Aaptochiton Hoare & Karasawa, 2008 † (basis of record)
Aardonyx Yates, Bonnan, Neveling, Chinsamy & Blackbeard, 2010 † (basis of record)
Aaveqaspis Peel & Stein, 2009 † (basis of record)
Abaetetuba Tourinho-Davis, 2004 (basis of record)
Abagnostus Yang & Liu in Yang et al., 1991 † (basis of record)
Abaiba Martins & Napp, 2007 (basis of record)
Abauba Santos-Silva & Tavakilian, 2009 (basis of record)
Abaxinicephora Gorochov & Kang, 2005 (basis of record)
Abcandonopsis Karanovic, 2004 accepted as Candonopsis Vávra, 1891 (basis of record)
Abdosetae Fu, Zhang & MacDermott, 2010 (basis of record)
Abeoforma Marshall & Berbee, 2011 (basis of record)
Aberratiodontus Gong, Hou & Wang, 2004 † (basis of record)
Abes Fibiger, 2010 (basis of record)
Aborjinia Özdikmen, 2010 (basis of record)
Abrekites Shigeta & Zakharov, 2009 † (basis of record)
Abrekopsis Kaim, 2009 † (basis of record)
Abropelecinus Feng, Shih, Ren & Liu, 2010 † (basis of record)
Absensomina Cartwright, 2010 (basis of record)
Abulbaspis Zhou & Zhou, 2006 † (basis of record)
Abydosaurus Chure, Britt, Whitlock & Wilson, 2010 † (basis of record)
Acabyara Napp & Martins, 2006 (basis of record)
Acadiestheriella Kozur & Weems, 2010 † (basis of record)
Acamerobia Fan & Walter, 2011 (basis of record)
Acanthaktema Pace, 2008 accepted as Hydrosmecta Thomson, 1858 (basis of record)
Acanthatreta Streng, 1999 † (basis of record)
Acanthocasuarina Taylor in Taylor, Jennings, Purcell & Austin, 2011 (basis of record)
Acanthocollum Opitz, 2010 (basis of record)
Acanthocornis Monné & Monné, 2011 (basis of record)
Acanthomichelinoceras Kröger, Klug & Mapes, 2005 † (basis of record)
Acanthoneelidus Bretfeld & Griegel, 2006 (basis of record)
Acanthophaedusa Nordsieck, 2007 (basis of record)
Acanthoraculus Braun & Morris, 2009 (basis of record)
Acanthorota Kozur & Mostler, 2008 † (basis of record)
Acanthoschizorota Kozur & Mostler, 2008 † (basis of record)
Acanthotheca Vendrasco, Kouchinsky, Porter & Fernandez, 2011 † (basis of record)
Acanthotiphia Boni Bartalucci, 2011 accepted as Pseudotiphia Ashmead, 1903 (basis of record)
Acanthotretella Holmer & Caron, 2006 † (basis of record)
Acaricesa Koçak & Kemal, 2008 (basis of record)
Acaricis Beard & Gerson, 2009 (basis of record)
Acatinga Santos-Silva, Martins & Clarke, 2010 (basis of record)
Acerbitas Özdikmen, 2006 (basis of record)
Acerhacus Hoffmann, 2006 (basis of record)
Acerplica Waterhouse, 2008 † (basis of record)
Achaemenothrombium Saboori, Wohltmann & Hakimitabar, 2010 (basis of record)
Achaeridion Wunderlich, 2008 † (basis of record)
Achaiabracon Belokobylskij, 2009 (basis of record)
Achaiusoides Tereshkin, 2011 (basis of record)
Achelatrius Kirejtshuk & Azar in Kirejtshuk, Azar, Tafforeau, Boistel & Fernandez, 2009 † (basis of record)
Achelipoda Yang, Zhang & Zhang, 2007 (basis of record)
Acheroniotes Lohaj & Lakota, 2010 (basis of record)
Acherontisuchus Hastings, Bloch & Jaramillo, 2011 † (basis of record)
Achillesaurus Martinelli & Vera, 2007 † (basis of record)
Achorius Kuschel, 2008 (basis of record)
Aciculoplites Foissner & Gabilondo in Gabilondo & Foissner, 2009 (basis of record)
Aciculopoda Feldmann & Schweitzer, 2010 † (basis of record)
Acinacodus Lopatin, Mashchenko & Averianov, 2010 † (basis of record)
Acindrocephalus Keith & Delpont, 2004 accepted as Dicronocephalus Hope, 1837 (basis of record)
Acinodidemnum Varol, 2006 † (basis of record)
Acleistochelys Gaffney, Roberts, Sissoko, Bouare, Tapanila & O'Leary, 2007 † (basis of record)
Aclogryllus Gorokhov, 2009 accepted as Paragryllus Guérin-Méneville, 1844 (basis of record)
Acnephalomyia Londt, 2010 (basis of record)
Acolaspoides Moseyko, Kirejtshuk & Nel, 2010 † (basis of record)
Acompsophloeus Thomas, 2010 (basis of record)
Acorigone Wunderlich, 2008 (basis of record)
Acosma Yakovlev, 2011 (basis of record)
Acostinella Sarkar & Gupta, 2008 † (basis of record)
Acrecebus Kay & Cozzuol, 2006 † (basis of record)
Acristatherium Hu, Meng, Li & Wang, 2010 † (basis of record)
Acrodontopsis Alifanov, 2009 † (basis of record)
Acrolophyses Dellapé & Henry, 2010 (basis of record)
Acropermula Aristov & Storozhenko, 2011 † (basis of record)
Acrophyseter Lambert, Bianucci & de Muizon, 2008 † (basis of record)
Acropygorthezia LaPolla & Miller, 2008 (basis of record)
Acrorhizodus Cappetta, Buffetaut, Cuny & Suteethorn, 2006 † (basis of record)
Acrosembia Ross, 2006 (basis of record)
Acrosqualiolus Adnet, 2006 † (basis of record)
Acryptolechia Lvovsky, 2010 (basis of record)
Acsapseudoptynx Abraham & Meszaros, 2006 (basis of record)
Actinophlebioides Jepson, Makarkin & Jarzembowski, 2009 † (basis of record)
Actinothrix Reinert, Harbach & Kitching, 2009 accepted as Actinotryx Duchassaing & Michelotti, 1860 (basis of record)
Aculeodes Jałoszyński & Nomura, 2009 accepted as Cephennodes Reitter, 1884 (basis of record)
Acumyia Harris, 2008 (basis of record)
Acuodulodon Hu, Meng & Clark, 2007 † accepted as Dsungarodon Pfretzschner & Martin in Pfretzschner, Martin, Maisch, Matzke & Sun, 2005 † (basis of record)
Acusa Fibiger, 2011 (basis of record)
Acutiforcipia Seredszus & Wichard in Wichard, Gröhn & Seredszus, 2009 † accepted as Acutiforcipia Ashe & O'Connor, 2019 † (basis of record)
Acutodorcadion Danilevsky, Kasatkin & Rubenyan, 2005 accepted as Dorcadion Dalman in Schönherr, 1817 (basis of record)
Acutomeekoceras Jenks, Brayard, Brühwiler & Bucher, 2010 † (basis of record)
Adachia Evenhuis, 2005 (basis of record)
Adamanasuchus Lucas, Hunt & Spielmann, 2007 † (basis of record)
Adamantinasuchus Nobre & Carvalho, 2006 † (basis of record)
Adamantisaurus Santucci & Bertini, 2006 † (basis of record)
Adamasirad Afanasieva, 2009 † (basis of record)
Adamostenus Özdikmen & Darilmaz, 2008 accepted as Stenus Latreille, 1796 (basis of record)
Adapterops Frieser, 2010 (basis of record)
Adauctis Ignatyev & Zolotuhin, 2006 accepted as Dysauxes Hübner, 1819 (basis of record)
Adelphobates Grant, Frost, Caldwell, Gagliardo, Haddad, Kok, Means, Noonan, Schargel & Wheeler, 2006 (basis of record)
Ademirsoyus Özdikmen, 2008 (basis of record)
Adenodictyna Ono, 2008 (basis of record)
Adenticum Gantait & Chatterjee, 2007 accepted as Cephalobium Cobb, 1920 (basis of record)
Adiakonoffia Özdikmen, 2008 accepted as Gnathmocerodes Diakonoff, 1967 (basis of record)