Bacteriastrum varians Hustedt, 1929 (original description)
Bellerochea malleus f. biangulata Peragallo accepted as
Bellerochea malleus var. biangulata H.Peragallo & M.Peragallo, 1908 (new combination reference)
Bellerochea malleus f. tetragona (Van Heurck) Hustedt, 1930 accepted as
Triceratium malleus var. tetragona Grunow in Van Heurck, 1883 (new combination reference)
Biddulphia aurita var. obtusa (Kützing) Hustedt, 1930 accepted as
Odontella obtusa Kützing, 1844 (new combination reference)
Biddulphia laevis var. schmidtii (Forti) Hustedt, 1930 accepted as
Cerataulus laevis f. schmidtii Forti, 1910 (new combination reference)
Biddulphia minima Schiller in Hustedt, 1930 (original description)
Biddulphia rhombus f. tetragona Hustedt, 1927 accepted as
Biddulphia rhombus var. tetragona A.Schmidt, 1874 (new combination reference)
Biddulphia rhombus f. trigona Hustedt, 1927 accepted as
Biddulphia rhombus var. trigona Cleve ex Van Heurck, 1882 (new combination reference)
Chaetoceros affinis var. circinalis (Meunier) Hustedt, 1930 accepted as
Chaetoceros schuettii var. circinalis Meunier, 1913 (new combination reference)
Chaetoceros affinis var. willei (Gran) Hustedt, 1930 accepted as
Chaetoceros willei Gran, 1897 (new combination reference)
Chaetoceros atlanticus var. neapolitana (Schroder) Hustedt, 1930 accepted as
Chaetoceros neapolitanus Schröder, 1900 (new combination reference)
Chaetoceros atlanticus var. skeleton (Schutt) Hustedt, 1930 accepted as
Chaetoceros skeleton F.Schütt, 1895 (new combination reference)
Chaetoceros concavicornis f. volans (Schutt) Hustedt, 1930 accepted as
Chaetoceros volans Schütt, 1895 (new combination reference)
Chaetoceros orientalis Schiller in Hustedt, 1930 (original description)
Chaetoceros peruvianum f. gracilis (Schroder) Hustedt, 1930 (new combination reference)
Chaetoceros subsecundus (Grunow ex Van Heurck) Hustedt, 1927 accepted as
Chaetoceros distans var. subsecunda Grunow in Van Heurck, 1883 (new combination reference)
Chaetoceros vixvisibilis Schiller in Hustedt, 1930 (original description)
Ditylum brightwellii f. biangulata Hustedt, 1930 (original description)
Ditylum brightwellii f. tetragona (Grunow in Van Heurck) Hustedt, 1930 accepted as
Ditylum brightwellii var. tetragona Grunow in Van Heurck, 1883 (new combination reference)
Eunotiopsis monilifera (Petit) Hustedt, 1930 accepted as
Epithemia monilifera Petit, 1877 (new combination reference)
Hemidiscus cuneiformis var. gibba (J.W. Bailey MS., Ralfs in Pritchard) Hustedt, 1930 accepted as
Euodia gibba var. gibba J.W. Bailey, Ralfs in Pritchard, 1861 (new combination reference)
Hemidiscus cuneiformis var. orbicularis (Castracane) Hustedt, 1930 accepted as
Euodia orbicularis Castracane, 1886 (new combination reference)
Hemidiscus cuneiformis var. recta (Castracane) Hustedt, 1930 accepted as
Euodia recta Castracane, 1886 (new combination reference)
Hemidiscus cuneiformis var. ventricosa (Castracane) Hustedt, 1930 accepted as
Euodia ventricosa Castracane, 1886 (new combination reference)
Odontotropis danicus Debes ex Hustedt, 1930 (original description)
Odontotropis klavsenii Debes ex Hustedt, 1930 (original description)
Terpsinoë musica var. intermedia (Grunow) Hustedt, 1930 accepted as
Terpsinoë intermedia f. intermedia Grunow, 1884 (new combination reference)
Triceratium antediluvianum f. pentagona Hustedt, 1930 (original description)
Triceratium arcticum f. balaeana (Ehrenberg; Ehrenberg) Hustedt, 1930 accepted as
Zygoceros balaena Ehrenberg, 1853 (new combination reference)
Triceratium balearicum f. biquadrata (Janisch in Schmidt et al.) Hustedt, 1930 accepted as
Triceratium biquadratum Janisch, 1886 (new combination reference)
Triceratium balearicum f. quadrata Hustedt, 1930 (original description)
Triceratium favus f. quadrata (Grunow) Hustedt, 1930 accepted as
Triceratium favus var. quadrata Grunow, 1885 (new combination reference)
Triceratium formosum f. quadrangularis (Greville) Hustedt, 1930 accepted as
Triceratium quadrangulare Greville, 1865 (new combination reference)
Triceratium formosum f. quinquelobata (Greville) Hustedt, 1930 accepted as
Triceratium quinquelobatum Greville, 1866 (new combination reference)
Triceratium ischaboense Hustedt, 1930 (original description)
Triceratium pentacrinus f. quadrata Hustedt, 1930 (original description)
Triceratium reticulum f. pentagona Hustedt, 1930 (original description)
Triceratium reticulum f. quadrangularis Hustedt, 1930 (original description)
Triceratium robertsianum f. quadrata Hustedt, 1930 (original description)
Triceratium shadboltianum var. elongata (Grunow) Hustedt, 1930 accepted as
Triceratium elongatum Grunow, 1867 (new combination reference)
Triceratium spinosum f. tetragona Hustedt, 1930 (original description)
Trinacria exsculpta var. exsculpta (Heiberg) Hustedt, 1930 (new combination reference)