Aafrita Szwedo & Azar in Szwedo, Azar & Nohra, 2013 † (basis of record)
Aatotomus Rankin, 2014 † (basis of record)
Abajudon Angielczyk, Huertas, Smith, Tabor, Sidor, Steyer, Tsuji & Gostling, 2014 † (basis of record)
Abdalodon Kammerer, 2016 † (basis of record)
Abyssomedon MacDougall & Reisz, 2014 † (basis of record)
Acaciacapsus Cassis & Symonds, 2014 (basis of record)
Acangarana Nascimento & Bravo, 2018 (basis of record)
Acanthorintes Cohn, Swanson & Fontana, 2014 (basis of record)
Acanthosalenia Nicolleau, Martinez & Vadet, 2014 † (basis of record)
Aceroryctes Rankin & Holroyd, 2014 † (basis of record)
Acisarcuatus Liu, Zhang, Yao & Ren, 2014 † (basis of record)
Ackbaria Campodonico & Zahniser, 2017 (basis of record)
Acromegalomma Gil & Nishi, 2017 (basis of record)
Acrophallonia Lehrer, 2012 (basis of record)
Acrophytidae McFadden & van Ofwegen, 2017 (basis of record)
Acrospina Cavalier-Smith in Scoble & Cavalier-Smith, 2014 accepted as Paraphysomonas De Saedeleer, 1930 (basis of record)
Acuminatella Orchard, 2013 † (basis of record)
Acupipora Gorjunova & Weiss, 2012 † (basis of record)
Acutalamna Guinot & Carrillo-Briceño, 2018 † (basis of record)
Acutobalteus Betts, Paterson, Jago, Jacquet, Skovsted, Topper & Brock, 2017 † (basis of record)
Adamanteryon Audo, Schweigert, Saint Martin & Charbonnier, 2014 † (basis of record)
Adelaeus Ratcliffe, 2014 (basis of record)
Adeliellidae Lowry & Myers, 2017 (basis of record)
Admirandopora Ariunchimeg, 2012 † (basis of record)
Adustonotus Bianchi in Bianchi et al., 2016 (basis of record)
Adventochoristites Poletaev, 2012 † (basis of record)
Aegirocassis Van Roy, Daley & Briggs, 2015 † (basis of record)
Aegyptiaris Abdelhamid & Abdelghany, 2015 † (basis of record)
Aegyptoclypeus Boukhary, Abul-Nasr & Al Menoufy in Boukhary et al., 2013 † (basis of record)
Aegyptoleberis Boukhary, Bassiouni & Sharabi in Boukhary et al., 2013 † (basis of record)
Aegyptonycteridae Simmons, Seiffert & Gunnell, 2016 † (basis of record)
Aegyptonycteris Simmons, Seiffert & Gunnell, 2016 † (basis of record)
Aenigmatinea Kristensen & Edwards in Kristensen et al., 2015 (basis of record)
Aenigmatineidae Kristensen & Edwards in Kristensen et al., 2015 (basis of record)
Aerodactylus Vidovic & Martill, 2014 † (basis of record)
Afroblepharida Biondi & D'Alessandro in Biondi et al., 2017 accepted as Blepharidina Bechyne, 1968 (basis of record)
Afrodialox Chetverikov & Craemer, 2017 (basis of record)
Afromelitta Michez & Kuhlmann in Michez, Kuhlmann & Dellicour, 2014 accepted as Melitta Kirby, 1802 (basis of record)
Afrorudolphia Bolz & Wagner, 2014 (basis of record)
Agapia Kopylov, 2012 † (basis of record)
Agapteron Kopylov, 2012 † (basis of record)
Agaresuchus Narváez, Brochu, Escaso, Pérez-García & Ortega, 2016 † (basis of record)
Agnatis Opitz, 2014 (basis of record)
Agnocarcinus Beschin, De Angeli, Checchi & Zarantonello, 2012 † (basis of record)
Aidabella Urra, 2014 (basis of record)
Ailiidae Wang et al., 2016 (basis of record)
Airophrys Hughes & Thomas, 2014 † (basis of record)
Akardita La Perna, Brunetti & Della Bella, 2018 † (basis of record)
Akonesis Opitz, 2014 (basis of record)
Akrikoides Hylleberg, 2014 accepted as Aspidosiphon Diesing, 1851 (basis of record)
Alberticarcinus Beschin, De Angeli, Checchi & Zarantonello, 2012 † (basis of record)
Alekseevites Gorjunova, 2011 † (basis of record)
Alexandrinia Sinitshenkova & Vassilenko, 2012 † (basis of record)
Algaeformis Anfimov, 2012 † (basis of record)
Aliaga Cuenca-Bescós, Canudo, Gasca, Moreno-Azanza & Cifelli, 2014 † (basis of record)
Alicantina Soldan, Petrizzo & Premoli Silva, 2018 † (basis of record)
Alienoptera † accepted as Blattodea (basis of record)
Alienopteridae Bai, Beutel, Klass, Wipfler & Zhang in Bai et al., 2016 † (basis of record)
Alienopterus Bai, Beutel, Klass, Wipfler & Zhang in Bai et al., 2016 † (basis of record)
Alienosternus Lackner, 2016 accepted as Phoxonotus Marseul, 1862 (basis of record)
Aliocis Sandoval-Gómez & Lopes-Andrade, 2015 (basis of record)
Alippistrongylus Digiani & Kinsella, 2014 (basis of record)
Allensundholmia Ślipiński & Escalona in Ślipiński, 2016 (basis of record)
Allodaposuchidae Narváez, Brochu, Escaso, Pérez-García & Ortega, 2015 † (basis of record)
Alloglossidiidae Hernández-Mena, Mendoza-Garfias, Ornelas-García & Pérez-Ponce de León, 2016 (basis of record)
Alloiocyprideidae Ayress & Whatley, 2014 † (basis of record)
Allomalorhagida (basis of record)
Allotimareta Zimmerman & Oberprieler, 2014 (basis of record)
Alpinalona Alonso & Sinev, 2017 (basis of record)
Altarianta Schileyko, 2013 accepted as Arianta Turton, 1831 (basis of record)
Altholepidiformes † (basis of record)
Altigibbaspis Liu, Gai & Zhu, 2018 (basis of record)
Altumia Benayahu, McFadden & Shoham, 2017 (basis of record)
Amandalotus Zimmerman & Oberprieler, 2014 (basis of record)
Amazochroma Carvalho & Kury, 2018 (basis of record)
Ambasiidae Lowry & Myers, 2017 (basis of record)
Ambercyclus Ferrari, Kaim & Damborenea, 2014 † (basis of record)
Ambergrisichnus Monaco, Baldanza, Bizzarri, Famiani, Lezzerini & Sciuto, 2014 † (basis of record)
Amphisphaeridae Suzuki in Matsuzaki et al., 2015 † (basis of record)
Amplectister Caterino & Maddison, 2018 † (basis of record)
Amynaskolia Figuerola, Gordon & Cristobo, 2018 (basis of record)
Anaeramoeba Táborský, Pánek & Čepička, 2017 (basis of record)
Anaeramoebidae Táborský, Pánek & Čepička, 2017 (basis of record)
Anansi Benavides & Hormiga in Benavides et al., 2017 (basis of record)
Anaspidesidae Ahyong & Alonso-Zarazaga, 2017 (basis of record)
Anchialocarididae Mejía-Ortíz, Yañez & López-Mejía, 2017 (basis of record)
Anchialocaris Mejía-Ortíz, Yañez & López-Mejía, 2017 (basis of record)
Ancoracarus Takahashi, Misumi & Takahashi, 2012 (basis of record)
Ancoridae Simdyanov in Simdyanov et al., 2017 (basis of record)
Anemozara Gorochov, 2014 (basis of record)
Anetshella Mazaev, 2012 † (basis of record)
Anetshellidae Mazaev, 2012 † (basis of record)
Anetshelloida † (basis of record)
Angarestia Charbonnier, Garassino, Schweigert & Simpson, 2013 † (basis of record)
Angulamoeba Berney, Bass & Geisen in Berney et al., 2015 (basis of record)
Angulamoebidae Cavalier-Smith in Cavalier-Smith, Chao & Lewis, 2016 (basis of record)
Anguloderus Anichtchenko & Sciaky, 2017 (basis of record)
Anisophlugis Chamorro-Rengifo & Olivier, 2017 (basis of record)
Ankalodouidae Shu, Conway Morris, Han, Hoyal Cuthill, Zhang, Cheng & Huang, 2017 † (basis of record)
Ankalodous Shu, Conway Morris, Han, Hoyal Cuthill, Zhang, Cheng & Huang, 2017 † (basis of record)

 Taxonomic remark

 for Adustonotus Bianchi in Bianchi et al., 2016

Year given as 2017 in ION/Zoological Record, however electronic version of work is dated 30 December 2016 and ... [details]

 Taxonomic remark

 for Awaouichthys Chatterjee & Mishra, 2013

Year given in ION as 2012. [details]

 Taxonomic remark

 for Bolong Wu, Godefroit & Hu, 2010 †

Year given as 2012 in ION, based in error on date of secondary source, "Research papers of dinosaurs in China". [details]

 Taxonomic remark

 for Electrotriaenodes Wichard, 2013 †

Misspelled Electrotrianodes in ION. [details]

 Taxonomic remark

 for Jiutaisaurus Wu, Dong, Sun, Li & Li, 2006 †

Year given as 2012 in ION, based in error on date of secondary source, "Research papers of dinosaurs in China". [details]

 Taxonomic remark

 for Keysercytheridae Karanovic & Brandão, 2014

Publication year given as 2015 in ION and in original work, 2014 in WoRMS (published online in 2014). [details]

 Taxonomic remark

 for Rubratelliidae Holzmann & Pawlowski, 2017

Listed in order Rotaliida in Holzmann & Pawlowski, 2017 and in Adl et al., 2018, but in Robertinida in WoRMS (2019 ... [details]

 Taxonomic remark

 for Sodaliatoma Háva, 2013

An additional entry is present in ION attributed to this publication, under the (mis-)spelling Sodaliotoma, however ... [details]