| WebNameShort | |
| Amphora cymbifera var. rara Frenguelli 1945 |
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| Amphora platensis Frenguelli 1945 |
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| Anomoeoneis polygramma var. platensis Frenguelli 1945 |
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| Anomoeoneis sphaerophora var. linearis Frenguelli 1945 |
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| Biddulphia antediluviana var. excavata Frenguelli 1945 |
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| Diploneis argentina (Frenguelli) Frenguelli 1945 |
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| Epithemia argus f. minor Frenguelli 1945 |
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| Epithemia denticula Frenguelli 1945 |
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| Fragilaria construens var. elliptica (Schumann) Frenguelli 1945 |
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| Hantzschia amphioxys var. capitata (Otto Müller) Frenguelli 1945 |
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| Mastogloia tumidula Frenguelli 1945 |
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| Muelleria linearis (Otto Müller) Frenguelli 1945 |
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| Muelleria patagonica (Otto Müller) Frenguelli 1945 |
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| Muelleria portomontana (porto-monttana) (Cleve) Frenguelli 1945 |
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| Navicula crucicula var. lanceolata Frenguelli 1945 |
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| Navicula dicephala var. constricta Frenguelli 1945 |
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| Navicula malacarae Frenguelli 1945 |
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| Navicula pleurostauroides Frenguelli 1945 |
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| Nitzschia ingens Frenguelli 1945 |
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| Nitzschia ingens f. curta Frenguelli 1945 |
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