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| Navicula smithii (Agardh) Van Heurck 1896 |
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| Navicula smithii var. aestiva (Donkin) Van Heurck 1896 |
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| Navicula smithii var. scutellum (O'Meara) Van Heurck 1896 |
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| Navicula splendida var. puella (Schmidt in Schmidt et al.) Van Heurck 1896 |
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| Navicula suborbicularis var. coffeaeformis (Schmidt) Van Heurck 1896 |
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| Navicula ulvacea (ulvoides) (Berkeley in litt., Kutzing) Van Heurck 1896 |
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| Nitzschia filiformis (W. Smith) Van Heurck 1896 |
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| Nitzschia martiana (Agardh; Agardh) Van Heurck 1896 |
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| Nitzschia paradoxa var. major Van Heurck 1896 |
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| Nitzschia subcohaerens (Grunow) Van Heurck 1896 |
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| Nitzschia subcohaerens var. scotica (Grunow in Van Heurck) Van Heurck 1896 |
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| Omphalopelta undulata Van Heurck 1896 |
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| Orthotropis lepidoptera (Gregory) Van Heurck 1896 |
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| Orthotropis lepidoptera var. pusilla (Gregory) Van Heurck 1896 |
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| Orthotropis maxima (Gregory) Van Heurck 1896 |
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| Perithyra denaria Ehrenberg ex Van Heurck 1896 |
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| Perithyra quaternaria Ehrenberg ex Van Heurck 1896 |
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| Pleurosigma angulatum var. major (Grunow in Van Heurck) Van Heurck 1896 |
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| Pleurosigma attenuatum var. scalprum (Gaillon in Turpin) Van Heurck 1896 |
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| Pleurosigma intermedium var. nubecula (W. Smith) Van Heurck 1896 |
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