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| Donkinia recta var. angusta (Donkin) H. Peragallo 1891 |
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| Donkinia recta var. intermedia H. Peragallo 1891 |
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| Donkinia recta var. thumii (Cleve in H. Peragallo) Peragallo & Peragallo 1891 |
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| Donkinia thumii H. Peragallo 1891 |
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| Gyrosigma spenceri (spencerii) var. scalproides (Rabenhorst) H. Peragallo 1891 |
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| Pleurosigma abruptum H. Peragallo 1891 |
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| Pleurosigma acutum var. japonicum H. Peragallo 1891 |
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| Pleurosigma acutum var. pelagicum H. Peragallo manus. ex H. Peragallo 1891 |
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| Pleurosigma aestuarii (aestuarium) var. candida (Schumann) H. Peragallo 1891 |
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| Pleurosigma affine var. interruptum H. Peragallo 1891 |
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| Pleurosigma affine var. normanni (Ralfs in Pritchard) H. Peragallo 1891 |
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| Pleurosigma angulatum var. finmarchica (Cleve in Cleve & Moller; Cleve ex Grunow) H. Peragallo 1891 |
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| Pleurosigma antillarum H. Peragallo 1891 |
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| Pleurosigma asiaticum (Tempère & Brun in Brun & Tempère) H. Peragallo 1891 |
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| Pleurosigma attenuatum var. hippocampus (Ehrenberg; W. Smith) H. Peragallo 1891 |
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| Pleurosigma balticum var. longissimum (Cleve) H. Peragallo 1891 |
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| Pleurosigma balticum var. lorenzii (Grunow) H. Peragallo 1891 |
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| Pleurosigma balticum var. maxima H. Peragallo 1891 |
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| Pleurosigma balticum var. obliquum (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma balticum var. plagiostoma (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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