Acanthomacrostomum Papi & Swedmark, 1959 (basis of record)
Acanthomacrostomum spiculiferum Papi & Swedmark, 1959 (basis of record)
Acerotisa Strand, 1928 (basis of record)
Acerotisa typhla (Bock, 1913) (basis of record)
Acestoplana Faubel, 1983 (basis of record)
Acestoplana raffaelei (Ranzi, 1928) (basis of record)
Achoerus Beklemischev, 1914 (basis of record)
Achoerus pachycaudatus Dörjes, 1968 (basis of record)
Acmostomum Schmarda, 1859 (basis of record)
Acmostomum dioicum Metschnikoff, 1865 (basis of record)
Acrorhynchides Strand, 1928 (basis of record)
Acrorhynchides caledonicus (Claperede, 1861) Strand, 1928 (basis of record)
Acrorhynchides robustus (Karling, 1931) Strand, 1928 (basis of record)
Acrumena Brunet, 1965 (basis of record)
Acrumena massiliensis Brunet, 1965 (basis of record)
Actinoposthia An der Lan, 1936 (basis of record)
Actinoposthia biaculeata Faubel, 1974 (basis of record)
Actinoposthia longa Faubel, 1976 (basis of record)
Actinoposthia pigmentea Faubel, 1976 (basis of record)
Aculeorhynchidae Schilke, 1969 (basis of record)
Aculeorhynchus Schilke, 1969 (basis of record)
Aculeorhynchus glandulis Schilke, 1969 (basis of record)
Adenocauda Dörjes, 1968 (basis of record)
Adenocauda helgolandica Dörjes, 1968 (basis of record)
Adenopea Antonius, 1968 (basis of record)
Adenopea chuni (Brauner, 1920) (basis of record)
Adenopea illardata Löhner & Micoletzky, 1911 (basis of record)
Adenopharynx Ehlers, 1972 (basis of record)
Adenopharynx mitrabursalis Ehlers, 1972 (basis of record)
Adenorhynchus Meixner, 1938 (basis of record)
Adenorhynchus balticus Meixner, 1938 (basis of record)
Afronta Hyman, 1944 (basis of record)
Afronta rubra Faubel, 1976 (basis of record)
Alexlutheria Karling, 1956 (basis of record)
Alexlutheria acrosiphoniae Karling, 1956 (basis of record)
Allostoma Beneden, 1861 (basis of record)
Allostoma catinosum (Beklemischev, 1927) Mack Fira, 1974 (basis of record)
Allostoma neostiliferum Karling, 1993 (basis of record)
Allostoma pallidum Beneden, 1861 (basis of record)
Allostoma uterinum (Westblad, 1952) (basis of record)
Alluna Faubel & Regier, 1983 (basis of record)
Alluna sublitoralis Faubel & Regier, 1983 (basis of record)
Amphirhynchus Schilke, 1970 (basis of record)
Amphirhynchus caudatus Schilke, 1970 (basis of record)
Amphiscolops Graff, 1904 (basis of record)
Amphiscolops cinereus (Graff, 1874) (basis of record)
Amphiscolops mosaicus Kozloff, 1998 (basis of record)
Amphiscolops zeii Riedl, 1956 (basis of record)
Anaperus Graff, 1911 accepted as Thalassoanaperus Hernandez, 2018 (basis of record)
Anaperus tvaerminnensis (Luther, 1912) accepted as Thalassoanaperus tvaerminnensis (Luther, 1912) (basis of record)
Ancistrorhynchus L'Hardy, 1963 (basis of record)
Ancistrorhynchus ischnurus L'Hardy, 1963 (basis of record)
Annulorhynchus Karling, 1956 (basis of record)
Annulorhynchus adriaticus Karling, 1956 (basis of record)
Anonymidae Lang, 1884 (basis of record)
Anonymus Lang, 1884 (basis of record)
Anonymus virilis Lang, 1884 (basis of record)
Anoplodiera Westblad, 1930 (basis of record)
Anoplodiera voluta Westblad, 1930 (basis of record)
Anoplodiopsis Westblad, 1953 (basis of record)
Anoplodiopsis gracilis (Wahl, 1906) Westblad, 1953 (basis of record)
Anoplodium Schneider, 1858 (basis of record)
Anoplodium chirodotae Sabussow, 1900 (basis of record)
Anoplodium graffi Monticelli, 1892 (basis of record)
Anoplodium stichopi Bock, 1925 (basis of record)
Anthopharynx Karling, 1940 (basis of record)
Anthopharynx sacculipenis Ehlers, 1972 (basis of record)
Anthopharynx vaginatus Karling, 1940 (basis of record)
Antigonaria Dörjes, 1968 (basis of record)
Antigonaria arenaria Dörjes, 1968 (basis of record)
Antigonariidae Dörjes, 1968 (basis of record)
Antromacrostomum Faubel, 1974 (basis of record)
Antromacrostomum armatum Faubel, 1974 (basis of record)
Antroposthia Faubel, 1974 (basis of record)
Antroposthia axi Faubel, 1974 (basis of record)
Antroposthia unipora Faubel, 1974 (basis of record)
Antroposthiidae Faubel, 1976 (basis of record)
Aphanostoma Ørsted, 1845 (basis of record)
Aphanostoma adherens Meixner, 1938 (basis of record)
Aphanostoma album Dörjes, 1968 (basis of record)
Aphanostoma cavernosum Meixner, 1938 (basis of record)
Aphanostoma elegans Jensen, 1878 (basis of record)
Aphanostoma fuscum Meixner, 1938 (basis of record)
Aphanostoma virescens Ørsted, 1845 (basis of record)
Archactinoposthia Dörjes, 1968 (basis of record)
Archactinoposthia pelophila Dörjes, 1968 (basis of record)
Archilina Ax, 1959 (basis of record)
Archilina brachycirrus Martens & Curini-Galletti, 1994 (basis of record)
Archilina caliban Martens & Curini-Galletti, 1994 (basis of record)
Archilina deceptoria Martens & Curini-Galletti, 1994 (basis of record)
Archilina endostyla Ax, 1959 (basis of record)
Archilina etrusca Martens & Curini-Galletti, 1994 (basis of record)
Archilina selenifera Martens & Curini-Galletti, 1994 (basis of record)
Archiloa de Beauchamp, 1910 (basis of record)
Archiloa petiti Ax, 1956 (basis of record)
Archiloa rivularis de Beauchamp, 1910 (basis of record)
Archilopsis Meixner, 1938 (basis of record)
Archilopsis arenaria Martens, Curini-Galletti & Pucinelli, 1989 (basis of record)
Archilopsis marifuga Martens, Curini-Galletti & Pucinelli, 1989 (basis of record)
Archilopsis spinosa (Jensen, 1878) Martens, Curini-Galletti & Puccinelli, 1989 (basis of record)