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| Achnanthepyla arctica var. incurvata (Østrup) M. Peragallo 1921 |
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| Biddulphia ottomuelleri var. cruciata (Petit) M. Peragallo 1921 |
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| Cocconeis imperatrix var. kerguelensis (Petit) M. Peragallo 1921 |
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| Melosira sol var. hungarica (Schmidt in Schmidt et al.) M. Peragallo 1921 |
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| Amphora lanceolata var. angustissima (Van Heurck) M. Peragallo 1921 |
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| Charcotia ornatus (Van Heurck) M. Peragallo 1921 |
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| Cocconeis schuetii var. litigiosa (Van Heurck) M. Peragallo 1921 |
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| Achnanthes subsenilis var. incurvata ‘Østrup’ M. Peragallo 1921 |
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| Achnanthepyla baccata M. Peragallo 1921 |
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| Achnanthepyla bongrainii M. Peragallo 1921 |
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| Achnanthepyla bongrainii var. parallela M. Peragallo 1921 |
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| Achnanthepyla gainii M. Peragallo 1921 |
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| Achnanthepyla gainii var. ostrupii M. Peragallo 1921 |
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| Achnanthepyla simplex M. Peragallo 1921 |
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| Achnanthes antarctica M. Peragallo 1921 |
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| Achnanthes charcotii M. Peragallo 1921 |
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| Achnanthes coarctata f. antarctica M. Peragallo 1921 |
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| Achnanthes coarctata var. distorta M. Peragallo 1921 |
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| Achnanthes distorta M. Peragallo 1921 |
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| Achnanthes muscorum M. Peragallo 1921 |
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