| 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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| Opephoropsis schwartzii (swartzii) (Grunow) Frenguelli 1945 |
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| Pinnularia aperta var. undulata (Frenguelli) Frenguelli 1945 |
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| Rhopalodia gibberula var. gravida Frenguelli 1945 |
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| Rhopalodia gibberula var. timsahensis (Otto Müller) Frenguelli 1945 |
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| Surirella tuberosa var. major Frenguelli 1945 |
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| Synedra platensis var. obtusa Frenguelli 1945 |
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| Tryblionella hantzschiana (hantzschia) var. debilis Frenguelli 1945 |
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| Tryblionella marginulata (Grunow) Frenguelli 1945 |
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| Tryblionella punctata f. paucistriata Frenguelli 1945 |
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| Tryblionella punctata var. protracta Frenguelli 1945 |
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