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Bullata Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 48.
(homonym of Jousseaume, 1875 [Gastr.]; intro'd as sub-gen. of Quadrula Rafinesque, 1820; renamed Pustulosa Frierson, 1927)
Type species: Obliquaria (Quadrula) bullata Rafinesque, 1820 (original designation) = Pustulosa pustulosa

Capsaeformis Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 95.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio capsaeformis Lea, 1834 (orig. desig.) = Epioblasma capsaeformis

Cyrtonais Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 84.
(error for Cyrtonaias Fischer & Crosse, 1894)

Delphinonais Frierson, 1927
‘Crosse & Fischer’ Frierson, 1927. Check List N. Amer. Naiades: 84.
(error for Delphinonaias Fischer & Crosse, 1894)

Elliptoideus Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 33.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio sloatianus Lea, 1840 (orig. desig.) = Elliptoideus sloatianus

Eurynaia Frierson, 1927
‘Rafinesque’ Frierson, 1927. Check List N. Amer. Naiades: 10, 33.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819; error for Eurynia Rafinesque, 1820)

Fusconia Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 10, 54.
(error for Fusconaia Simpson, 1900)

Luteacarnea Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: errata et corrigenda.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; new name for Striata Frierson, 1927)

Martensnaias Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio rubicundus Martens, 1900 (orig. desig.) = Psoronaias rubicunda

Nephritica Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio poeyanus Lea, 1857 (orig. desig.) = Nephritica poeyana

Obliquata Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 52.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Obliquaria (Scalenaria) obliquata Rafinesque, 1820 (orig. desig.) = Epioblasma obliquata

Ortmanniana Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 79.
(intro'd as sub-gen. of Lampsilis Rafinesque, 1820)
Type species: Unio carinatus Barnes, 1823 (original designation) = Ortmanniana ligamentina

Penita Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 93.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio penitus Conrad, 1834 (orig. desig.) = Epioblasma penita

Pleuronaia Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 58.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; correct name for Pleuronia Frierson, 1927)
Type species: Unio barnesianus Lea, 1838 (orig. desig.) = Pleuronaia barnesiana

Pleuronia Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 10.
(incorrect original spelling of Pleuronaia Frierson, 1927)
Type species: Unio barnesianus Lea, 1838 = Pleuronaia barnesiana

Popenaias Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio popeii Lea, 1857 (orig. desig.) = Popenaias popeii

Pseudodontoideus Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 23.
(intro'd as sub-gen. of Strophitus Rafinesque, 1820)
Type species: Margaritana alabamensis Lea, 1861 (orig. desig.) = Pseudodontoideus connasaugaensis

Pustulosa Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: errata et corrigenda.
Thiele, 1934. Handb. Syst. Weichtierk. 3: 827 [1260].
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; new name for Bullata Frierson, 1927)

Reticulatus Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 10 [as ‘Reticulata’], 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Nephronaias reticulatus Simpson, 1900 (orig. desig.) = Arotonaias reticulata

Striata Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 50.
(homonym of O. Boettger, 1878 [Gastro.]; intro'd as sub-gen. of Quadrula Rafinesque, 1820; renamed Luteacarnea Frierson, 1927)
Type species: Obovaria striata Rafinesque, 1820 (orig. desig.) = Obovaria subrotunda

Subtentus Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 65.
(intro'd as sub-gen. of Ptychobranchus Simpson, 1900)
Type species: Unio subtentus Say, 1825 (orig. desig.) = Ptychobranchus subtentus

Torulosa Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 94.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Amblema torulosa Rafinesque, 1820 (orig. desig.) = Epioblasma torulosa

Utterbackiana Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 17.
(intro'd as sub-gen. of Anodonta Lamarck, 1799)
Type species: Anodonta suborbiculata Say, 1831 (orig. desig.) = Utterbackiana suborbiculata

Venusta Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 81.
(homonym of O. Boettger, 1877 [Gastro.]; intro'd as sub-gen. of Lampsilis Rafinesque, 1820; renamed Venustaconcha Frierson, 1927)
Type species: Unio venustus Lea, 1838 (orig. desig.) = Venustaconcha ellipsiformis

Venustaconcha Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: errata et corrigenda.
Thiele, 1934. Handb. Syst. Weichtierk. 3: 837 [1273].
(new name for Venusta Frierson, 1927)

Villosa Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 80.
(intro'd as sub-gen. of Lampsilis Rafinesque, 1820)
Type species: Unio villosus B.H. Wright, 1898 (orig. desig.) = Villosa villosa