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| Hemidiscus cuneiformis var. orbicularis (Castracane) Hustedt 1930 |
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| Hemidiscus cuneiformis var. recta (Castracane) Hustedt 1930 |
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| Hemidiscus cuneiformis var. ventricosa (Castracane) Hustedt 1930 |
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| Biddulphia rhombus f. trigona (Cleve in Van Heurck) Hustedt 1930 |
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| Triceratium arcticum f. balaeana (Ehrenberg; Ehrenberg) Hustedt 1930 |
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| Biddulphia laevis var. schmidti (Forti) Hustedt 1930 |
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| Chaetoceros affinis var. willei (Gran) Hustedt 1930 |
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| Triceratium formosum f. quadrangularis (Greville) Hustedt 1930 |
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| Triceratium formosum f. quinquelobata (Greville) Hustedt 1930 |
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| Triceratium favus f. quadrata (quadratum) (Grunow in Schmidt et al.) Hustedt 1930 |
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| Chaetoceros subsecundus (subsecundum) (Grunow in Van Heurck) Hustedt 1930 |
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| Ditylum brightwellii f. tetragona (Grunow in Van Heurck) Hustedt 1930 |
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| Terpsinoe musica var. intermedia (Grunow) Hustedt 1930 |
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| Triceratium shadboltianum var. elongata (Grunow) Hustedt 1930 |
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| Bellerochea malleus f. biangulata (H. Peragallo & M. Peragallo) Hustedt 1930 |
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| Trinacria exsculpta (exculpta) (Heiberg) Hustedt 1930 |
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| Hemidiscus cuneiformis var. gibba (J.W. Bailey MS., Ralfs in Pritchard) Hustedt 1930 |
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| Triceratium balearicum f. biquadrata (biquadratum) (Janisch in Schmidt et al.) Hustedt 1930 |
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| Biddulphia aurita var. obtusa (Kützing) Hustedt 1930 |
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| Chaetoceros affinis var. circinalis (Meunier) Hustedt 1930 |
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