Acanthocorbis apoda (Leadbeater) Hara & Takahashi, 1984 (additional source)
Acanthocorbis asymmetrica (Thomsen) Hara & Takahashi, 1984 (additional source)
Acanthocorbis campanula (Espeland) Thomsen, 1991 (additional source)
Acanthocorbis unguiculata (Thomsen) Hara & Takahashi, 1984 (additional source)
Acanthoecopsis unguiculata Thomsen, 1973 accepted as Acanthocorbis unguiculata (Thomsen) Hara & Takahashi, 1984 (additional source)
Acanthoica quattrospina Lohmann, 1903 (additional source)
Achnanthes Bory, 1822 (additional source)
Achnanthes taeniata Grunow, 1880 accepted as Pauliella taeniata (Grunow) F.E.Round & P.W.Basson, 1997 (additional source)
Actiniscus pentasterias (Ehrenberg) Ehrenberg, 1844 (additional source)
Actinocyclus curvatulus Janisch, 1874 (additional source)
Actinocyclus kützingii (A.Schmidt) Simonsen (additional source)
Actinocyclus normanii (Gregory) Hustedt, 1957 (additional source)
Actinocyclus normanii f. normanii (W. Gregory) Hustedt, 1957 accepted as Coscinodiscus normanii Gregory ex Greville, 1859 (additional source)
Actinocyclus normanii f. subsalsus (Juhlin-Dannfelt) Hustedt (additional source)
Actinocyclus octonarius Ehrenberg, 1837 accepted as Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (additional source)
Actinocyclus octonarius var. tenellus (Brébisson) Hendey, 1954 accepted as Eupodiscus tenellus Brébisson, 1854 (additional source)
Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinocyclus subtilis (W.Gregory) Ralfs, 1861 (additional source)
Actinomonas mirabilis Kent, 1880 (additional source)
Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinoptychus undulatus (J.W.Bailey) Ralfs, 1861 accepted as Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Adenoides eludens (Herdman) Balech, 1956 (additional source)
Alexandrium affine (H.Inoue & Y.Fukuyo) Balech, 1995 (additional source)
Alexandrium angustitabulatum F.J.R.Taylor, 1995 accepted as Alexandrium minutum Halim, 1960 (additional source)
Alexandrium balechii (Steidinger) Balech, 1995 (additional source)
Alexandrium catenella (Whedon & Kofoid) Balech, 1985 (additional source)
Alexandrium foedum Balech, 1990 (additional source)
Alexandrium fundyense Balech, 1985 accepted as Alexandrium catenella (Whedon & Kofoid) Balech, 1985 (additional source)
Alexandrium leei Balech, 1985 (additional source)
Alexandrium minutum Halim, 1960 (additional source)
Alexandrium monilatum (J.F.Howell) Balech, 1995 (additional source)
Alexandrium ostenfeldii (Paulsen) Balech & Tangen, 1985 (additional source)
Alexandrium pseudogonyaulax (Biecheler) Horiguchi ex K.Yuki & Y.Fukuyo, 1992 (additional source)
Alexandrium tamarense (Lebour) Balech, 1995 (additional source)
Alexandrium taylori Balech, 1994 accepted as Alexandrium taylorii Balech, 1994 (additional source)
Algirosphaera oryza Lecal-Schlauder, 1945 (additional source)
Algirosphaera quadricornu (Schiller) R.E.Norris, 1984 (additional source)
Algirosphaera robusta (Lohmann) R.E.Norris, 1984 (additional source)
Amphidiniopsis kofoidii Wołoszyńska, 1929 (additional source)
Amphidinium carterae Hulburt, 1957 (additional source)
Amphidinium klebsii Kofoid & Swezy, 1921 (additional source)
Amphidinium operculatum Claparède & Lachmann, 1859 (additional source)
Amphidinium poecilochroum J.Larsen, 1985 accepted as Nusuttodinium poecilochroum (J.Larsen) Y.Takano & T.Horiguchi, 2014 (additional source)
Amphiprora C.G. Ehrenberg, 1843 (additional source)
Amphisolenia bidentata B.Schröder, 1900 (additional source)
Amphisolenia globifera F.Stein, 1883 (additional source)
Amylax buxus (Balech) J.D.Dodge, 1989 accepted as Amylax triacantha var. buxus (Balech) Gárate-Lizárraga, 2014 (additional source)
Amylax diacantha Meunier, 1919 accepted as Sourniaea diacantha (Meunier) H.Gu., K.N.Mertens, Zhun Li & H.H.Shin, 2020 (additional source)
Amylax triacantha (Jørgensen) Sournia, 1984 (additional source)
Apedinella radians (Lohmann) P.H.Campbell, 1973 (additional source)
Arcocellulus cornucervis G.R.Hasle, H.A.von Stosch & E.E.Syvertsen, 1983 (additional source)
Asterionella A.H. Hassall, 1850 (additional source)
Asterionella bleakeleyi var. notata Grunow, 1867 (additional source)
Asterionella frauenfeldii Grunow, 1863 represented as Thalassionema frauenfeldii (Grunow) Tempère & Peragallo, 1910 (additional source)
Asterionella glacialis Castracane, 1886 (additional source)
Asterionella japonica Cleve, 1882 (additional source)
Asterionella kariana Grunow, 1880 (additional source)
Asterionellopsis F.E. Round in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (additional source)
Asterionellopsis glacialis (Castracane) Round, 1990 accepted as Asterionella glacialis Castracane, 1886 (additional source)
Asterionellopsis kariana (Grunow) Round, 1990 accepted as Asterionella kariana Grunow, 1880 (additional source)
Asteromonas gracilis Artari, 1913 (additional source)
Asteromphalus arachne (Brébisson) Ralfs, 1861 accepted as Spatangidium arachne Brébisson, 1857 (additional source)
Asteromphalus flabellatus (Brébisson) Greville, 1859 (additional source)
Asteromphalus heptactis (Brébisson) Ralfs, 1861 (additional source)
Asteromphalus hookeri Ehrenberg, 1844 (additional source)
Asteromphalus hyalinus Karsten, 1905 (additional source)
Attheya decora T.West, 1860 (additional source)
Attheya longicornis R.M.Crawford & C.Gardner, 1994 (additional source)
Attheya septentrionalis (Østrup) R.M.Crawford, 1994 accepted as Chaetoceros septentrionalis Cleve, 1896 (additional source)
Aulacodiscus argus (Ehrenberg) A.Schmidt, 1886 accepted as Tripodiscus argus Ehrenberg, 1839 (additional source)
Aureococcus anophagefferens Hargraves & Sieburth, 1988 (additional source)
Azpeitia nodulifera (A.W.F.Schmidt) G.A.Fryxell & P.A.Sims, 1986 (additional source)
Bacillaria J.F. Gmelin, 1788 (additional source)
Bacillaria paradoxa J.F.Gmelin, 1791 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (additional source)
Bacillaria paxillifer (O.F.Müller) T.Marsson, 1901 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (additional source)
Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (additional source)
Bacteriastrum delicatulum Cleve, 1897 (additional source)
Bacteriastrum elongatum Cleve, 1897 (additional source)
Bacteriastrum furcatum Shadbolt, 1854 (additional source)
Bacteriastrum hyalinum Lauder, 1864 (additional source)
Bacteriastrum varians Lauder, 1864 accepted as Bacteriastrum furcatum Shadbolt, 1854 (additional source)
Bacterosira bathyomphala (Cleve) Syvertsen & Hasle, 1993 accepted as Coscinodiscus bathyomphalus Cleve, 1883 (additional source)
Bacterosira fragilis (Gran) Gran, 1900 accepted as Lauderia fragilis Gran, 1897 (additional source)
Balaniger balticus H.A.Thomsen & K.Oates, 1978 (additional source)
Balechina coerulea (Dogiel) F.J.R.Taylor, 1976 accepted as Cucumeridinium coeruleum (Dogiel) F.Gomez, P.López-García, H.Takayama & D.Moreira, 2015 (additional source)
Bathycoccus prasinos Eikrem & Throndsen, 1990 (additional source)
Bellerochea horologicalis Stosch, 1980 (additional source)
Bellerochea malleus (Brightwell) Van Heurck, 1885 (additional source)
Bellerochea polymorpha Hargraves & Guillard, 1974 (additional source)
Bicosoeca gracilipes James-Clark, 1867 (additional source)
Bicosoeca maris Picken, 1941 (additional source)
Bicosoeca mediterranea Pavillard, 1916 (additional source)
Bicosoecaceae Haeckel, 1894 (basis of record)
Bicosoecales (basis of record)
Bicosta minor (N.Reynolds) Leadbeater, 1978 (additional source)
Bicosta spinifera (Throndsen) Leadbeater, 1978 (additional source)
Biddulphia aurita (Lyngbye) Brébisson, 1838 accepted as Odontella aurita (Lyngbye) C.Agardh, 1832 (basis of record)
Biddulphia litigiosa Van Heurck, 1909 (additional source)
Biddulphia longicruris Greville, 1859 accepted as Hobaniella longicruris (Greville) P.A. Sims & D.M. Williams in Sims et al., 2018 (additional source)
Biddulphia mobiliensis (J.W.Bailey) Grunow, 1882 accepted as Trieres mobiliensis (J.W.Bailey) Ashworth & E.C.Theriot in Ashworth, Nakov & E.C.Theiriot, 2013 (additional source)

 Identification

 for Symbolophora microtrias Ehrenberg, 1844

The authors (Hällfors, 2004; Tomas, 1997) are uncertain about the Genus [details]

 Spelling

 for Bacillaria paxillifer (O.F.Müller) T.Marsson, 1901

Spelled as Bacillaria paxillifera in Hällfors (2004) and Tomas (1997) [details]

 Spelling

 for Odontella mobilensis (J. W. Bailey) Grunow, 1884

Spelled as Odontella mobiliensis in Tomas (1997) [details]

 Spelling

 for Orthoseira marina W.Smith, 1856

Spelled as Orthosira marina in Hällfors (2004) and Tomas (1997) [details]

 Validity

 for Paralia marina (W.Smith) Heiberg, 1863

Tomas (1997) refers to this species as a valid one [details]