Anculopsis utahensis (Yen, 1947) † (basis of record)
Brannerillus involutus Pilsbry, 1934 † accepted as Brannerillus physispira Hannibal, 1912 † (source of synonymy)
Brannerillus involutus praeposterus Pilsbry, 1934 † accepted as Brannerillus physispira Hannibal, 1912 † (source of synonymy)
Brannerillus involutus thremma Pilsbry, 1935 † accepted as Brannerillus physispira Hannibal, 1912 † (source of synonymy)
Bulimnea petaluma (G. D. Hanna, 1923) † (basis of record)
Fluminicola weaveri Yen, 1944 † (additional source)
Fluminicola yatesiana utahensis Yen, 1947 † accepted as Pyrgulopsis nanna (Chamberlin & E. G. Berry, 1933) † (source of synonymy)
Gonidea malheurensis (J. Henderson & Rodeck, 1934) † (basis of record)
Goniobasis taylori var. calkinsi Dall, 1924 † accepted as Goniobasis taylori (Gabb, 1866) † (source of synonymy)
Gyraulus annectans Chamberlin & E. G. Berry, 1933 † accepted as Idahoella monocarinata (Chamberlin & E. G. Berry, 1933) † (source of synonymy)
Gyraulus monocarinatus Chamberlin & E. G. Berry, 1933 † accepted as Idahoella monocarinata (Chamberlin & E. G. Berry, 1933) † (additional source)
Gyraulus pleiopleurus (G. D. Hanna, 1923) † (basis of record)
Hannibalina G. D. Hanna & Gester, 1963 † (status source)
Helisoma kettlemanensis Pilsbry, 1934 † (basis of record)
Helisoma marshalli (Arnold, 1909) † (basis of record)
Helisoma sanctaeclarae (Hannibal, 1909) † (basis of record)
Idahoella monocarinata (Chamberlin & E. G. Berry, 1933) † (additional source)
Juga arnoldiana (Pilsbry, 1934) † (basis of record)
Juga chrysopylica D. W. Taylor, 1966 † (original description)
Juga kettlemanensis (Arnold, 1909) † (basis of record)
Juga kettlemanensis woodringi (Pilsbry, 1934) † accepted as Juga kettlemanensis (Arnold, 1909) † (basis of record)
Lithasia antiqua Gabb, 1866 † accepted as Pilsbryus occidentalis (J. Hall, 1845) † (source of synonymy)
Lymnaea (Pseudosuccinea) aperta W. B. Marshall, 1926 † accepted as Oxyloma barberi (W. B. Marshall, 1926) (source of synonymy)
Lymnaea idahoensis Yen, 1946 † accepted as Radix intermontana D. W. Taylor, 1966 † (status source)
Lymnaea kerri G. D. Hanna, 1923 † accepted as Lymnaea limatula G. D. Hanna, 1923 † (source of synonymy)
Lymnaea limatula G. D. Hanna, 1923 † (additional source)
Melania decursa Conrad, 1871 † accepted as Goniobasis taylori (Gabb, 1866) † (source of synonymy)
Omalodiscus pattersoni (F. C. Baker, 1938) † (basis of record)
Orygoceras tricarinatum Yen, 1944 † accepted as Orygoceras (Ibicicornu) arcuatum Dall, 1924 † accepted as Orygoceras arcuatum Dall, 1924 † (source of synonymy)
Oxyloma barberi (W. B. Marshall, 1926) (basis of record)
Parapholyx packardi var. corrugata F. C. Baker, 1942 † accepted as Vorticifex packardi (G. D. Hanna, 1922) † (source of synonymy)
Payettia Dall, 1924 † (additional source)
Pilsbryus antiquus (Gabb, 1866) † accepted as Pilsbryus occidentalis (J. Hall, 1845) † (source of synonymy)
Pilsbryus antiquus utahensis Yen, 1947 † accepted as Pilsbryus occidentalis utahensis Yen, 1947 † (source of synonymy)
Pilsbryus occidentalis (J. Hall, 1845) † (additional source)
Pilsbryus superbus Yen, 1944 † (additional source)
Pisidium compressum praecompressum Pilsbry, 1935 † accepted as Euglesa supina (A. Schmidt, 1851) (source of synonymy)
Planorbella (Seminolina) wilsoni D. W. Taylor, 1966 † represented as Planorbella wilsoni D. W. Taylor, 1966 † (original description)
Planorbella conanti (Dall, 1890) † (basis of record)
Planorbella disstoni (Dall, 1890) † (basis of record)
Planorbella duryi preglabratus (W. B. Marshall, 1926) † (additional source)
Platytaphius chestermani G. D. Hanna & Gester, 1963 † accepted as Biomphalaria chestermani (G. D. Hanna & Gester, 1963) † (additional source)
Pliopholygidae D. W. Taylor, 1966 † (original description)
Pliopholyx campbelli (Dall, 1924) † (basis of record)
Pompholopsis planospiralis Yen, 1947 † accepted as Vorticifex utahensis (Yen, 1947) † (source of synonymy)
Pseudosuccinea dineana (D. W. Taylor, 1957) † (basis of record)
Radix intermontana D. W. Taylor, 1966 † (original description)
Radix malheurensis (J. Henderson & Rodeck, 1934) † (basis of record)
Sphaerium cooperi Arnold, 1909 † accepted as Sphaerium striatinum (Lamarck, 1818) (source of synonymy)
Sphaerium meeki Dall, 1924 † accepted as Sphaerium idahoense Meek, 1870 † (source of synonymy)
Stenophysa meigsii (Dall, 1890) † (basis of record)
Tryonia stokesi (Arnold, 1903) † (basis of record)
Turritella bilineata J. Hall, 1845 † accepted as Goniobasis taylori (Gabb, 1866) † (status source)
Vorticifex durhami (Glen, 1960) † (basis of record)
Vorticifex laxus Chamberlin & E. G. Berry, 1933 † (additional source)
Vorticifex minimus (Yen, 1947) † (basis of record)
Vorticifex packardi (G. D. Hanna, 1922) † (basis of record)
Vorticifex utahensis (Yen, 1947) † (basis of record)
Zetekina woodringi (Pilsbry, 1934) † (basis of record)