| WebNameShort | |
| Biddulphia spinosa (J.W. Bailey) Boyer 1900 |
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| Biddulphia subrotundata (Schmidt in Schmidt et al.) Boyer 1900 |
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| Biddulphia tabellaria (Brightwell) Boyer 1900 |
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| Biddulphia tessellata (Greville) Boyer 1900 |
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| Biddulphia testudo (Brun in Brun & Tempère) Boyer 1900 |
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| Biddulphia thumii (Schmidt in Schmidt et al.) Boyer 1900 |
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| Biddulphia trisulca (J.W. Bailey ex Ralfs in Pritchard) Boyer 1900 |
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| Biddulphia vesiculosa (Agardh) Boyer 1900 |
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| Hemiaulus solenoceros (Ehrenberg) Boyer 1900 |
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| Triceratium arcticum f. pentagona [no author] according to Boyer 1900 |
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| Triceratium arcticum var. sexangulatum ‘J. A. Schulze’ Boyer 1900 |
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