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| Pleurosigma obscurum var. diminuta H. Peragallo 1891 |
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| Pleurosigma o'mearii (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma paradoxum H. Peragallo 1891 |
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| Pleurosigma peragalli (peragalloi) Brun in H. Peragallo 1891 |
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| Pleurosigma pusillum var. paradoxum H. Peragallo 1891 |
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| Pleurosigma pusillum var. salinarum (Grunow) H. Peragallo 1891 |
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| Pleurosigma rhombeum (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma rhombeum var. latum H. Peragallo 1891 |
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| Pleurosigma rigidum var. gruendleri (grundlerii) (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma rigidum var. incurvata Brun in H. Peragallo 1891 |
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| Pleurosigma sinense var. constrictum H. Peragallo 1891 |
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| Pleurosigma sinense var. reversum H. Peragallo 1891 |
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| Pleurosigma speciosum var. abruptum (abrupta) H. Peragallo 1891 |
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| Pleurosigma speciosum var. gracilis H. Peragallo 1891 |
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| Pleurosigma speciosum var. javanicum H. Peragallo 1891 |
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| Pleurosigma speciosum var. sumatricum (sumatrica) H. Peragallo 1891 |
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| Pleurosigma speciosum var. tahitense (Castracane) H. Peragallo 1891 |
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| Pleurosigma spectabile Grunow in H. Peragallo 1891 |
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| Pleurosigma spenceri (spencerii) var. febigeri (febigerii) (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma spenceri (spencerii) var. scalproides (Rabenhorst) H. Peragallo 1891 |
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