| WebNameShort | |
| Biddulphia heilpriniana (Kain & E.A. Schultze) Boyer 1900 |
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| Biddulphia americana (Ralfs in Pritchard) Boyer 1900 |
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| Biddulphia ovalis (Schmidt in Schmidt et al.) Boyer 1900 |
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| Biddulphia subrotundata (Schmidt in Schmidt et al.) Boyer 1900 |
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| Biddulphia thumii (Schmidt in Schmidt et al.) Boyer 1900 |
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| Biddulphia californica (Schmidt) Boyer 1900 |
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| Biddulphia orbiculata (Shadbolt) 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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| Biddulphia arctica var. pentagona Boyer 1900 |
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| Biddulphia arctica var. sexangulata Boyer 1900 |
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