| WebNameShort | |
| Hemidiscus cuneiformis var. gibba (J.W. Bailey MS., Ralfs in Pritchard) Hustedt 1930 |
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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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| Odontotropis danicus Debes ex Hustedt 1930 |
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| Odontotropis klavsenii Debes ex Hustedt 1930 |
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| Terpsinoe musica var. intermedia (Grunow) Hustedt 1930 |
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| Triceratium antediluvianum f. pentagona Hustedt 1930 |
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| Triceratium arcticum f. balaeana (Ehrenberg; Ehrenberg) Hustedt 1930 |
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| Triceratium balearicum f. biquadrata (biquadratum) (Janisch in Schmidt et al.) Hustedt 1930 |
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| Triceratium balearicum f. quadrata Hustedt 1930 |
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| Triceratium favus f. quadrata (quadratum) (Grunow in Schmidt et al.) 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 ischaboense Hustedt 1930 |
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| Triceratium pentacrinus f. quadrata Hustedt 1930 |
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| Triceratium reticulum f. pentagona Hustedt 1930 |
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| Triceratium reticulum f. quadrangularis Hustedt 1930 |
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| Triceratium robertsianum f. quadrata Hustedt 1930 |
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| Triceratium shadboltianum var. elongata (Grunow) Hustedt 1930 |
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