• Abditodentrix rhomboidalis (Millett, 1899) accepted as Tortoplectella rhomboidalis (Millett, 1899)
• Abedinium dasypus (Cachon & Cachon-Enjumet) Loeblich Jr & Loeblich III, 1966
• Abollifer prolabens Vørs, 1992
• Acanthostomella norvegica (Daday, 1887)
• Acanthostomella obtusa Kofoid & Campbell, 1929
• Acervulina inhaerens Schultze, 1854
• Achradina pulchra Lohmann, 1903 accepted as Monaster rete F.Schütt, 1895
• Acinetoides greeffii Plate, 1888 accepted as Hypocoma parasitica Gruber, 1884
• Acinetoides zoothamni Plate, 1888 accepted as Hypocoma parasitica Gruber, 1884
• Acinetospora crinita (Carmichael) Sauvageau, 1899
• Acrocytis groenlandica Rosenvinge
• Acrospongium ralfsioides Schiffner, 1916
• Acrothrix gracilis Kylin, 1907
• Acrothrix neglecta (Batters) Kuckuck, 1929 (uncertain)
• Actinema scutellum Reinsch, 1875
• Actiniscus pentasterias (Ehrenberg) Ehrenberg, 1844
• Actinomonas mirabilis Kent, 1880
• Adelosina bicornis (Walker & Jacob, 1798)
• Adelosina carinatastriata Wiesner, 1923 represented as Quinqueloculina carinatastriata (Wiesner, 1923)
• Adelosina cliarensis (Heron-Allen & Earland, 1930)
• Adelosina colomi (Le Calvez & Le Calvez, 1958)
• Adelosina depressa (d'Orbigny, 1852)
• Adelosina dubia (d'Orbigny in Fornasini, 1905)
• Adelosina dutemplei (d'Orbigny, 1846)
• Adelosina duthiersi Schlumberger, 1886
• Adelosina elegans (Williamson, 1858)
• Adelosina ferussacii (d'Orbigny, sp. Brady, 1884) (unaccepted > interim unpublished)
• Adelosina inconstans (Terquem, 1878) (uncertain > nomen dubium)
• Adelosina intricata (Terquem, 1878)
• Adelosina laevigata d'Orbigny, 1826
• Adelosina longirostra (d'Orbigny, 1826)
• Adelosina mediterranensis (Le Calvez & Le Calvez, 1958)
• Adelosina milletti Wiesner, 1923 accepted as Miliolina milletti Wiesner, 1912 accepted as Quinqueloculina milletti (Wiesner, 1912)
• Adelosina partschi (d'Orbigny, 1846) accepted as Adelosina partschii (d'Orbigny, 1846)
• Adelosina partschii (d'Orbigny, 1846)
• Adelosina phoenicia Martinotti, 1921
• Adelosina pulchella (d'Orbigny, 1826) accepted as Quinqueloculina pulchella d'Orbigny, 1826
• Adelosina pulchella d'Orbigny, 1846 accepted as Adelosina schreibersii (d'Orbigny, 1846)
• Adelosina schreibersii (d'Orbigny, 1846)
• Adelosina semistriata d'Orbigny, 1826
• Adenoides eludens (Herdman) Balech, 1956
• Adenoides kofoidii (Herdman) J.D.Dodge, 1982 accepted as Pseudadenoides kofoidii (Herdman) F.Gómez, R. Onuma, Artigas & Horiguchi, 2015
• Adercotryma glomerata (Brady, 1878) accepted as Adercotryma glomeratum (Brady, 1878)
• Adercotryma glomeratum (Brady, 1878)
• Adercotryma wrighti Brönnimann & Whittaker, 1987
• Adinimonas oviformis J.Schiller, 1928
• Adriogloia adriatica Ercegovic, 1955 (uncertain)
• Aduncodinium glandula (E.C.Herdman) N.S.Kang, H.J.Jeong & Moestrup, 2015 (uncertain)
• Affinetrina gualtieriana (d'Orbigny, 1839)
• Affinetrina planciana (d'Orbigny, 1839)
• Aglaozonia chilosa Falkenberg, 1879 accepted as Cutleria chilosa (Falkenberg) P.C.Silva, 1957
• Aglaozonia parvula (Greville) Zanardini, 1843 accepted as Cutleria multifida (Turner) Greville, 1830
• Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000
• Alabaminella weddellensis (Earland, 1936)
• Alaria esculenta (Linnaeus) Greville, 1830
• Alaria grandifolia J.Agardh, 1872 accepted as Alaria esculenta (Linnaeus) Greville, 1830
• Alaria pylaiei (Bory) Greville, 1830
• Alaria pylaii (Bory de Saint-Vincent) Greville, 1830 accepted as Alaria pylaiei (Bory) Greville, 1830
• Alepiella tricornuta Golemansky, 1970
• Alexandrium affine (H.Inoue & Y.Fukuyo) Balech, 1995
• Alexandrium angustitabulatum F.J.R.Taylor, 1995 accepted as Alexandrium minutum Halim, 1960
• Alexandrium balechii (Steidinger) Balech, 1995
• Alexandrium catenella (Whedon & Kofoid) Balech, 1985
• Alexandrium foedum Balech, 1990
• Alexandrium fundyense Balech, 1985 accepted as Alexandrium catenella (Whedon & Kofoid) Balech, 1985
• Alexandrium leei Balech, 1985
• Alexandrium minutum Halim, 1960
• Alexandrium monilatum (J.F.Howell) Balech, 1995
• Alexandrium ostenfeldii (Paulsen) Balech & Tangen, 1985
• Alexandrium pseudogonyaulax (Biecheler) Horiguchi ex K.Yuki & Y.Fukuyo, 1992
• Alexandrium tamarense (Lebour) Balech, 1995
• Alexandrium taylori Balech, 1994 accepted as Alexandrium taylorii Balech, 1994
• Alexandrium taylorii Balech, 1994
• Allantion tachyploon Sandon
• Allogromia crystallifera Dahlgren, 1962 accepted as Psammophaga crystallifera (Dahlgren, 1962)
• Allogromia laticollare Arnold, 1948 accepted as Allogromia laticollaris Arnold, 1948
• Allogromia laticollaris Arnold, 1948
• Allogromia mollis (Gruber, 1884)
• Allogromia ovoidea Rhumbler, 1904
• Alphamonas edax (Klebs) Alexieeff, 1924 (uncertain)
• Alveophragmium wiesneri (Parr, 1950) accepted as Veleroninoides wiesneri (Parr, 1950) accepted as Cribrostomoides wiesneri (Parr, 1950)
• Ammobaculites agglutinans (d'Orbigny, 1846)
• Ammobaculites americanus Cushman, 1910 accepted as Glaphyrammina americana (Cushman, 1910)
• Ammobaculites filiformis Earland, 1934
• Ammobaculites ponticus Mikhalevich, 1968
• Ammobaculites salsus Cushman & Brönnimann, 1948 accepted as Ammotium salsum (Cushman & Brönnimann, 1948) accepted as Ammotium morenoi (Acosta, 1940)
• Ammodiscoides catinus (Höglund, 1947) accepted as Arenoturrispirillina catinus (Höglund, 1947)
• Ammodiscus anguillae Höglund, 1947
• Ammodiscus catinus Höglund, 1947 accepted as Arenoturrispirillina catinus (Höglund, 1947)
• Ammodiscus flavidus Höglund, 1947
• Ammodiscus gullmarensis Höglund, 1948
• Ammodiscus incertus (d'Orbigny, 1839)
• Ammodiscus intermedius Höglund, 1947
• Ammodiscus minimus Höglund, 1947
• Ammodiscus planorbis Höglund, 1947
• Ammodiscus planus Höglund, 1947 accepted as Ammodiscus gullmarensis Höglund, 1948
• Ammodiscus rhumbleri Rottgardt, 1952
• Ammodiscus slesvicus Rottgardt, 1952
• Ammodiscus slevicus Rottgardt, 1952 accepted as Ammodiscus slesvicus Rottgardt, 1952
• Ammodiscus tenuis (Brady, 1881)