Acanthoceras azoricum (Menegh.) Kütz., 1862 accepted as Ceramium azoricum Meneghini accepted as Ceramium echionotum var. azoricum (Meneghini) Piccone, 1884
Acanthoceras echinophorum (Menegh.) Frauenf., 1855 accepted as Ceramium echionotum J.Agardh, 1844
Acanthoceras echionotum (J.Agardh) Kütz., 1849 accepted as Ceramium echionotum J.Agardh, 1844
Acanthoceras magdeburgense Honigm., 1910 accepted as Acanthoceras zachariasii (Brun) Simonsen, 1979
Acanthoceras magdeburgense var. lata Honigm., 1909 accepted as Acanthoceras zachariasii (Brun) Simonsen, 1979
Acanthoceras magdeburgense var. magdeburgense Honigmann, 1909 accepted as Acanthoceras magdeburgense Honigm., 1910 accepted as Acanthoceras zachariasii (Brun) Simonsen, 1979
Acanthoceras oxyacanthum Kützing, 1849 (uncertain )
Acanthoceras zachariasii (Brun) Simonsen, 1979
Bacteriastrum affine (Lauder) Tempère & Peragallo, 1889-1895 accepted as Chaetoceros affinis f. affinis Lauder, 1864
Bacteriastrum biconicum Pavillard, 1916 (uncertain > unassessed )
Bacteriastrum brevispinum Castracane, 1886 (uncertain > unassessed )
Bacteriastrum comosum J.Pavillard, 1916
Bacteriastrum comosum var. comosum Pavillard, 1916 (uncertain > unassessed )
Bacteriastrum comosum var. hispidum (Castracane) Ikari, 1972 (uncertain > unassessed )
Bacteriastrum criophilum Karsten, 1905 (uncertain > unassessed )
Bacteriastrum curvatum Shadbolt, 1854 (uncertain > unassessed )
Bacteriastrum delicatulum Cleve, 1897
Bacteriastrum delicatulum var. delicatulum Cleve, 1897 (uncertain > unassessed )
Bacteriastrum delicatulum var. princeps (Castracane) Pavillard, 1911 accepted as Bacteriastrum varians var. princeps Castracane, 1886
Bacteriastrum elegans J.Pavillard
Bacteriastrum elegans var. elegans Pavillard, 1916 (uncertain > unassessed )
Bacteriastrum elegans var. hispida (Castracane) Pavillard, 1924 accepted as Bacteriastrum wallichii var. hispida Castracane, 1886
Bacteriastrum elongatum Cleve, 1897
Bacteriastrum elongatum var. diversum Ikari, 1927 (uncertain > unassessed )
Bacteriastrum elongatum var. elongatum Cleve, 1897 (uncertain > unassessed )
Bacteriastrum furcatum Shadbolt, 1854 (uncertain > unassessed )
Bacteriastrum furcatum var. hispida (Castracane) Simonsen, 1974 accepted as Bacteriastrum wallichii var. hispida Castracane, 1886
Bacteriastrum halo Brun in Brun & Tempère, 1889 (uncertain > unassessed )
Bacteriastrum hebes ‘Mann' Mills, 1925 (uncertain > unassessed )
Bacteriastrum hyalinum Lauder, 1864
Bacteriastrum hyalinum var. hyalinum Lauder, 1864 (uncertain > unassessed )
Bacteriastrum hyalinum var. princeps (Castracane) Ikari, 1927 accepted as Bacteriastrum varians var. princeps Castracane, 1886
Bacteriastrum jadranum Godrijan, Maric & Pfannkuchen, 2012
Bacteriastrum mediterraneum J.Pavillard, 1916 (uncertain > unassessed )
Bacteriastrum medusa ‘Mann' Mills, 1925 (uncertain > unassessed )
Bacteriastrum minus Karsten, 1905 (uncertain > unassessed )
Bacteriastrum nodulosa Shadbolt, 1854 (uncertain > unassessed )
Bacteriastrum parallelum Sarno, Zingone & Marino, 1997 (uncertain > unassessed )
Bacteriastrum pennatum Grunow ex Cleve & Möller, 1888 (uncertain > unassessed )
Bacteriastrum pennatum var. halo Brun (uncertain > unassessed )
Bacteriastrum princeps ‘Mann' Mills, 1925 (uncertain > unassessed )
Bacteriastrum productum H.L. Smith, 1874 (uncertain > unassessed )
Bacteriastrum shadbolti Ehrenberg, 1854 (uncertain > unassessed )
Bacteriastrum sinensis Reyssac, 1968 (uncertain > unassessed )
Bacteriastrum solitarium Mangin, 1913 (uncertain > unassessed )
Bacteriastrum spirillum Castracane, 1886 (uncertain > unassessed )
Bacteriastrum symmetricum Leuduger-Fortmorel, 1892 (uncertain > unassessed )
Bacteriastrum tenue E.Steemann Nielsen, 1931 (uncertain > unassessed )
Bacteriastrum varians Hustedt, 1929 (uncertain > unassessed )
Bacteriastrum varians Lauder, 1864 accepted as Bacteriastrum furcatum Shadbolt, 1854
Bacteriastrum varians f. curvata (Shadbolt) M. Peragallo, 1897 accepted as Bacteriastrum curvatum Shadbolt, 1854
Bacteriastrum varians f. furcata (Shadbolt) M. Peragallo, 1897 accepted as Bacteriastrum furcatum Shadbolt, 1854
Bacteriastrum varians f. hyalina (H.S.Lauder) J.Frenguelli, 1928 accepted as Bacteriastrum hyalinum var. hyalinum Lauder, 1864
Bacteriastrum varians f. varians Lauder, 1864 (uncertain > unassessed )
Bacteriastrum varians var. borealis Ostenfeld, 1901 (uncertain > unassessed )
Bacteriastrum varians var. hispidum (Castracane) Schröder, 1906 (uncertain > unassessed )
Bacteriastrum varians var. hyalina (Lauder) Peragallo & Peragallo, 1897-1908 accepted as Bacteriastrum hyalinum var. hyalinum Lauder, 1864
Bacteriastrum varians var. princeps Castracane, 1886 (uncertain > unassessed )
Bacteriastrum wallichii J.Ralfs
Bacteriastrum wallichii var. hispida Castracane, 1886 (uncertain > unassessed )
Bacteriastrum wallichii var. wallichii Ralfs in Pritchard, 1861 (uncertain > unassessed )
Chaetoceros (Phaeoceros) dadayi Pavillard, 1913 accepted as Chaetoceros dadayi Pavillard, 1913
Chaetoceros abnormis Proschkina-Lavrenko, 1953 (uncertain > unassessed )
Chaetoceros acadianus Samanta & Porcher in Kaczmarska et al., 2019
Chaetoceros aculeatus Makarova, 1962 (uncertain > unassessed )
Chaetoceros adelianium E. Manguin, 1960 (uncertain > unassessed )
Chaetoceros adelianum E. Manguin, 1957 (uncertain > unassessed )
Chaetoceros adhaerens Mangin, 1913 accepted as Chaetoceros costatus Pavillard, 1911
Chaetoceros adhaereus L. Mangin, 1913 (uncertain > unassessed )
Chaetoceros adriaticus B.Schussnig, 1915 (uncertain > unassessed )
Chaetoceros aduncus Suchanova, 1971 (uncertain > unassessed )
Chaetoceros aequatorialis Cleve, 1873 (uncertain > unassessed )
Chaetoceros aequatorialis Yendo, 1905 (uncertain > unassessed )
Chaetoceros aequatorialis f. antarctica E. Manguin, 1960 (uncertain > unassessed )
Chaetoceros aequatorialis f. paralleliseta E. Manguin, 1960 (uncertain > unassessed )
Chaetoceros aequatorialis var. antarctica
Chaetoceros affine Lauder, 1864 accepted as Chaetoceros affinis Lauder, 1864
Chaetoceros affine f. inaequale Thorr.-Sm., 1969 (uncertain > unassessed )
Chaetoceros affine f. parallelum Thorr.-Sm., 1970 (uncertain > unassessed )
Chaetoceros affine f. pseudosymmetricum (Steeman-Nielsen) Thorr.-Sm, 1970 accepted as Chaetoceros pseudosymmetricus Nielsen, 1931
Chaetoceros affinis Lauder, 1864
Chaetoceros affinis f. affinis Lauder, 1864 (uncertain > unassessed )
Chaetoceros affinis f. clevei (Schutt) F.W. Mills, 1933 accepted as Chaetoceros clevei Schütt, 1895
Chaetoceros affinis f. femur (Schütt) Taylor, 1967 accepted as Chaetoceros femur Schütt, 1895
Chaetoceros affinis f. schuettii (Cleve) Proschkina-Lavrenko, 1955 accepted as Chaetoceros schuettii var. schuettii Cleve, 1894
Chaetoceros affinis f. singularis (uncertain > unassessed )
Chaetoceros affinis f. singularis extremis Takano, 1960 (uncertain > unassessed )
Chaetoceros affinis f. singularis ferox Takano, 1960 (uncertain > unassessed )
Chaetoceros affinis f. singularis singularis Takanol, 1960 (uncertain > unassessed )
Chaetoceros affinis var. affinis Kokubo, 1955 (uncertain > unassessed )
Chaetoceros affinis var. circinalis (Meunier) Hustedt, 1930 accepted as Chaetoceros schuettii var. circinalis Meunier, 1913
Chaetoceros affinis var. intermedius Subrahmanyan, 1946 (uncertain > unassessed )
Chaetoceros affinis var. schuettii (Cleve) Ivanov, 1959 accepted as Chaetoceros schuettii var. schuettii Cleve, 1894
Chaetoceros affinis var. willei (Gran) Hustedt, 1930 accepted as Chaetoceros willei Gran, 1897
Chaetoceros amanita Cleve-Euler, 1915 (uncertain > unassessed )
Chaetoceros ambiguus A.P. Jousé, 1978 (uncertain > unassessed )
Chaetoceros anastomosans Gran, 1905 (uncertain > unassessed )
Chaetoceros anastomosans Grunow, 1882
Chaetoceros anastomosans var. anastomosans Grunow in Van Heurck, 1882 (uncertain > unassessed )
Chaetoceros anastomosans var. externus (Gran) Cleve-Euler, 1951 accepted as Chaetoceros externus Gran, 1897