovic, 2005 (habitat flag source)
Abelbolla Huang & Zhang, 2004 (extant flag source)
Abelbolla Huang & Zhang, 2004 (habitat flag source)
Abelopsocus Schmidt & New, 2008 (verified source for family)
Abelopsocus Schmidt & New, 2008 (extant flag source)
Aberlencus Iwan, 2002 accepted as Angolositus Koch, 1955 (extant flag source)
Abilenea Wells, 2007 (verified source for family)
Abilenea Wells, 2007 (extant flag source)
Abilenea Wells, 2007 (habitat flag source)
Abirovulva Hunt, 2002 (extant flag source)
Ableptemetes Wiersema & McCafferty, 2003 (extant flag source)
Abolloptera Gnezdilov & O'Brien, 2006 (verified source for family)
Abolloptera Gnezdilov & O'Brien, 2006 (extant flag source)
Abolloptera Gnezdilov & O'Brien, 2006 (habitat flag source)
Abrimoides Kojima & Lyal, 2002 (extant flag source)
Abrimoides Kojima & Lyal, 2002 (habitat flag source)
Abrocossus Wang & Zhang, 2007 † (verified source for family)
Abrocossus Wang & Zhang, 2007 † (extant flag source)
Abromasta Day, 2003 † (habitat flag source)
Abrotoma Gao, Ren & Shih, 2009 † (verified source for family)
Abrotoma Gao, Ren & Shih, 2009 † (extant flag source)
Abrotoxyela Gao, Ren & Shih, 2009 † (verified source for family)
Abrotoxyela Gao, Ren & Shih, 2009 † (extant flag source)
Abyssoanthus Reimer & Fujiwara in Reimer, Sinniger, Fujiwara, Hirano & Maruyama, 2007 (verified source for family)
Abyssoanthus Reimer & Fujiwara in Reimer, Sinniger, Fujiwara, Hirano & Maruyama, 2007 (extant flag source)
Abyssoanthus Reimer & Fujiwara in Reimer, Sinniger, Fujiwara, Hirano & Maruyama, 2007 (habitat flag source)
Abyssoberyx Merrett & Moore, 2005 (habitat flag source)
Abyssophthalmus Schweitzer & Feldmann, 2009 † (habitat flag source)
Acaenorhinus Legalov, 2007 accepted as Caenorhinus Thomson, 1859 † (extant flag source)
Acaenorhinus Legalov, 2007 accepted as Caenorhinus Thomson, 1859 † (habitat flag source)
Acanthacanthus Valiukevičius, 2003 † (habitat flag source)
Acanthacidiplosis Fedotova, 2003 (extant flag source)
Acanthacidiplosis Fedotova, 2003 (habitat flag source)
Acanthanas Anker, Poddoubtchenko & Jeng, 2006 (habitat flag source)
Acanthaptinus Philips, 2005 (extant flag source)
Acantharhinocythere Tatman & Whatley, 2001 † (verified source for family)
Acantharhinocythere Tatman & Whatley, 2001 † (extant flag source)
Acantharhinocythere Tatman & Whatley, 2001 † (habitat flag source)
Acanthodaphne Bonfitto & Morassi, 2006 (extant flag source)
Acanthodavacarus Walter, 2004 (extant flag source)
Acantholobulus Felder & Martin, 2003 (habitat flag source)
Acanthomenexenus Brock & Hennemann, 2008 (verified source for family)
Acanthomenexenus Brock & Hennemann, 2008 (extant flag source)
Acanthonima Espinasa, 2005 (extant flag source)
Acanthoprimnoa Cairns & Bayer, 2004 (habitat flag source)
Acanthospina Valiukevičius, 2003 † (habitat flag source)
Acanthungella Ivanova & Hope, 2004 (extant flag source)
Acanthungella Ivanova & Hope, 2004 (habitat flag source)
Acapylarodepus Legalov, 2007 accepted as Capylarodepus Voss, 1922 (extant flag source)
Acapylarodepus Legalov, 2007 accepted as Capylarodepus Voss, 1922 (habitat flag source)
Acarapion Kissinger, 2005 (verified source for family)
Acarapion Kissinger, 2005 (extant flag source)
Acarapion Kissinger, 2005 (habitat flag source)
Acaricomes Pukall et al., 2006 (habitat flag source)
Acarotrochus Kawagata, 2005 (verified source for family)
Acarotrochus Kawagata, 2005 (extant flag source)
Acarotrochus Kawagata, 2005 (habitat flag source)
Acartorhynchites Legalov, 2007 accepted as Cartorhynchites Voss, 1958 † (extant flag source)
Acartorhynchites Legalov, 2007 accepted as Cartorhynchites Voss, 1958 † (habitat flag source)
Acaryon Hebauer, 2003 (extant flag source)
Acaryon Hebauer, 2003 (habitat flag source)
Acasilus Londt, 2005 (verified source for family)
Acasilus Londt, 2005 (extant flag source)
Acasilus Londt, 2005 (habitat flag source)
Acerovesiculomyia Fedotova, 2003 (extant flag source)
Acerovesiculomyia Fedotova, 2003 (habitat flag source)
Achaebana Attie, Bourgoin & Bonfils, 2002 (extant flag source)
Achemia Bordoni, 2003 (extant flag source)
Achmonia Bordoni, 2004 (extant flag source)
Achondrostoma Robalo, Almada, Levy & Doadrio, 2007 (habitat flag source)
Achrysopilus Zhang, Yang & Ren, 2008 † (verified source for family)
Achrysopilus Zhang, Yang & Ren, 2008 † (extant flag source)
Achuarmychus Tomaszewska & Leschen, 2004 (extant flag source)
Acinacistyla Fedotova & Sidorenko, 2006 (verified source for family)
Acinacistyla Fedotova & Sidorenko, 2006 (extant flag source)
Acinacistyla Fedotova & Sidorenko, 2006 (habitat flag source)
Acipensericola Bullard, Snyder, Jensen & Overstreet, 2008 (extant flag source)
Acipensericola Bullard, Snyder, Jensen & Overstreet, 2008 (habitat flag source)
Acipensericola Bullard, Snyder, Jensen & Overstreet, 2008 (verified source for family)
Acirrostylus Van Steeniste, Schockaert & Artois in Van Steenkiste, Volonterio, Schockaert & Artois, 2008 (verified source for family)
Acirrostylus Van Steeniste, Schockaert & Artois in Van Steenkiste, Volonterio, Schockaert & Artois, 2008 (extant flag source)
Ackermania C.H. Dodson & R. Escobar, 1993 (basis of record)
Ackermania C.H. Dodson & R. Escobar, 1993 (habitat flag source)
Acneminvolvulus Legalov, 2007 accepted as Cneminvolvulus Voss, 1960 † (extant flag source)
Acneminvolvulus Legalov, 2007 accepted as Cneminvolvulus Voss, 1960 † (habitat flag source)
Acorania López-Fé, 2006 (verified source for family)
Acorania López-Fé, 2006 (extant flag source)
Acorania López-Fé, 2006 (habitat flag source)
Acramoeba Smirnov, Nassonova & Cavalier-Smith, 2008 (verified source for family)
Acramoeba Smirnov, Nassonova & Cavalier-Smith, 2008 (extant flag source)
Acraspisoides Hill & Winterton, 2004 (habitat flag source)

 Taxonomic remark

 for Brochus Oken, 1838

Not listed in McKenna & Bell, 1997, but appears alongside "Trichechus" (presumably of Linnaeus, 1766, a synonym of ... [details]