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| Pleurosigma delicatulum var. elegantissimum (Castracane) H. Peragallo 1891 |
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| Pleurosigma speciosum var. tahitense (Castracane) H. Peragallo 1891 |
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| Rhoicosigma thaitiense (tahitense) (Castracane) H. Peragallo 1891 |
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| Pleurosigma naviculaceum var. hungaricum (Cleve & Brun in Brun & Tempère) H. Peragallo 1891 |
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| Pleurosigma formosum var. balearica (balearicum) (Cleve & Grunow in Cleve & Moller) H. Peragallo 1891 |
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| Pleurosigma balticum var. thumii (Cleve ex H. Peragallo) H. Peragallo 1891 |
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| Pleurosigma stuxbergii var. rhomboides (Cleve in Cleve & Grunow) 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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| Donkinia recta var. thumii (Cleve in H. Peragallo) Peragallo & Peragallo 1891 |
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| Pleurosigma balticum var. longissimum (Cleve) H. Peragallo 1891 |
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| Pleurosigma cuspidatum (Cleve) H. Peragallo 1891 |
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| Donkinia recta var. angusta (Donkin) H. Peragallo 1891 |
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| Pleurosigma balticum var. wansbeckii (Donkin) H. Peragallo 1891 |
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| Pleurosigma fasciolum (fasciola) var. arcuatum (arcuata) (Donkin) H. Peragallo 1891 |
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| Pleurosigma tenuissimum var. lamprocampum (Ehrenberg) H. Peragallo 1891 |
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| Pleurosigma attenuatum var. hippocampus (Ehrenberg; W. Smith) 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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| Pleurosigma convexum (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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| Pleurosigma delicatulum var. clevei (Grunow in Cleve & Grunow) H. Peragallo 1891 |
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