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| Biddulphia arctica var. kerguelensis (Grunow in Cleve & Grunow) Boyer 1900 |
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| Biddulphia arctica var. californica (Grunow in Schmidt et al.) Boyer 1900 |
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| Biddulphia convexiuscula (Grunow in Schmidt et al.) Boyer 1900 |
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| Biddulphia costulata (Grunow in Schmidt et al.) Boyer 1900 |
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| Biddulphia interpunctata (Grunow in Schmidt et al.) Boyer 1900 |
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| Biddulphia inelegans var. jucatensis (Grunow in Schmidt) Boyer 1900 |
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| Anaulus laevis (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia arctica var. campeachiana (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia consimilis (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia hebetata (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia heteropora (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia inelegans var. araeopora (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia inelegans var. micropora (Grunow in Van Heurck) Boyer 1900 |
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| Biddulphia campeachiana (Grunow) Boyer 1900 |
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| Biddulphia quadricornis (Grunow) Boyer 1900 |
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| Biddulphia biddulphiana (J.E. Smith) Boyer 1900 |
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| Biddulphia trisulca (J.W. Bailey ex Ralfs in Pritchard) Boyer 1900 |
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| Biddulphia spinosa (J.W. Bailey) Boyer 1900 |
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| Biddulphia parvula (Janisch & Rabenhorst) Boyer 1900 |
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| Biddulphia biquadrata (Janisch in Schmidt et al.) Boyer 1900 |
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