Aberrantospermata Jondelius, Wallberg, Hooge & Raikova, 2011 (basis of record)
Acanthozoon albopapillosus Hyman, 1959 accepted as Acanthozoon albopapillosum Hyman, 1959 (basis of record)
Acanthozoon albopunctatus Prudhoe, 1978 accepted as Acanthozoon albopunctatum Prudhoe, 1978 (basis of record)
Acanthozoon hispidus Du Bois-Reymond Marcus, 1955 accepted as Acanthozoon hispidum (Du Bois-Reymond Marcus, 1955) (basis of record)
Acanthozoon micropapillosus (Kato, 1934) accepted as Pseudoceros micropapillosus Kato, 1934 (basis of record)
Acanthozoon nigropapillosus Hyman, 1959 accepted as Thysanozoon nigropapillosum (Hyman, 1959) (basis of record)
Acanthozoon papilio (Kelaart, 1858) accepted as Acanthozoon papilionis (Kelaart, 1858) (basis of record)
Acerotisa alba Freeman, 1933 (basis of record)
Acerotisa maculata (Hallez, 1905) (basis of record)
Acotylina accepted as Acotylea (basis of record)
Acrochordonoposthia vandeputae Houben, Proesmans & Artois, 2014 (basis of record)
Acrorhynchina Graff, 1882 accepted as Acrorhynchidinae Evdonin, 1977 (basis of record)
Acrorhynchus Graff, 1882 accepted as Acrorhynchides Strand, 1928 (additional source)
Acrumenidae Karling, 1980 accepted as Acrumeninae Karling, 1980 (additional source)
Aculeorhynchidae Schilke, 1969 (additional source)
Alcha Marcus, 1949 (additional source)
Allogenus sluysi Volonterio & Berwin, 2013 (basis of record)
Amakusaplana acroporae Rawlinson, Gillis, Billings & Borneman, 2011 accepted as Prosthiostomum acroporae (Rawlinson, Gillis, Billings & Borneman, 2011) (basis of record)
Amakusaplana ohshimai Kato, 1938 accepted as Prosthiostomum ohshimae (Kato, 1938) (basis of record)
Ancoratheca pacifica Bock, 1923 accepted as Neostylochus pacificus Bock, 1923 (basis of record)
Anisorhynchodemus Kawakatsu, Froehlich, Jones, Ogren & Sasaki, 2003 (basis of record)
Anisorhynchodemus albicinctus (Graff, 1899) (basis of record)
Anisorhynchodemus amboinensis (Graff, 1899) (basis of record)
Anisorhynchodemus assimilis (Geba, 1909) (basis of record)
Anisorhynchodemus belli (Graff, 1899) (basis of record)
Anisorhynchodemus bistriatus (Grube, 1868) (basis of record)
Anisorhynchodemus boehmigi (Graff, 1898) (basis of record)
Anisorhynchodemus boholicus (Graff, 1899) (basis of record)
Anisorhynchodemus borelli (Graff, 1894) (basis of record)
Anisorhynchodemus bosci (Graff, 1899) (basis of record)
Anisorhynchodemus cameliae (Fuhrmann, 1912) (basis of record)
Anisorhynchodemus chuni (Graff, 1899) (basis of record)
Anisorhynchodemus conradti (Graff, 1899) (basis of record)
Anisorhynchodemus conspersus (Graff, 1899) (basis of record)
Anisorhynchodemus cultratus (Graff, 1898) (basis of record)
Anisorhynchodemus demani (Graff, 1899) (basis of record)
Anisorhynchodemus diesingi (Graff, 1899) (basis of record)
Anisorhynchodemus diorchis (Fuhrmann, 1914) (basis of record)
Anisorhynchodemus dubius (Spencer, 1892) (basis of record)
Anisorhynchodemus dugesi (Graff, 1899) (basis of record)
Anisorhynchodemus excavatus (Graff, 1899) (basis of record)
Anisorhynchodemus figdori (Graff, 1899) (basis of record)
Anisorhynchodemus fletcheri (Spencer, 1892) (basis of record)
Anisorhynchodemus forrestianus (Schröder, 1924) (basis of record)
Anisorhynchodemus gebaboehmigi Kawakatsu, Froehlich, Jones, Ogren & Sasaki, 2003 (basis of record)
Anisorhynchodemus guttatus (Fletcher & Hamilton, 1888) (basis of record)
Anisorhynchodemus hallezi (Graff, 1899) (basis of record)
Anisorhynchodemus insularis (Graff, 1899) (basis of record)
Anisorhynchodemus joubini (Hallez, 1894) (basis of record)
Anisorhynchodemus kraepelini (Graff, 1899) (basis of record)
Anisorhynchodemus laterolineatus (Spencer, 1892) (basis of record)
Anisorhynchodemus leidyi (Graff, 1899) (basis of record)
Anisorhynchodemus lindsaysianus (Schröder, 1924) (basis of record)
Anisorhynchodemus lineolatus (Graff, 1899) (basis of record)
Anisorhynchodemus lubbocki (Graff, 1899) (basis of record)
Anisorhynchodemus luteicollis (Graff, 1899) (basis of record)
Anisorhynchodemus maculatus (Fuhrmann, 1912) (basis of record)
Anisorhynchodemus mediolineatus (Spencer, 1892) (basis of record)
Anisorhynchodemus megalophthalma (Loman, 1890) (basis of record)
Anisorhynchodemus mertoni (Schröder, 1916) (basis of record)
Anisorhynchodemus michaelsoni (Graff, 1899) (basis of record)
Anisorhynchodemus miniatus (Graff, 1899) (basis of record)
Anisorhynchodemus mitchellianus (Schröder, 1924) (basis of record)
Anisorhynchodemus montanus (Mell, 1904) (basis of record)
Anisorhynchodemus moseleyi (Fletcher & Hamilton, 1888) (basis of record)
Anisorhynchodemus nematoides (Loman, 1890) (basis of record)
Anisorhynchodemus nietneri (Humbert & Claparede, 1862) (basis of record)
Anisorhynchodemus niger (Fletcher & Hamilton, 1888) (basis of record)
Anisorhynchodemus nolli (Graff, 1899) (basis of record)
Anisorhynchodemus obscurus (Fletcher & Hamilton, 1888) (basis of record)
Anisorhynchodemus pellucidus (Graff, 1899) (basis of record)
Anisorhynchodemus picta (Graff, 1899) (basis of record)
Anisorhynchodemus pilleata (Whitehouse, 1915) (basis of record)
Anisorhynchodemus procera (Graff, 1899) (basis of record)
Anisorhynchodemus putzei (Graff, 1899) (basis of record)
Anisorhynchodemus quadristriatus (Grube, 1868) (basis of record)
Anisorhynchodemus rubrocinctus (Graff, 1899) (basis of record)
Anisorhynchodemus scriptus (Steel, 1897) (basis of record)
Anisorhynchodemus septemstriatus (Graff, 1899) (basis of record)
Anisorhynchodemus sharpi (Graff, 1899) (basis of record)
Anisorhynchodemus signata (Graff, 1899) (basis of record)
Anisorhynchodemus simulans (Dendy, 1891) (basis of record)
Anisorhynchodemus stenopus (Graff, 1894) (basis of record)
Anisorhynchodemus tabatteldili (Graff, 1899) (basis of record)
Anisorhynchodemus tetracelis (Haslauer-Gamisch, 1981) (basis of record)
Anisorhynchodemus trilineatus (Fletcher & Hamilton, 1888) (basis of record)
Anisorhynchodemus tristis (Graff, 1899) (basis of record)
Anisorhynchodemus varians (Graff, 1899) (basis of record)
Anisorhynchodemus waburtonianus (Schröder, 1924) (basis of record)
Anisorhynchodemus whiteleggei (Spencer, 1892) (basis of record)
Anisorhynchodemus woodassimilis Kawakatsu, Froehlich, Jones, Ogren & Sasaki, 2003 (basis of record)
Annalisella Karling, 1978 (additional source)
Annulorhynchus Karling, 1956 (additional source)
Antiboreorhynchus Karling, 1952 (additional source)
Anzoplanini Winsor, 2006 (basis of record)
Aphanostoma pisae Zauchner, Salvenmoser & Egger, 2015 accepted as Praeconvoluta pisae (Zauchner, Salvenmoser & Egger, 2015) (basis of record)
Apidioplana apluda Cannon, 1990 (basis of record)
Apidioplana okadai Kato, 1944 (basis of record)
Archaphanostoma fontaneti Kånneby, Bernvi & Jondelius, 2015 accepted as Baltalimania fontaneti (Kånneby, Bernvi & Jondelius, 2015) (basis of record)
Archaphanostoma occulta Kånneby, Bernvi & Jondelius, 2015 accepted as Baltalimania occulta (Kånneby, Bernvi & Jondelius, 2015) (basis of record)