Reverse Coiled Gastropods

Land & Freshwater Gastropods

Although not as well-publicized as their marine gastropod relatives, the shells of certain few snail species inhabiting the land and fresh waters are known to occur in the abnormally-reversed-coiled condition. Actually, the number of species and individual specimens with reversed symmetry appears to be greater among this group (with terrestrial pulmonate shells accounting for the lion's share) than among seashells - rather surprising considering that far fewer species and individuals of nonmarine than of marine shells have come to our attention.

Aquatic Prosobranchs

Ampullariidae Pila ampullacea (Linnaeus, 1758) 5.86 Cavite, Luzon, Philippines. (1994). More on sinistral Ampullariidae
Ampullariidae Pila globosa (Swainson, 1821) 3.41 Jelatura, Sri Lanka. 1981.
Ampullariidae Pomacea cf. canaliculata (Lamarck, 1822) 5.05 Nha Trang, Vietnam (non-native). 2010.
Viviparidae Campeloma decisum (Say, 1817) 31.0 Des Plaines R., Illinois, USA. (1986).
Viviparidae Campeloma lima (Anthony, 1860) 2.58 Doctortown, Georgia, USA. 1974.
Viviparidae Idiopoma dissimilis (Müller, 1774) 1.00 India (2014).
Viviparidae Viviparus contectus (Millet, 1813) 1.83 Overrijssel, Zwartsluis, Zwartewater, Netherlands. (2003).
Nassariidae Nassodonta dorri (Wattebled, 1886) 1.31 Pthan Ri, Vietnam. 2005.

Aquatic Pulmonates

Lymnaeidae Lymnaea stagnalis (Linnaeus, 1758) 2.7 Paks, Danubevally, Hungary. 1983.
Physidae Physella heterostropha (Say, 1817) 0.5 Jumper Creek, Sumter Co., Florida, USA. 2010. (species is predominantly sinistral)

Terrestrial Prosobranchs

Diplommatinidae Palaina taeniolata hyalina Quadras and Möllendorff, 1894 0.23 Agana, Guam. (1986). (species is normally sinistral) +
Pupinidae Coptocheilus altus sibuyanensis (Bartsch, 1915) 2.55 Sibuyan Is. Philippines. 1940. (species is normally dextral)

Terrestrial Pulmonates

Acavidae Acavus phoenix (L. Pfeiffer, 1854) 5.51 Horana, Sri Lanka. (1988).
Acavidae Acavus haemastoma (Linnaeus, 1758) 3.98 Galle, Sri Lanka. 1988.
Achatinidae Lissachatina fulica (Bowdich, 1822) 8.07 Madagascar. (1988). +
Achatinidae Lissachatina immaculata (Lamarck, 1822) 8.78 Curepipe, Mauritius. (1973).
Achatinidae Cochlitoma zebra (Bruguière, 1792) 6.50 near Jeffreys Bay, South Africa. (2006).
Achatinidae Archachatina ventricosa (Gould, 1850) 7.45 Grand Bassam, Ivory Coast. (1995).
Clausiliidae Alinda biplicata (Montagu, 1803) 1.40 Budapest, Hungary. 1983. (species is normally sinistral)
Clausiliidae Cochlodina laminata (Montagu, 1803) 1.60 Oxon, England. (1971). (species is normally sinistral)
Clausiliidae Leucostigma candidescens (Rossmässler, 1836) 1.90 Avezzanno, Abruzzi Prov., Italy 2001. (species is normally sinistral)
Clausiliidae Phaedusa paviei (Morlet, 1892) 2.35 near Sa Pa, Vietnam 2010. (species is normally sinistral)
Ariophantidae Elaphroconcha javacensis (Férussac, 1821) 2.10 Tupang, Java. 2000.
Bradybaenidae Bradybaena similaris (Férussac, 1821) 1.11 Laboratory strain, Matsumoto, Japan. (2008).
Bradybaenidae Calocochlia pan (Broderip, 1841) 4.00 Bohol, Philippines. (2009). +
Bradybaenidae Chrysallis aspersa (Grateloup, 1839) 6.00 Mindoro, Philippines. (2009).
Bradybaenidae Cochlostyla daphnis (Broderip, 1841) 4.55 Cebu, Philippines. 1999.
Bradybaenidae Cochlostyla pithogaster (Férussac, 1821) 5.05 Luzon, Philippines. (1997).
Bradybaenidae Cochlostyla rufogaster (Lesson, 1831) 5.24 Marinduque, Philippines. 2004.
Bradybaenidae Helicostyla effusa (L. Pfeiffer, 1842) 4.82 Batangas, Philippines. (1999).
Bulimulidae Bulimulus guadalupensis (Bruguière, 1789) 1.68 Miami-Dade County, Florida, USA. 2021.
Bulimulidae Corona perversa (Swainson, 1820) 5.75 Serra de Navio, Amapá, Brazil. 2002. (species is normally sinistral)
Bulimulidae Corona regalis (Hupé, 1857) 6.98 Meruri, Mato Grosso, Brazil. 1980. (species is normally sinistral)
Bulimulidae Liguus fasciatus (Müller, 1774) Pincrest Hammock no. 1, Florida, USA. 1940.
Bulimulidae Liguus virgineus (Linnaeus, 1758) 3.70 Haiti. (1975).
Bulimulidae Rabdotus mooreanus (L. Pfeiffer, 1868) 2.16 Ft. Worth, Texas, USA. 1977.
Bulimulidae Thaumastus largillierti (Philippi, 1848) 5.57 Arraial do Cabo, Brazil. 2001.
Camaenidae Amphidromus chloris (Reeve, 1848) 3.70 Philippines. (1986). (species is normally sinistral)
Camaenidae Amphidromus latestrigatus Schepman, 1892 3.60 small island near Sawu Island, East Indonesia. (2006). (species is normally sinistral)
Camaenidae Caracolus marginella (Gmelin, 1791) 3.94 Wainwright Hammock, Miami, Florida, USA. 2000.
Camaenidae Obba moricandi (L. Pfeiffer, 1842) 2.68 Samar, Philippines. (1995).
Camaenidae Steorra mazee (Brazier, 1878) 3.95 Townsville, Australia. 1999.
Discidae Anguispira alternata (Say, 1817) 2.02 Medina, Michigan, USA. 1941.
Discidae Anguispira strongylodes (L. Pfeiffer, 1854) 1.40 Marianna, Florida, USA. 1990.
Helicarionidae Ryssota otaheitana (Férussac, 1821) 7.63 Bohol, Philippines. (1997).
Zonitidae Ventridens cerinoideus (Anthony, 1865) 0.62 Jacksonville, Florida, USA. 2005.
Helicidae Cepaea nemoralis (Linnaeus, 1758) 2.05 Bunderand, N. Ireland. 1899.
Helicidae Cornu aspersum (Müller, 1774) 2.76 Newark, England. 1978.
Helicidae Eobania vermiculata (Müller, 1774) 3.56 Languedoc, France. (1991).
Helicidae Helix lucorum Linnaeus, 1758 4.62 Southern Greece. (1993).
Helicidae Helix pomatia Linnaeus, 1758 4.26 Geneva, Switzerland. (1974).
Helicidae Otala punctata (Müller, 1774) 4.09 Tarragona, Spain. (2000).
Megalobulimidae Megalobulimus gummatus (Hidalgo, 1870) 11.18 Arraial do Cabo, Brazil. 2001.
Partulidae Partula rosea Broderip, 1832 1.80 Huahine, Society Islands. (1988).
Polygyridae Allogona profunda (Say, 1821) 2.77 Columbus, Ohio, USA. Circa. 1850.
Polygyridae Daedalochila avara (Say, 1818) 0.66 Jacksonville, Florida, USA. 1975.
Polygyridae Polygyra cereolus (Mühlfeld, 1818) 0.70 Hastings, Florida, USA. 2011.
Polygyridae Polygyra septemvolva Say, 1818 0.73 Levy Co., Florida, USA. 2005.
Polygyridae Praticolella species 0.50 El Limon, Mexico. 1989.
Polygyridae Triodopsis vulgata Pilsbry, 1940 1.28 Bardstown, Kentucky, USA. 2014.
Polygyridae Xolotrema fosteri (F. C. Baker, 1921) 1.53 St. Louis, Missouri, USA. 1969.
Vertiginidae Vertigo rugosula Sterki, 1890 0.22 Jacksonville, Florida, USA. 1975.
Cerionidae Cerion incanum (A. Binney, 1851) 1.87 Monroe Co., Florida, USA. 1999.
Cerionidae Cerion tridentatum costellatum Pilsbry, 1946 3.23 Delray Beach, Florida. 2011.
Spiraxidae Euglandina liebmanni (L. Pfeiffer, 1846) 2.95 Guerrero, Mexico. (1992).

Webmaster's Reverse Coiled Marine Gastropods	Additional Sinistral Species	Sinistral Marginellidae (Alboran Shells)