| WebNameShort | |
| Actinocyclus barkleyi f. minor Frenguelli 1928 |
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| Actinoptychus vulgaris f. octonaria (Ehrenberg) Frenguelli 1928 |
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| Actinoptychus vulgaris f. polymera Frenguelli 1928 |
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| Actinoptychus vulgaris f. senaria Frenguelli 1928 |
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| Bacteriastrum varians f. hyalina (Lauder) Frenguelli 1928 |
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| Coscinodiscus gigas var. janischii (Schmidt in Schmidt et al.) Frenguelli 1928 |
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| Coscinodiscus lineatus f. minor Frenguelli 1928 |
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| Coscinodiscus radiatus var. moronensis (Grunow) Frenguelli 1928 |
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| Coscinodiscus symbolophoroides Frenguelli 1928 |
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| Coscinodiscus variabilis Frenguelli 1928 |
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| Cosmiodiscus variabilis Frenguelli 1928 |
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| Cymatosira atlantica Frenguelli 1928 |
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| Hemiaulus marplatensis Frenguelli 1928 |
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| Navicula directa var. planctonica Frenguelli 1928 |
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| Nitzschia coarctata var. oceanica Frenguelli 1928 |
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| Pleurosigma atlanticum Frenguelli 1928 |
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| Rhaphoneis (Raphoneis) surirella var. grunovii (grunowii) Frenguelli 1928 |
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| Stephanopyxis turris f. minor (Grunow) Frenguelli 1928 |
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| Stephanopyxis turris f. subconstricta (Grunow in Van Heurck; Grunow) Frenguelli 1928 |
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