Chaetoceros scriptus Frenguelli, 1949 (original description)
Chaetoceros surirella Frenguelli, 1949 (original description)
Chaetoceros tiltilensis Frenguelli, 1949 (original description)
Cocconeis dirupta var. chilensis Frenguelli, 1949 (original description)
Cocconeis dirupta var. triumphis (Hanna & Grant) Frenguelli, 1949 accepted as Cocconeis triumphis Hanna & Grant, 1926 (new combination reference)
Detonia J. Frenguelli, 1949 accepted as Neodetonia S. Blanco, 2011 (original description)
Dimeregramma maculatum (Cleve) Frenguelli, 1949 (new combination reference)
Dimeregramma tiltilense Frenguelli, 1949 (original description)
Dimeregramma tiltilense var. biconstricta Frenguelli, 1949 (original description)
Diploneis adonis var. tiltilensis Frenguelli, 1949 (original description)
Grammatophora mejillonis Frenguelli, 1949 (original description)
Grammatophora tiltilensis Frenguelli, 1949 (original description)
Hemidiscus rotundus f. simplicissima (Hanna & Grant) Frenguelli, 1949 accepted as Hemidiscus simplicissimus Hanna & Grant, 1926 (new combination reference)
Nitzschia baculum Frenguelli, 1949 † (original description)
Nitzschia porteri Frenguelli, 1949 † (original description)
Nitzschia tiltilensis Frenguelli, 1949 † (original description)
Opephoropsis tiltilensis Frenguelli, 1949 (original description)
Plagiogramma robustum (Brun in Brun & Tempère) Frenguelli, 1949 (new combination reference)
Pleurosigma affine var. temperei Frenguelli, 1949 (original description)
Pseudonitzschia fossilis (original description)
Pseudonitzschia fossilis var. fossilis Frenguelli, 1949 (original description)
Stephanopyxis furcata (Grove ex Rattray) Frenguelli, 1949 (new combination reference)
Stephanopyxis megastoma Frenguelli, 1949 (original description)
Stephanopyxis porteri Frenguelli, 1949 (original description)
Stephanopyxis tiltilensis Frenguelli, 1949 (original description)
Trachyneis hungarica (Pantocsek) Frenguelli, 1949 accepted as Navicula aspera var. hungarica Pantocsek, 1889 (new combination reference)
Triceratium andetiluvianum var. temperei Frenguelli, 1949 (original description)
Tryblionella tiltilensis Frenguelli, 1949 † (original description)