Amphora bigibba var. capitata R.Hagelstein, 1939 (original description)
Caloneis disticha (Schmidt in Schmidt et al.) Hagelstein, 1939 accepted as
Navicula disticha Schmidt in Schmidt et al., 1897 (new combination reference)
Caloneis liber var. incerta Hagelstein, 1939 (original description)
Campylodiscus cordatus Hagelstein, 1939 (original description)
Cocconeis singularis Hagelstein, 1939 (original description)
Cyclotella insolita Hagelstein, 1939 (original description)
Cymbella coamoensis Hagelstein, 1939 (original description)
Diploneis gravelleana Hagelstein, 1939 (original description)
Diploneis smithii var. adversa R.Hagelstein (original description)
Eunotia indica var. undulata Hagelstein, 1939 (original description)
Eunotia lunaris var. duolineata Hagelstein, 1939 (original description)
Gomphonema carolinense Hagelstein, 1939 (original description)
Gyrosigma acuminatum var. angulatum Hagelstein, 1939 (original description)
Gyrosigma variipunctatum Hagelstein, 1939 (original description)
Gyrosigma variistriatum Hagelstein, 1939 (original description)
Homoeocladia vidovichii var. nodulosa Hagelstein, 1939 (original description)
Mastogloia obliqua Hagelstein, 1939 (original description)
Mastogloia sancti-johannis Hagelstein, 1939 (original description)
Navicula borinquensis Hagelstein, 1939 (original description)
Navicula congerana Hagelstein, 1939 (original description)
Navicula expansa Hagelstein, 1939 accepted as
Navicula zeta Cleve, 1895 (original description)
Navicula guaynaboensis Hagelstein, 1939 (original description)
Navicula howeana Hagelstein, 1939 accepted as
Haslea howeana (Hagelstein) Giffen, 1980 (original description)
Navicula incomposita var. incomposita Hagelstein, 1939 (original description)
Navicula incomposita var. minor Hagelstein, 1939 (original description)
Navicula lyra var. irregularis Hagelstein, 1939 (original description)
Navicula mannii Hagelstein, 1939 (original description)
Navicula tubulosa var. rhomboidea Hagelstein, 1939 (original description)
Navicula tubulosa var. tubulosa sensu Hagelstein, 1939 (original description)
Nitzschia brittonii Hagelstein, 1939 (original description)
Nitzschia hemistriata Hagelstein, 1939 (original description)
Nitzschia miramarensis Hagelstein, 1939 (original description)
Nitzschia obtusa var. lata Hagelstein, 1939 (original description)
Nitzschia obtusa var. undulata Hagelstein, 1939 (original description)
Nitzschia ponciensis R.Hagelstein, 1938 (original description)
Nitzschia quickiana Hagelstein, 1939 (original description)
Pinnularia latevittata var. minor Hagelstein ex Kociolek, 2003 (original description)
Pinnularia titusiana Hagelstein, 1939 (original description)
Pinnularia viridis var. subconstricta Hagelstein, 1938 (original description)
Pleurosigma angusticonvexum Hagelstein, 1939 (original description)
Pleurosigma portoricense Hagelstein, 1939 (original description)
Pleurosigma strigosum var. incisum Hagelstein, 1939 (original description)
Rhaphoneis crucifera (Kitton) Hagelstein, 1939 accepted as
Amphitetras crucifera Kitton in Ralfs in Pritchard, 1861 (new combination reference)
Stauroneis similaris Hagelstein, 1939 (original description)
Trachyneis aspera var. atomus Hagelstein, 1939 (original description)
Tropidoneis vanheurckii var. maxima Hagelstein, 1939 (original description)