| Nominal Species (n = 142) | Present allocation (n = 141) | Ref. |
|---|---|---|
| Pyrgulopsis aardahli Hershler, 1989 | Pyrgulopsis aardahli | 19 |
| Hydrobia acuta neglecta Muus, 1963 | Hydrobia acuta | 3477 |
| Tryonia adamantina Taylor, 1987 | Tryonia adamantina | 19 |
| Tryonia alamosae Taylor, 1987 | Tryonia alamosae | 19 |
| Somatogyrus alcoviensis Krieger, 1972 | Somatogyrus alcoviensis | 19 |
| Pyrgulopsis amargosae Hershler, 1989 | Pyrgulopsis amargosae | 19 |
| Somatogyrus amnicoloides Walker, 1915 | Somatogyrus amnicoloides | 19 |
| Tryonia angulata Hershler & Sada, 1987 | Tryonia angulata | 19 |
| Littoridina angustiarum Preston, 1915 | Littoridina angustiarum | 83435 |
| Hydrobia antarctica Philippi, 1868 | Hydrobia antarctica | 83435 |
| Helobia aperta Hass, 1955 | Helobia aperta | 2384 |
| Somatogyrus aureus Tryon, 1865 | Somatogyrus aureus | 19 |
| Paludina australis d'Orbigny, 1835 | Heleobia australis | 83435 |
| Pyrgulopsis bacchus Hershler, 1988 | Pyrgulopsis bacchus | 19 |
| Odostomia barretti Morrison, 1965 | Texadina barretti | 83435 |
| Stygopyrgus bartonensis Hershler & Longley, 1986 | Stygopyrgus bartonensis | 19 |
| Somatogyrus biangulatus Walker, 1906 | Somatogyrus biangulatus | 19 |
| Hydrobia booneae Morrison, 1954 | Hydrobia booneae | 19 |
| Pyrgulopsis bruneauensis Hershler, 1990 | Pyrgulopsis bruneauensis | 19 |
| Pyrgulopsis bryantwalkeri Hershler, 1994 | Pyrgulopsis bryantwalkeri | 19 |
| Heleobops carrikeri Davis & McKee, 1989 | Heleobops carrikeri | 19 |
| Tryonia clathrata Stimpson, 1865 | Tryonia clathrata | 19 |
| Amnicola comalensis Pilsbry & Ferriss, 1906 | Cincinnatia comalensis | 75097 |
| Littoridina conexa Gaillard, 1974 | Heleobia conexa | 83435 |
| Phreatodrobia conica Hershler & Longley, 1986 | Phreatodrobia conica | 19 |
| Pyrgulopsis conica Hershler, 1988 | Pyrgulopsis conica | 19 |
| Spilochlamys conica Thompson, 1968 | Spilochlamys conica | 19 |
| Somatogyrus constrictus Walker, 1904 | Somatogyrus constrictus | 19 |
| Somatogyrus coosaensis Walker, 1904 | Somatogyrus coosaensis | 19 |
| Amnicola cora Hubricht, 1979 | Amnicola cora | 19 |
| Paludina coronatus Pfeiffer, 1840 | Pyrgophorus coronatus | 83435 |
| Somatogyrus crassilabris Walker, 1915 | Somatogyrus crassilabris | 19 |
| Somatogyrus crassus Walker, 1904 | Somatogyrus crassus | 19 |
| Pyrgulopsis crystalis Hershler & Sada, 1987 | Pyrgulopsis crystalis | 19 |
| Helobia cuzcoensis Pilsbry, 1911 | Helobia cuzcoensis | 2384 |
| Rhapinema dacryon Thompson, 1970 | Rhapinema dacryon | 19 |
| Lyogyrus dalli Pilsbury & Beecher, 1892 | Amnicola dalli | 75097 |
| Somatogyrus decipiens Walker, 1909 | Somatogyrus decipiens | 19 |
| Pyrgulopsis diablensis Hershler, 1995 | Pyrgulopsis diablensis | 19 |
| Hydrobia djerbaensis Wilke, Pfenninger & Davis, 2002 | Hydrobia djerbaensis | 1056 |
| Heleobops docimus Thompson, 1968 | Heleobops docimus | 19 |
| Tryonia elata Hershler & Sada, 1987 | Tryonia elata | 19 |
| Pyrgulopsis eremica Hershler, 1995 | Pyrgulopsis eremica | 19 |
| Tryonia ericae Hershler & Sada, 1987 | Tryonia ericae | 19 |
| Potamopyrgus estuarinus Winterbourn, 1970 | Potamopyrgus estuarinus | 3477 |
| Somatogyrus excavatus Walker, 1906 | Somatogyrus excavatus | 19 |
| Pyrgulopsis fairbanksensis Hershler & Sada, 1987 | Pyrgulopsis fairbanksensis | 19 |
| Littoridina faminensis Preston, 1915 | Littoridina faminensis | 83435 |
| Dasyscias franzi Thompson & Hershler, 1991 | Dasyscias franzi | 19 |
| Cincinnatia fraterna Thompson, 1968 | Cincinnatia fraterna | 19 |
| Somatogyrus georgianus Walker, 1904 | Somatogyrus georgianus | 19 |
| Pyrgulopsis gibba Hershler, 1995 | Pyrgulopsis gibba | 19 |
| Tryonia gilae Taylor, 1987 | Tryonia gilae | 19 |
| Pyrgulopsis giuliani Hershler & Pratt, 1990 | Pyrgulopsis giuliani | 19 |
| Pyrgulopsis glandulosa Hershler, 1988 | Pyrgulopsis glandulosa | 19 |
| Caspia gmelinii Clessin & Dybowski, 1887 | Clathrocaspia gmelinii | 3477 |
| Spilochlamys gravis Thompson, 1968 | Spilochlamys gravis | 19 |
| Pyrgulopsis greggi Hershler, 1995 | Pyrgulopsis greggi | 19 |
| Cincinnatia helicogyra Thompson, 1968 | Cincinnatia helicogyra | 19 |
| Somatogyrus hendersoni Walker, 1909 | Somatogyrus hendersoni | 19 |
| Pyrgulopsis hershleri Thompson, 1995 | Pyrgulopsis hershleri | 19 |
| Somatogyrus hinkleyi Walker, 1904 | Somatogyrus hinkleyi | 19 |
| Somatogyrus humerosus Walker, 1906 | Somatogyrus humerosus | 19 |
| Phreatodrobia imitata Hershler & Longley, 1986 | Phreatodrobia imitata | 19 |
| Paludestrina imitator Pilsbry, 1899 | Tryonia imitator | 75097 |
| Pyrgulopsis isolata Hershler & Sada, 1987 | Pyrgulopsis isolata | 19 |
| Onoba jacksoni Bartsch, 1953 | Onobops jacksoni | 83435 |
| Potamopyrgus kaitunuparaoa Haase, 2008 | Potamopyrgus kaitunuparaoa | 3477 |
| Tryonia kosteri Taylor, 1987 | Tryonia kosteri | 19 |
| Helobia lacustris Hass, 1955 | Helobia lacustris | 2384 |
| Helobia languiensis Hass, 1955 | Helobia languiensis | 2384 |
| Lyogyrus latus Thompson & Hershler, 1991 | Lyogyrus latus | 19 |
| Littoridina limosa Preston, 1915 | Littoridina limosa | 83435 |
| Littoridina lioneli Preston, 1915 | Littoridina lioneli | 83435 |
| Pyrgulopsis longae Hershler, 1995 | Pyrgulopsis longae | 19 |
| Texapyrgus longleyi Thompson & Hershler, 1991 | Texapyrgus longleyi | 19 |
| Tryonia margae Hershler, 1989 | Tryonia margae | 19 |
| Antillobia margalefi Altaba, 1993 | Antillobia margalefi | 83435 |
| Cincinnatia mica Thompson, 1968 | Cincinnatia mica | 19 |
| Hydrobia minuta Totten | Hydrobia minuta | 19 |
| Pyrgulopsis montezumensis Hershler, 1988 | Pyrgulopsis montezumensis | 19 |
| Pyrgulopsis morrisoni Hershler, 1988 | Pyrgulopsis morrisoni | 19 |
| Stiobia nana Thompson, 1978 | Stiobia nana | 19 |
| Pyrgulopsis nanus Hershler & Sada, 1987 | Pyrgulopsis nanus | 19 |
| Somatogyrus nanus Walker, 1904 | Somatogyrus nanus | 19 |
| Somatogyrus obtusus Walker, 1904 | Somatogyrus obtusus | 19 |
| Ascorhis occidua Ponder & Clark, 1988 | Ascorhis occidua | 3204 |
| Pyrgulopsis owensensis Hershler, 1989 | Pyrgulopsis owensensis | 19 |
| Pyrgulopsis ozarkensis Hinkley, 1915 | Pyrgulopsis ozarkensis | 19 |
| Littoridinops palustris Thompson, 1968 | Littoridinops palustris | 19 |
| Cincinnatia parva Thompson, 1968 | Cincinnatia parva | 19 |
| Somatogyrus parvulus Tryon, 1865 | Somatogyrus parvulus | 19 |
| Somatogyrus pennsylvanicus Walker, 1904 | Somatogyrus pennsylvanicus | 19 |
| Pyrgulopsis perturbata Hershler, 1989 | Pyrgulopsis perturbata | 19 |
| Cincinnatia petrifons Thompson, 1968 | Cincinnatia petrifons | 19 |
| Somatogyrus pilsbryanus Walker, 1904 | Somatogyrus pilsbryanus | 19 |
| Pyrgulopsis pisteri Hershler & Sada, 1987 | Pyrgulopsis pisteri | 19 |
| Phreatodrobia plana Hershler & Longley, 1986 | Phreatodrobia plana | 19 |
| Pyrgophorus platyrachis Thompson, 1968 | Pyrgophorus platyrachis | 19 |
| Cincinnatia ponderosa Thompson, 1968 | Cincinnatia ponderosa | 19 |
| Helobia profunda Hass, 1955 | Helobia profunda | 2384 |
| Probythinella protera Pilsbry, 1953 | Probythinella protera | 19 |
| Hydrobia pumilio Smith, 1875 | Hydrobia pumilio | 83435 |
| Phreatodrobia punctata Hershler & Longley, 1986 | Phreatodrobia punctata | 19 |
| Somatogyrus pygmaeus Walker, 1909 | Somatogyrus pygmaeus | 19 |
| Somatogyrus quadratus Walker, 1906 | Somatogyrus quadratus | 19 |
| Tryonia quitobaquitae Hershler, 1988 | Tryonia quitobaquitae | 19 |
| Somatogyrus rheophilas Thompson, 1984 | Somatogyrus rheophilas | 19 |
| Amnicola rhombostoma Thompson, 1968 | Amnicola rhombostoma | 19 |
| Heleobia robusta da Silva & Veitenheimer-Mendes, 2004 | Tryonia robusta | 83435 |
| Tryonia robusta Hershler, 1989 | Tryonia robusta | 19 |
| Somatogyrus rosewateri Gordon, 1986 | Somatogyrus rosewateri | 19 |
| Phreatodrobia rotunda Hershler & Longley, 1986 | Phreatodrobia rotunda | 19 |
| Tryonia rowlandsi Hershler, 1989 | Tryonia rowlandsi | 19 |
| Tryonia salina Hershler, 1989 | Tryonia salina | 19 |
| Paludestrina salsa Pilsbry, 1905 | Spurwinkia salsa | 83435 |
| Somatogyrus sargenti Pilsbry, 1895 | Somatogyrus sargenti | 19 |
| Notogillia sathon Thompson, 1969 | Notogillia sathon | 19 |
| Taylorconcha serpenticola Hershler, et al., 1994 | Taylorconcha serpenticola | 19 |
| Pyrgulopsis simplex Hershler, 1988 | Pyrgulopsis simplex | 19 |
| Pyrgulopsis sola Hershler, 1988 | Pyrgulopsis sola | 19 |
| Somatogyrus strengi Pilsbry & Walker, 1906 | Somatogyrus strengi | 19 |
| Amnicola stygius Hubricht, 1971 | Amnicola stygius | 19 |
| Somatogyrus substriatus Walker, 1906 | Somatogyrus substriatus | 19 |
| Pyrgulopsis taylori Hershler, 1995 | Pyrgulopsis taylori | 19 |
| Somatogyrus tenax Thompson, 1969 | Somatogyrus tenax | 19 |
| Somatogyrus tennesseensis Walker, 1906 | Somatogyrus tennesseensis | 19 |
| Pyrgulopsis thompsoni Hershler, 1988 | Pyrgulopsis thompsoni | 19 |
| Hydrobia totteni Morrison, 1954 | Hydrobia totteni | 19 |
| Somatogyrus tryoni Pilsbry & Baker, 1927 | Somatogyrus tryoni | 19 |
| Spilochlamys turgida Thompson, 1969 | Spilochlamys turgida | 19 |
| Turbo ulvae Pennant, 1777 | Peringia ulvae | 3477 |
| Heligmopoma umbilicatum Hass, 1955 | Heligmopoma umbilicatum | 2384 |
| Holsingeria unthanksensis Hershler, 1989 | Holsingeria unthanksensis | 19 |
| Tryonia variegata Hershler & Sada, 1987 | Tryonia variegata | 19 |
| Pyrgulopsis ventricosa Hershler, 1995 | Pyrgulopsis ventricosa | 19 |
| Somatogyrus virginicus Walker, 1904 | Somatogyrus virginicus | 19 |
| Somatogyrus walkerianus Aldrich, 1905 | Somatogyrus walkerianus | 19 |
| Cincinnatia wekiwae Thompson, 1968 | Cincinnatia wekiwae | 19 |
| Hydrobia wetherbyi Dall, 1885 | Notogillia wetherbyi | 75097 |
| Somatogyrus wheeleri Walker, 1915 | Somatogyrus wheeleri | 19 |
| Amnicola winkleyi Pilsbry, 1912 | Amnicola winkleyi | 19 |