Amphora cymbifera var. rara Frenguelli, 1945 † (original description)
Amphora platensis Frenguelli, 1945 (original description)
Anomoeoneis polygramma var. platensis Frenguelli, 1945 accepted as
Anomoeoneis costata (Kützing) Hustedt, 1959 accepted as
Navicula costata var. costata Kützing, 1844 (original description)
Anomoeoneis sphaerophora var. linearis Frenguelli, 1945 (original description)
Biddulphia antediluviana var. excavata Frenguelli, 1945 (original description)
Diploneis argentina (Frenguelli) Frenguelli, 1945 (new combination reference)
Epithemia argus f. minor Frenguelli, 1945 (original description)
Epithemia denticula Frenguelli, 1945 (original description)
Fragilaria construens var. elliptica (Schumann) Frenguelli, 1945 accepted as
Fragilaria elliptica f. elliptica Schumann, 1867 (new combination reference)
Hantzschia amphioxys var. capitata O.F.Müller (new combination reference)
Mastogloia tumidula Frenguelli, 1945 (original description)
Muelleria (J. Frenguelli) J. Frenguelli, 1945 (original description)
Muelleria linearis (Otto Müller) Frenguelli, 1945 (new combination reference)
Muelleria patagonica (O.Müller) Frenguelli, 1945 (new combination reference)
Muelleria portomontana (Cleve) Frenguelli, 1945 accepted as
Navicula portomontana var. portomontana Cleve, 1894 (new combination reference)
Navicula crucicula var. lanceolata Frenguelli, 1945 (original description)
Navicula dicephala var. constricta Frenguelli, 1945 accepted as
Navicula dicephala var. sannicoensis Guerrero & Vouilloud, 2021 (original description)
Navicula malacarae Frenguelli, 1945 (original description)
Navicula pleurostauroides Frenguelli, 1945 (original description)
Nitzschia ingens Frenguelli, 1945 (original description)
Nitzschia ingens f. curta Frenguelli, 1945 (original description)
Nitzschia ingens f. ingens Frenguelli, 1945 (original description)
Opephoropsis J. Frenguelli, 1945 (original description)
Opephoropsis schwartzii (Grunow) Frenguelli, 1945 accepted as
Fragilaria schwartzii Grunow, 1863 (new combination reference)
Pinnularia aperta var. undulata (Frenguelli) Frenguelli, 1945 accepted as
Navicula doeringii var. undulata Frenguelli, 1926 (new combination reference)
Pinnularia delicatula Frenguelli, 1945 accepted as
Pinnularia delicata Frenguelli, 1942 (basis of record)
Rhopalodia gibberula var. gravida Frenguelli, 1945 (original description)
Rhopalodia gibberula var. timsahensis (Otto Müller) Frenguelli, 1955 accepted as
Rhopalodia musculus var. timsahensis Otto Müller, 1900 (new combination reference)
Surirella tuberosa var. major Frenguelli, 1945 (original description)
Synedra platensis var. obtusa Frenguelli, 1945 † accepted as
Tabularia platensis var. obusa (Frenguelli) Sar & Sala, 2009 † (original description)
Tryblionella hantzschiana var. debilis Frenguelli, 1945 (original description)
Tryblionella marginulata (Grunow) D.G.Mann, 1990 accepted as
Nitzschia marginulata f. marginulata Grunow in Cleve & Möller, 1878 (new combination reference)
Tryblionella punctata f. paucistriata Frenguelli, 1945 (original description)
Tryblionella punctata var. protracta Frenguelli, 1945 (original description)
Buenos Aires for
Amphora cymbifera var. rara Frenguelli, 1945 †
Buenos Aires for
Amphora cymbifera var. rara Frenguelli, 1945 †
Buenos Aires for
Amphora cymbifera var. rara Frenguelli, 1945 †
Buenos Aires for
Amphora cymbifera var. rara Frenguelli, 1945 †
Buenos Aires for
Amphora platensis Frenguelli, 1945
Buenos Aires for
Amphora platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis polygramma var. platensis Frenguelli, 1945
Buenos Aires for
Anomoeoneis sphaerophora var. linearis Frenguelli, 1945
Buenos Aires for
Epithemia denticula Frenguelli, 1945
Buenos Aires for
Navicula crucicula var. lanceolata Frenguelli, 1945
Buenos Aires for
Navicula crucicula var. lanceolata Frenguelli, 1945
Buenos Aires for
Navicula crucicula var. lanceolata Frenguelli, 1945
Buenos Aires for
Navicula crucicula var. lanceolata Frenguelli, 1945
Buenos Aires for
Navicula malacarae Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Nitzschia ingens Frenguelli, 1945
Buenos Aires for
Rhopalodia gibberula var. gravida Frenguelli, 1945
Buenos Aires for
Rhopalodia gibberula var. gravida Frenguelli, 1945
Buenos Aires for
Surirella tuberosa var. major Frenguelli, 1945
Buenos Aires for
Synedra platensis var. obtusa Frenguelli, 1945 †
Buenos Aires for
Tryblionella punctata var. protracta Frenguelli, 1945
Buenos Aires for
Tryblionella punctata var. protracta Frenguelli, 1945
Entre Ríos for
Navicula crucicula var. lanceolata Frenguelli, 1945
Entre Ríos for
Navicula pleurostauroides Frenguelli, 1945
Formosa for
Eunotia major var. gigantea Frenguelli, 1933
Neuquén for
Navicula dicephala var. constricta Frenguelli, 1945
San Luis for
Nitzschia ingens Frenguelli, 1945
Santa Fé for
Mastogloia tumidula Frenguelli, 1945
Santa Fé for
Synedra platensis var. obtusa Frenguelli, 1945 †