Adelopoma costaricense Bartsch & J. P. E. Morrison, 1942 (basis of record)
Adelopoma stolli (E. von Martens, 1890) (basis of record)
Alcadia (Microalcadia) exigua (L. Pfeiffer, 1849) represented as Alcadia exigua (L. Pfeiffer, 1849) (basis of record)
Alcadia exigua (L. Pfeiffer, 1849) (basis of record)
Amecanauta jaliscoensis D. W. Taylor, 2003 (basis of record)
Amnipila pila (Pilsbry & Hinkley, 1910) (additional source)
Amphicyclotus boucardi (L. Pfeiffer, 1857) (basis of record)
Amphicyclotus maleri Crosse & P. Fischer, 1883 (basis of record)
Amphicyclotus megaplanus J. P. E. Morrison, 1955 (basis of record)
Amphicyclotus palenquensis (Pilsbry, 1935) (basis of record)
Amphicyclotus parvus F. G. Thompson, 1963 (basis of record)
Amphicyclotus paulsonorum F. G. Thompson, 1969 (basis of record)
Amphicyclotus ponderosus (L. Pfeiffer, 1853) (basis of record)
Amphicyclotus texturatus (G. B. Sowerby I, 1850) (basis of record)
Amphicyclotus texturatus goldfussi (O. Boettger, 1892) (basis of record)
Amphicyclotus texturatus spiralis F. G. Thompson, 1969 (basis of record)
Amphicyclotus texturatus texturatus (G. B. Sowerby I, 1850) (basis of record)
Anisospira (Anisospira) dalli (E. von Martens, 1901) represented as Anisospira dalli (E. von Martens, 1901) (basis of record)
Anisospira (Anisospira) dalli dalli (E. von Martens, 1901) represented as Anisospira dalli dalli (E. von Martens, 1901) (basis of record)
Anisospira (Anisospira) dalli stringens F. G. Thompson, 1968 represented as Anisospira dalli stringens F. G. Thompson, 1968 (basis of record)
Anisospira (Anisospira) liebmanni (L. Pfeiffer, 1846) represented as Anisospira liebmanni (L. Pfeiffer, 1846) (basis of record)
Anisospira (Anisospira) vonmartensi (Strebel, 1879) represented as Anisospira vonmartensi (Strebel, 1879) (basis of record)
Anisospira (Trachycion) hadromylla F. G. Thompson, 1968 represented as Anisospira hadromylla F. G. Thompson, 1968 (basis of record)
Anisospira (Trachycion) recticosta (L. Pfeiffer, 1847) represented as Anisospira recticosta (L. Pfeiffer, 1847) (basis of record)
Anisospira (Trachycion) recticosta recticosta (L. Pfeiffer, 1847) represented as Anisospira recticosta recticosta (L. Pfeiffer, 1847) (basis of record)
Anisospira (Trachycion) recticosta townsendi Pilsbry & T. D. A. Cockerell, 1903 represented as Anisospira recticosta townsendi Pilsbry & T. D. A. Cockerell, 1903 (basis of record)
Anisospira (Trachycion) strebeli Pfeffer, 1887 represented as Anisospira strebelii Pfeffer, 1887 (basis of record)
Anisospira (Trachycion) velascorum Breure, 1977 represented as Anisospira velascorum Breure, 1977 (basis of record)
Anisospira dalli (E. von Martens, 1901) (basis of record)
Anisospira dalli dalli (E. von Martens, 1901) (basis of record)
Anisospira dalli stringens F. G. Thompson, 1968 (basis of record)
Anisospira hadromylla F. G. Thompson, 1968 (basis of record)
Anisospira liebmanni (L. Pfeiffer, 1846) (basis of record)
Anisospira recticosta (L. Pfeiffer, 1847) (basis of record)
Anisospira recticosta recticosta (L. Pfeiffer, 1847) (basis of record)
Anisospira recticosta townsendi Pilsbry & T. D. A. Cockerell, 1903 (basis of record)
Anisospira strebelii Pfeffer, 1887 (basis of record)
Anisospira velascorum Breure, 1977 (basis of record)
Anisospira vonmartensi (Strebel, 1879) (basis of record)
Aperostoma Troschel, 1847 (basis of record)
Aperostoma mexicanum (Menke, 1830) (basis of record)
Aperostoma mexicanum mexicanum (Menke, 1830) (basis of record)
Aperostoma mexicanum salleanum (E. von Martens, 1865) (basis of record)
Aperostoma palmeri (Bartsch & J. P. E. Morrison, 1942) (basis of record)
Aroapyrgus H. B. Baker, 1931 (basis of record)
Aroapyrgus alleei J. P. E. Morrison, 1946 (additional source)
Aroapyrgus chagresensis J. P. E. Morrison, 1946 (additional source)
Aroapyrgus cisterninus (B. Walker, 1919) (additional source)
Aroapyrgus clenchi (C. Goodrich & Van der Schalie, 1937) (additional source)
Aroapyrgus conchensensis (B. Walker, 1919) (additional source)
Aroapyrgus costaricensis (Mörch, 1860) (additional source)
Aroapyrgus guatemalensis (P. Fischer & Crosse, 1891) (basis of record)
Aroapyrgus hinkleyi (B. Walker, 1919) (additional source)
Aroapyrgus joseanus J. P. E. Morrison, 1946 (additional source)
Aroapyrgus mexicanus (Pilsbry, 1910) (additional source)
Aroapyrgus orizabensis (Crosse & P. Fischer, 1891) (additional source)
Aroapyrgus panamensis (Tryon, 1863) (additional source)
Aroapyrgus panzosensis (B. Walker, 1919) (additional source)
Aroapyrgus pasionensis (C. Goodrich & Van der Schalie, 1937) (additional source)
Aroapyrgus petenensis (Morelet, 1851) (additional source)
Aroapyrgus rhegoides (Morelet, 1851) (additional source)
Aroapyrgus stolli (E. von Martens, 1901) (basis of record)
Aroapyrgus subangulatus (E. von Martens, 1899) (additional source)
Aroapyrgus tryoni (Pilsbry, 1904) (basis of record)
Ashmunella intricata Pilsbry, 1948 (basis of record)
Ashmunella juarazensis Pilsbry, 1948 (basis of record)
Ashmunella meridionalis Pilsbry, 1948 (basis of record)
Ashmunella milesi Reeder, 1993 (basis of record)
Ashmunella montivaga Pilsbry, 1948 (basis of record)
Assiminea cienegensis Hershler, H.-P. Liu & B. K. Lang, 2007 (basis of record)
Austrinauta elatus (A. A. Gould, 1853) (basis of record)
Averellia macneili (Crosse, 1873) (basis of record)
Barbacyclus boucardi (Angas, 1878) (basis of record)
Barbacyclus princeps (Pilsbry, 1935) (basis of record)
Barbacyclus underwoodi (S. I. Da Costa, 1900) (basis of record)
Beckianum beckianum (L. Pfeiffer, 1846) (basis of record)
Beckianum beckianum beckianum (L. Pfeiffer, 1846) (basis of record)
Beckianum beckianum gabbianum (Angas, 1879) (basis of record)
Beckianum sinistrum (E. von Martens, 1898) (basis of record)
Belocaulus angustipes (Heynemann, 1885) (basis of record)
Berendtia taylori (L. Pfeiffer, 1861) (basis of record)
Binneya (Allothyra) guadalupensis Pilsbry, 1927 represented as Binneya guadalupensis Pilsbry, 1927 (basis of record)
Binneya (Binneya) notabilis J. G. Cooper, 1863 represented as Binneya notabilis J. G. Cooper, 1863 (basis of record)
Binneya guadalupensis Pilsbry, 1927 (basis of record)
Binneya notabilis J. G. Cooper, 1863 (basis of record)
Biomphalaria albicans (L. Pfeiffer, 1839) (basis of record)
Biomphalaria belizensis (Crosse & P. Fischer, 1879) (basis of record)
Biomphalaria boucardianus (Preston, 1907) (basis of record)
Biomphalaria fieldii (Tryon, 1863) (basis of record)
Biomphalaria gracilenta (A. A. Gould, 1855) (basis of record)
Biomphalaria hondurasensis (Clessin, 1878) (basis of record)
Biomphalaria orbicula (Morelet, 1849) (basis of record)
Biomphalaria panamensis (Dunker, 1848) (basis of record)
Biomphalaria petenensis (Morelet, 1851) (basis of record)
Biomphalaria retusa (Morelet, 1849) (basis of record)
Biomphalaria tepicensis (E. von Martens, 1899) (basis of record)
Bothriopupa breviconus Pilsbry, 1917 (basis of record)
Bothriopupa conoidea (L. Pfeiffer, 1853) (basis of record)
Bothriopupa leucodon (Morelet, 1851) (basis of record)
Bothriopupa tenuidens (C. B. Adams, 1845) (basis of record)