Achnanthes araucaniana Freng., 1934 † (original description)
Amphora araucaniana Frenguelli, 1934 † (original description)
Amphora frenguellii Forti in Frenguelli, 1934 (original description)
Amphora minuscula Frenguelli, 1934 † (original description)
Amphora sculpta Frenguelli, 1934 † (original description)
Amphora subrobusta var. pliocenica Frenguelli, 1934 † (original description)
Anomoeoneis rostrata (Otto Müller) Frenguelli, 1934 accepted as Anomoeoneis sphaerophora f. rostrata Otto Müller, 1899 (new combination reference)
Anomoeoneis sphaerophora var. angusta Frenguelli, 1934 † (original description)
Caloneis mendosina Frenguelli, 1934 (basis of record)
Caloneis mendosina var. mendosina Frenguelli, 1934 (original description)
Caloneis mendosina var. minor Frenguelli, 1934 † accepted as Caloneis mendosina Frenguelli, 1934 (original description)
Denticula elegans var. pliocenica Frenguelli, 1934 † (original description)
Diploneis hannai Frenguelli, 1934 † (original description)
Gomphonema candelariae var. lanceolata Frenguelli, 1934 † (original description)
Gomphonema gallaudi var. araucaniana Frenguelli, 1934 † (original description)
Grunowia denticula var. pliocenica Frenguelli, 1934 (original description)
Hantzschia araucaniana Frenguelli, 1934 † (original description)
Melosira patagonica (Otto Müller) Cleve-Euler accepted as Melosira lineolata var. patagonica Otto Müller, 1909 (new combination reference)
Navicula araucaniana Frenguelli, 1934 † (original description)
Navicula guayqueriae Frenguelli, 1934 (original description)
Navicula mendosina Frenguelli, 1934 † (original description)
Nitzschia obtusa var. sodalis Frenguelli, 1934 (original description)
Rhopalodia gibberula var. timsahensis (Otto Müller) Frenguelli, 1955 accepted as Rhopalodia musculus var. timsahensis Otto Müller, 1900 (new combination reference)
Stauroneis hickeni Frenguelli, 1934 † (original description)
Vanheurckia suspecta Frenguelli † accepted as Frustulia suspecta (Frenguelli) Woodhead & Tweed (original description)
Vanheurckia suspecta var. suspecta Frenguelli, 1934 (original description)