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Lanistes is a genus of freshwater snails which have a gill and an operculum, aquatic gastropod mollusks in the family Ampullariidae, the apple snails. [7]


Contents 1 Distribution 2 Description 3 Species 4 References 5 External links


Distribution[]

The distribution of the genus Lanistes includes Africa and Madagascar.[3]

Description[]

Lanistes has a unique anatomy among the Ampullariidae: it has a "hyperstrophic" sinistral shell.[8] This means that the body of the snail is dextral (as in all other ampullariids), but the shell appears to be sinistral.[8] However the sinistral appearance stems from the fact that the rotation of the shell as it grows is in an upward direction rather than the usual downward direction.[8]

Species[]

Three[3] subgenera have been recognized, based on shell differences: Lanistes sensu stricto, Meladomus and Leroya. These subgenera are not used in recent works.[3]

Extant species within the genus Lanistes include: Lanistes alexandri (Bourguignat, 1889)[3] Lanistes ambiguus Martens, 1866 Lanistes bernardianus (Morelet, 1860) Lanistes beseneckeri Schütt in Schütt & Besenecker, 1973 † Lanistes bicarinatus Germain, 1907[3] Lanistes bloyeti (Bourguignat, 1889) Lanistes carinatus (Olivier, 1804) Lanistes chaperi (Kobelt, 1912) Lanistes carinatus (Olivier, 1804) - type species[2][3] Lanistes ciliatus Martens, 1878[2][3] Lanistes congicus O. Boettger, 1891[2][3] Lanistes deguerryanus (Bourguignat, 1889) Lanistes ellipticus Martens, 1866[2][3] Lanistes farleri Craven, 1880[2][3] Lanistes fultoni (Kobelt, 1912) Lanistes grasseti (Morelet, 1863)[3] Lanistes graueri Thiele, 1911[2][3] Lanistes intortus Martens, 1877[2][3] Lanistes jouberti (Bourguignat, 1888) Lanistes letourneuxi (Bourguignat, 1879) Lanistes libycus (Morelet, 1848)[2][3] Lanistes libycus var. albersi Lanistes libycus form bernardianus[3] or as Lanistes bernardianus (Morelet, 1860)[2]

Lanistes magnus Furtado, 1886 Lanistes nasutus Mandahl-Barth, 1972[2][3] Lanistes neavei Melvill & Standen, 1907[2][3] Lanistes neritoides Brown & Berthold, 1990[2][3] Lanistes nitidissimus (Bourguignat, 1889) Lanistes nsendweensis (Dupuis & Putzeys, 1901)[3] Lanistes nyassanus Dohrn, 1865[3] Lanistes ovatus (Olivier, 1804) Lanistes ovum Peters in Troschel, 1845[3] - synonyms: Lanistes magnus Furtado; Lanistes olivaceus (Sowerby); Lanistes procerus; Lanistes elatior Martens, 1866; Lanistes ovum bangweolicus Haas, 1936; Lanistes connollyi Pain, 1954[3] Lanistes ovum adansoni;[citation needed] Lanistes olivaceus var. ambiguus[citation needed] Lanistes palustris (Morelet, 1864) Lanistes pfeifferi (Bourguignat, 1879) Lanistes pilsbryi Walker, 1925 Lanistes pseudoceratodes (Wenz, 1928)[2] Lanistes purpureus (Jonas, 1839)[2][3] Lanistes solidus Smith, 1877[2][3] Lanistes stuhlmanni Martens, 1897[2][3] Lanistes varicus (Müller, 1774) - synonyms: Lanistes adansoni Kobelt, 1911; Lanistes millestriatus Pilsbry & Bequaert, 1927[3]

Fossil species within the genus Lanistes include: † Lanistes asellus van Damme & Pickford, 1995[4] † Lanistes bishopi Gautier[4] † Lanistes gautieri van Damme & Pickford, 1995[4] † Lanistes gigas van Damme & Pickford, 1995[4] † Lanistes hadotoi van Damme & Pickford, 1995[4] † Lanistes heynderycxi van Damme & Pickford, 1995[4] † Lanistes nkondoensis van Damme & Pickford, 1995[4] † Lanistes olukaensis[4] † Lanistes senuti van Damme & Pickford, 1995[4] † Lanistes trochiformis van Damme & Pickford, 1995[4]

References[]

1.Jump up ^ Montfort P. D. de (1810). Conch. Syst. 2: 122. 2.^ Jump up to: a b c d e f g h i j k l m n o p q "Lanistes". The apple snail website, accessed 16 May 2011. 3.^ Jump up to: a b c d e f g h i j k l m n o p q r s t u v w x y z aa Brown D. S. (1994). Freshwater Snails of Africa and their Medical Importance. Taylor & Francis. ISBN 0-7484-0026-5. 4.^ Jump up to: a b c d e f g h i j k van Damme D. & Pickford M. (1995). "The late Cenozoic ampullariidae (mollusca, gastropoda) of the Albertine Rift Valley (Uganda-Zaire)". Hydrobiologia 316(1): 1-32. doi:10.1007/BF00019372. 5.Jump up ^ Grandidier (1887). Bull. Soc. malac. France 4: 191. 6.Jump up ^ Swainson (1840). Treat. Malacol., page 340. 7.Jump up ^ Bouchet, P.; Neubauer, Thomas A. (2015). Lanistes Montfort, 1810. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=820447 on 2015-11-11 8.^ Jump up to: a b c "Shell". The apple snail website, accessed 16 May 2011.

External links[]

"Lanistes". National Center for Biotechnology Information (NCBI). Animation showing how the "hyperstrophic" sinistral shell evolved from a shell with normal orientation Schultheiß R., Van Bocxlaer B., Wilke T. & Albrecht C. (2009). "Old fossils–young species: evolutionary history of an endemic gastropod assemblage in Lake Malawi". Proceedings of the Royal Society B 276(1668): 2837-2846. doi:10.1098/rspb.2009.0467.

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