Here are all of Pennsylvania’s land snails, listed systematically. You can sample the state’s land snail diversity by clicking on highlighted species names.

* = non-native species		Ed Thompson
Helicinidae
	Hendersonia occulta (Say, 1831)
Pomatiopsidae
	Pomatiopsis lapidaria (Say, 1817)
Carychiidae
	Carychium clappi Hubricht, 1959 Carychium exiguum (Say, 1822) Carychium exile I. Lea, 1842 Carychium nannodes G.H. Clapp, 1905

Cionellidae
	Cochlicopa lubrica (Müller, 1774) Cochlicopa lubricella (Porro, 1838) Cochlicopa morseana (Doherty, 1878) Cochlicopa nitens (Gallenstein, 1848)
Valloniidae
	Vallonia costata (Müller, 1774) Vallonia excentrica Sterki, 1893 Vallonia pulchella (Müller, 1774)
Pupillidae
	Pupoides albilabris (C.B. Adams, 1841)
Gastrocoptidae
	Gastrocopta armifera (Say, 1821) Gastrocopta contracta (Say, 1822) Gastrocopta corticaria (Say, 1816) Gastrocopta pentodon (Say, 1822) Gastrocopta tappaniana (C.B. Adams, 1842)
Vertiginidae
	Vertigo bollesiana (E.S. Morse, 1865) Vertigo gouldi (A. Binney, 1843) Vertigo milium (Gould, 1840) Vertigo ovata Say, 1822 Vertigo pygmaea (Draparnaud, 1801) Vertigo tridentata Wolf, 1870 Vertigo ventricosa (E.S. Morse, 1865)
Truncatellinidae
	Columella simplex (Gould, 1840)
Strobilopsidae
	Strobilops aeneus Pilsbry, 1926 Strobilops affinis Pilsbry, 1893 Strobilops labyrinthicus (Say, 1817) Strobilops texasiana Pilsbry & Ferriss, 1906
Succineidae
	Catinella oklahomarum (Webb, 1953) Catinella vermeta (Say, 1829) Novisuccinea ovalis (Say, 1817) Oxyloma retusum (I. Lea, 1834) Oxyloma subeffusum Pilsbry, 1948 Succinea putris (Linné, 1758)
Discidae
	Anguispira alternata (Say, 1816) Anguispira fergusoni (Bland, 1861) Anguispira kochi (Pfeiffer, 1821) Discus catskillensis (Pilsbry, 1896) Discus patulus (Deshayes, 1830) Discus rotundatus (Müller, 1774) * Discus whitneyi (Newcomb, 1864)
Helicodiscidae
	Helicodiscus parallelus (Say, 1817) Helicodiscus shimeki Hubricht, 1962 Lucilla singleyana (Pilsbry, 1889)
Punctidae
	Punctum minutissimum (I. Lea, 1841) Punctum vitreum (H.B. Baker, 1930)
Arionidae
	Arion circumscriptus Johnston, 1828 * Arion distinctus Mabille, 1868 * Arion hortensis Férussac, 1819 * Arion intermedius (Normand, 1852) * Arion subfuscus (Draparnaud, 1805) *
Philomycidae
	Megapallifera mutabilis (Hubricht, 1951) Pallifera dorsalis (A. Binney, 1842) Pallifera ohioensis (Sterki, 1908) Pallifera secreta (Cockerell, 1900) Philomycus carolinianus (Bosc, 1802) Philomycus flexuolaris Rafinesque, 1820 Philomycus togatus (Gould, 1841)
Testacellidae
	Testacella haliotidea Draparnaud, 1801 *
Ferussaciidae
	Cecilioides acicula (Müller, 1774) *
Haplotrematidae
	Haplotrema concavum (Say, 1821)
Helicarionidae
	Euconulus dentatus (Sterki, 1893) Euconulus fulvus (Müller, 1774) Euconulus polygyratus (Pilsbry, 1899) Guppya sterkii (Dall, 1888)
Gastrodontidae
	Gastrodonta interna (Say, 1822) Striatura exigua (Stimpson, 1850) Striatura ferrea E.S. Morse, 1864 Striatura meridionalis (Pilsbry and Ferriss, 1906) Striatura milium (E.S. Morse, 1859) Ventridens demissus (A. Binney, 1843) Ventridens gularis (Say, 1822) Ventridens intertextus (A. Binney, 1841) Ventridens ligera (Say, 1821) Ventridens suppressus (Say, 1829) Ventridens virginicus (Vanatta, 1936) Zonitoides arboreus (Say, 1816) Zonitoides nitidus (Müller, 1774)
Zonitidae
	Glyphyalinia indentata (Say, 1823) Glyphyalinia rhoadsi (Pilsbry, 1899) Glyphyalinia wheatleyi (Bland, 1883) Mesomphix cupreus (Rafinesque, 1831) Mesomphix inornatus (Say, 1821) Mesomphix perlaevis (Pilsbry, 1900) Nesovitrea binneyana (E.S. Morse, 1864) Nesovitrea electrina (Gould, 1841) Oxychilus cellarius (Müller, 1774) * Paravitrea multidentata (A. Binney, 1840)
Vitrinidae
	Hawaiia alachuana (Dall, 1885) Hawaiia minuscula (A. Binney, 1841) Vitrina angelicae Beck, 1837
Limacidae
	Lehmannia valentiana (Férussac, 1821) * Limax maximus Linné, 1758 *
Agriolimacidae
	Deroceras laeve (Müller, 1774) Deroceras reticulatum (Müller, 1774) *
Milacidae
	Milax gagates (Draparnaud, 1801) *
Polygyridae
	Allogona profunda (Say, 1821) Appalachina sayana (Pilsbry, 1906) Euchemotrema fraternum (Say, 1824) Euchemotrema leai (A. Binney, 1841) Inflectarius inflecta (Say, 1821) Mesodon clausus (Say, 1821) Mesodon elevatus (Say, 1821) Mesodon mitchellianus (I. Lea, 1839) Mesodon thyroidus (Say, 1816) Mesodon zaletus (A. Binney, 1837) Neohelix albolabris (Say, 1817) Neohelix dentifera (A. Binney, 1837) Patera laevior (Pilsbry, 1940) Patera pennsylvanica (Green, 1827) Stenotrema barbatum (G.H. Clapp, 1904) Stenotrema edvardsi (Bland, 1856) Stenotrema hirsutum (Say, 1817) Triodopsis fallax (Say, 1825) Triodopsis fraudulenta (Pilsbry, 1894) Triodopsis juxtidens (Pilsbry, 1894) Triodopsis picea Hubricht, 1958 Triodopsis tridentata (Say, 1816) Triodopsis vulgata Pilsbry, 1940 Webbhelix multilineata (Say, 1821) Xolotrema denotatum (Férussac, 1821)