Amphiprora lata var. sinuosa Frenguelli, 1938 (original description)
Amphora capitellata Frenguelli, 1938 (original description)
Biddulphia roperiana var. obtusa (Kützing) Frenguelli, 1938 accepted as
Odontella obtusa Kützing, 1844 (new combination reference)
Donkinia recta var. rostrata Frenguelli, 1938 (original description)
Glyphodesmis costatum (Peragallo & Peragallo) Frenguelli, 1938 accepted as
Dimeregramma costatum Peragallo & Peragallo, 1901 (new combination reference)
Gyrosigma neglectum Frenguelli, 1938 (original description)
Gyrosigma sulcatum (Grunow in Cleve & Grunow) Frenguelli, 1938 accepted as
Pleurosigma fasciolum var. sulcatum Grunow in Cleve & Grunow, 1880 (new combination reference)
Mastogloia pumila var. tetramera Frenguelli, 1938 (original description)
Navicula blasii Frenguelli, 1938 (original description)
Navicula pennata f. maxima (Cleve) Frenguelli, 1938 (new combination reference)
Nitzschia fina Frenguelli, 1938 (original description)
Nitzschia minuscula Frenguelli, 1938 (original description)
Opephora perminuta (Grunow) Frenguelli, 1938 accepted as
Sceptroneis marina var. perminuta Grunow, 1881 (new combination reference)
Plagiogramma interruptum var. tenuistriata (Cleve) Frenguelli, 1938 accepted as
Plagiogramma tenuistriatum Cleve, 1883 (new combination reference)
Pleurosigma lanceolatum f. undulata Frenguelli, 1938 (original description)
Vanheurckia blasii Frenguelli, 1938 (original description)
Buenos Aires for
Amphiprora lata var. sinuosa Frenguelli, 1938
Buenos Aires for
Amphora capitellata Frenguelli, 1938
Buenos Aires for
Mastogloia pumila var. tetramera Frenguelli, 1938
Buenos Aires for
Nitzschia minuscula Frenguelli, 1938
South Atlantic for
Donkinia recta var. rostrata Frenguelli, 1938
South Atlantic for
Gyrosigma neglectum Frenguelli, 1938
South Atlantic for
Navicula blasii Frenguelli, 1938
South Atlantic for
Nitzschia fina Frenguelli, 1938
South Atlantic for
Pleurosigma lanceolatum f. undulata Frenguelli, 1938
South Atlantic for
Vanheurckia blasii Frenguelli, 1938