• Bacteria
• Bacteria incertae sedis (temporary name)
• Bacteriastrum G. Shadbolt, 1854
• 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)