Contents 1 Description 2 Taxonomy 3 Life cycle 4 Distribution 5 Ecology 5.1 Parasites 6 Behavior 7 Human relevance 7.1 Approaches to snail pest control 7.2 Pharmacological studies 8 References 9 Further reading 10 External links

Description[edit] Cornu aspersum in warm regions commonly emerges in moist weather in winter. Sinistral form (exceptional) and dextral form (common) MHNT The adult bears a hard, thin calcareous shell 25–40 mm in diameter and 25–35 mm high, with four or five whorls. The shell is variable in coloring and shade of color, but generally it has a reticulated pattern of dark brown, brownish-golden, or chestnut with yellow stripes, flecks, or streaks (characteristically interrupted brown colour bands). The aperture is large and characteristically oblique, its margin in adults is whitish and reflected. The body is soft and slimy, brownish-grey, and the animal retracts itself entirely into the shell when inactive or threatened. When injured or badly irritated the animal produces a defensive froth of mucus that might repel some enemies or overwhelm aggressive small ants or the like. It has no operculum; during dry or cold weather it seals the aperture of the shell with a thin membrane of dried mucus; the term for such a membrane is epiphragm. The epiphragm helps the snail retain moisture and protects it from small predators such as some ants. The snail's quiescent periods during heat and drought are known as aestivation; its quiescence during winter is known as overwintering. When overwintering, Cornu aspersum avoids the formation of ice in its tissues by altering the osmotic components of its blood (or haemolymph); this permits it to survive temperatures as low as -5 °C (23 °F).[3] During aestivation, the mantle collar has the ability to change its permeability to water.[4] The snail also has an osmoregulatory mechanism that prevents excessive absorption of water during hibernation. These mechanisms allow Cornu aspersum to avoid either fatal desiccation or hydration during months of either kind of quiescence. During times of activity the snail's head and "foot" or "belly" emerge. The head bears four tentacles; the upper two are larger and bear eye-like light sensors, and the lower two are tactile and olfactory sense organs. The snail extends the tentacles by internal pressure of body fluids, and retracts all four tentacles into the head by invagination when threatened or otherwise retreating into its shell. The mouth is located beneath the tentacles, and contains a chitinous radula with which the snail scrapes and manipulates food particles. The shell of Cornu aspersum is almost always right-coiled, but exceptional left-coiled specimens are also known, see Jeremy (snail) for an example.

Taxonomy[edit] Between 1774 and 1988 all authorities accepted the species as Helix aspersa, a member of the genus Helix. However, in a number of publications since 1990,[5] it has been placed in the same genus as the species known as H. aperta and, on the accepted interpretation of the ICZN Code's Article 1.3.2 on the Cornu problem, in Cornu.[6][7] For those who regard Cornu as appropriate, the name can be Cornu aspersum if they prefer not to classify it in Helix.[8][9][10] Those who prefer neither Cornu nor Helix, fall into two camps; if they classify Helix aperta in the same genus as Helix aspersa, as was done by Italian research teams and others,[11] then they assign this species to Cantareus aspersus;[12][13][14] Other workers, such Ukrainian and Russian research teams who regard the two species as being in different genera, call it Cryptomphalus aspersus.[15][16][17][18] The matter still is subject to resolution.

Life cycle[edit] Mating Cornu aspersum. Eggs of Cornu aspersum Like other Pulmonata, the individuals of the species Cornu aspersum are hermaphrodites, producing both male and female gametes. Reproduction is usually sexual, although self-fertilisation sometimes occurs.[19] During a mating session of several hours, two snails exchange sperm. Cornu aspersum is one of the species that uses love darts during mating. About two weeks after fertilisation, the snail lays a batch of about 80 spherical pearly-white eggs into crevices in the topsoil, or sheltered under stones or the like. In a year it may lay approximately six batches of eggs.[20] The size of the egg is 4 mm.[21] The young snails take one to two years to reach maturity.[22] In some regions snail farms produce these snails commercially.

Distribution[edit] A hibernaculum on a doocot in Eglinton, Scotland Cornu aspersum is native to the Mediterranean region (including Egypt[23]) and Western Europe, from northwest Africa and Iberia, eastwards to Asia Minor, and northwards to the British Isles. Cornu on a white mulberry leaf in Johannesburg, South Africa About the beginning of the 20th century, a number of North African endemic forms and subspecies were described on the basis of shell characteristics. The commonest subspecies, Cornu aspersum aspersum (synonym Helix aspersa aspersa), has become very abundant, mainly in agricultural and residential human habitats where the climates is temperate, Mediterranean, or subtropical.[24] Cornu aspersum is a typically anthropochorous species; it has been spread to many geographical regions by humans, either deliberately or accidentally. Nowadays it is cosmopolitan in temperate zones, and has become naturalised in many regions with climates that differ from the Mediterranean climate in which it evolved.[22][25] It is present on all continents except Antarctica, and occurs on most major islands as well. Its passive anthropochory is the likeliest explanation for genetic resemblances between allopatric populations. Its anthropochorous spread may have started as early as during the Neolithic revolution some 8500 BP. Such anthropochory continues, sometimes resulting in locally catastrophic destruction of habitat or crops.[24] Its increasing non-native distribution includes other parts of Europe, such as Bohemia in the Czech Republic since 2008.[26] It is present in Australia, New Zealand, North America and southern South America.[27] It was introduced to Southern Africa as a food animal by Huguenots in the 18th century, and into California as a food animal in the 1850s; it is now a notorious agricultural pest in both regions, especially in citrus groves and vineyards. Many jurisdictions have quarantines for preventing the importation of the snail in plant matter.[28]

Ecology[edit] Hundreds of Cornu aspersum on a wall Female glowworm beetle, Lampyris noctiluca, family Lampyridae, feeding on a specimen of Cornu aspersum that it has killed with its venomous bite. C. aspersum shell cemetery. Individuals failing to overwinter in Scotland. Cornu aspersum is a primarily a herbivore with a wide range of host plants. It feeds on numerous types of fruit trees, vegetable crops, rose bushes, garden flowers, and cereals. It also is an omnivorous scavenger that feeds on rotting plant material and on occasion will scavenge animal matter, such as crushed snails and worms. In turn it is a food source for many other animals, including small mammals, many bird species, lizards, frogs, centipedes, predatory insects such as glowworms in the family Lampyridae, and predatory terrestrial snails.[29] The species may on occasion be of use as an indicator of environmental pollution, because it deposits heavy metals, such as lead in its shell.[30] Parasites[edit] Parasites of Cornu aspersum include the nematode Nemhelix bakeri (family Cosmocercidae).[31][32]

Behavior[edit] Cornu aspersum leaving mucus-conserving trail over dry brick. The belly visibly leaves the ground in two places in a wave motion without dragging. That wave motion is independent of the wave of muscular contraction that drives the locomotion. Snail climbing grass SMC 07 Cornu aspersum leaving mucus-conserving trail, as seen from above. Snails crossing a razor.[33] The snail secretes thixotropic adhesive mucus that permits locomotion by rhythmic waves of contraction passing forward within its muscular "foot". Starting from the rear, the contraction of the longitudinal muscle fibres above a small area of the film of mucus causes shear that liquefies the mucus, permitting the tip of the tail to move forward. The contracted muscle relaxes while its immediately anteriad transverse band of longitudinal fibres contract in their turn, repeating the process, which continues forward until it reaches the head. At that point the whole animal has moved forward by the length of the contraction of one of the bands of contraction. However, depending on the length of the animal, several bands of contraction can be in progress simultaneously, so that the resultant speed amounts to the speed imparted by a single wave, multiplied by the number of individual waves passing along simultaneously.[34] A separate type of wave motion that may be visible from the side enables the snail to conserve mucus when moving over a dry surface. It lifts its belly skin clear of the ground in arches, contacting only one to two thirds of the area it passes over. With suitable lighting the lifting may be seen from the side as illustrated, and the percentage of saving of mucus may be estimated from the area of wet mucus trail dabs that it leaves behind. This type of wave passes backwards at the speed of the snail's forward motion, therefore having a zero velocity with respect to the ground. The snail moves at a top speed of 1.3 centimetres per second[35] (47 meters per hour or ~50 yards per hour),[36] and has a strong homing instinct, readily returning to a regular hibernation site.[37] In spite of its apparent slowness and limitations, the snail exploits the special nature of its mucus to achieve some startling feats. It can go up a slope at any angle, including upside down, resist being pulled off a firm surface with an adhesive strength several times its own weight, rest on a surface at any angle without any expenditure of energy, or, notoriously, climb a needle-like stem or pass over the edge of razor blade without harm, relying on the firmness of its mucus film in its shear-resistant phase.[33]

Human relevance[edit] Spanish dish, Caracoles-Cascorro, ready to serve. Play media A garden snail climbing a window in Israel during a winter night.[38] The species is known as an agricultural and garden pest, an edible delicacy, and occasionally a household pet. In French cuisine, it is known as petit gris, and is served for instance in Escargot a la Bordelaise. Also in Lleida, a city of Catalonia, there is a gastronomic festival called L’Aplec del Caragol dedicated to this type of snail, known as bover, and attracts over 200,000 guests every year. From Crete are known a dish called "chochloi mpoumpouristoi"(snails turned upside down), the snails cooked alive in a hot pan, on a thick layer of sea salt. Other dishes with snails are snails with rosemary, etc. The practice of rearing snails for food is known as heliciculture. For purposes of cultivation, the snails are kept in a dark place in a wired cage with dry straw or dry wood. Coppiced wine-grape vines are often used for this purpose. During the rainy period the snails come out of hibernation and release most of their mucus onto the dry wood/straw. The snails are then prepared for cooking. Their texture when cooked is slightly chewy. Approaches to snail pest control[edit] There are a variety of snail-control measures that gardeners and farmers use in an attempt to reduce damage to valuable plants. Traditional pesticides are still used, as are many less toxic control options such as concentrated garlic or wormwood solutions. Copper metal is also a snail repellent, and thus a copper band around the trunk of a tree will prevent snails from climbing up and reaching the foliage and fruit. Caffeine has proven surprisingly toxic to snails, to the extent that spent coffee grounds (genuine coffee, and not decaffeinated) make a safe and immediately effective snail-repellant and even molluscicidal mulch for pot-plants, or for wherever else the supply is adequate. Garden snails can be easily controlled and trapped with a simple trap created by cutting a plastic bottle in half and burying the bottom half so the top is level with the soil, then partially filling the bottle bottom with any variety of beer. Snails are attracted to the carbohydrates and yeast in beer, and crawl into the trap and drown. This method requires that the trap be checked every day and dead snails removed and the trap refilled with beer as it evaporates over time. Traps should be spaced every three to four meters from one another for coverage of a large garden.[39][40][41] The decollate snail (Rumina decollata) will capture and eat garden snails, and because of this it has sometimes been introduced as a biological pest control agent. However, this is not without problems, as the decollate snail is just as likely to attack and devour other species of gastropods that may represent a valuable part of the native fauna of the region. Pharmacological studies[edit] Recently, Cornu aspersum has gained some popularity as the chief ingredient in skin creams and gels (crema/gel de caracol) sold in the USA. These creams are promoted as being suitable for use on wrinkles, scars, dry skin, and acne. A screen of the secretions that the Cornu aspersum snail produces under stress, to find if it possesses pharmacological properties, has yielded skin-regenerative properties. Some of the cellular and molecular effects underlying this observation are: the secretions contain antioxidant Superoxide dismutase and Glutathione S-transferase (GSTs) activities. In addition, the secretions stimulate fibroblast proliferation and rearrangement of the actin cytoskeleton. Additional mechanisms involved in the regenerative effect of the snail secretions include the stimulation of extracellular matrix assembly and the regulation of metalloproteinase activities. Together, these effects provide an array of molecular mechanisms underlying the secretions’ induced cellular regeneration and postulate its use in regeneration of wounded tissue.[42]

References[edit] This article incorporates CC-BY-2.0 text from reference.[24] ^ IUCN (2008). 2008 IUCN Red List of Threatened Species. <>. Downloaded on 23 February 2009. ^ Müller O. F. (1774). Vermivm terrestrium et fluviatilium, seu animalium infusoriorum, helminthicorum, et testaceorum, non marinorum, succincta historia. Volumen alterum. pp. I-XXVI [= 1-36], 1-214, [1-10]. Havniae & Lipsiae. (Heineck & Faber). ^ Ansart, A.; Vernon, P.; Daguzan, J. (2002). "Elements of cold hardiness in a littoral population of the land snail Cornu aspersum (Gastropoda: Pulmonata)". Journal of Comparative Physiology B. 172: 619–625.  ^ Machin, J (1966). "The evaporation of water from Cornu aspersum IV. Loss from the mantle of the inactive snail". Journal of Experimental Biology. 45: 269–278.  ^ The species was called Cryptomphalus aspersus on p. 244 in the important and widely distributed work Falkner, G. 1990. Binnenmollusken. - pp. 112-280, in: Fechter, R, & Falkner, G.: Weichtiere. Europäische Meeres- und Binnenmollusken. Steinbachs Naturführer 10. -- pp. 1-288. München. (Mosaik). ^ "The Cornu problem". The Living World of Mollusks. Retrieved 2007-03-05.  ^ AnimalBase: Genus taxon summary for Cornu (accessed 09 Feb 2011) ^ Falkner, G., Bank, R. A. & Proschwitz, T. von 2001. Check-list of the non-marine molluscan species-group taxa of the states of northern, Atlantic and central Europe. Heldia 4 (1/2): 1-76. München. ^ Falkner, G., Ripken, T. E. J. & Falkner, M. 2002. Mollusques continentaux de France. Liste de référence annotée et bibliographie. - pp. [1-2], 1-350, [1-3]. Paris. ^ Bank, R.; Falkner, G.; Proschwitz, T. von (2007). "CLECOM-Project. A revised checklist of the non-marine Mollusca of Britain and Ireland". Heldia. 5 (3): 41–72.  ^ Manganelli, G., Bodon, M., Favilli, L. & Giusti, F. 1995. Fascicolo 16. Gastropoda Pulmonata. - pp. 1-60, in: Minelli A., Ruffo, S. & La Posta, S.: Checklist delle specie della fauna italiana. Bologna. (Calderini). ^ Giusti, F., Manganelli, G. & Schembri, P. J. 1995. The non-marine molluscs of the Maltese Islands. - pp. 1-608. Torino. ^ Neubert, E (1998). "Annotated checklist of the terrestrial and freshwater molluscs of the Arabian Peninsula with descriptions of new species". Fauna of Arabia. 17: 333–461.  ^ Manganelli, G.; Salomone, N.; Giusti, F. (2005). "A molecular approach to the phylogenetic relationships of the western palaearctic Helicoidea (Gastropoda: Stylommatophora)". Biological Journal of the Linnean Society. 85: 501–512. doi:10.1111/j.1095-8312.2005.00514.x.  ^ Sverlova, N. V. (2006). "O rasprostranenii nekotorɨkh vidov nazemnɨkh mollyuskov na territorii Ukrainɨ". Ruthenica. 16 (1/2): 119–139.  ^ Schileyko, A. A. (2006). "Treatise on recent terrestrial pulmonate molluscs, Part 13. Helicidae, Pleurodontidae, Polygyridae, Ammonitellidae, Oreohelicidae, Thysanophoridae". Ruthenica. 2 (10): 1765–1906.  ^ Egorov, R. 2008. Treasure of Russian shells. Supplement 5. Illustrated catalogue of the recent terrestrial molluscs of Russia and adjacent regions. - pp. 1-179, [1]. Moscow. ^ Sysoev, A. & Schileyko, A. 2009. Land snails and slugs of Russia and adjacent countries. - pp. 1-312, Fig. 1-142. Sofia. (Pensoft). ^ Cowie, R. H. (1984). "The life-cycle and productivity of the land snail Theba pisana (Mollusca: Helicidae)". The Journal of Animal Ecology. 53: 311–325. doi:10.2307/4359.  ^ Bezemer, T. M.; Knight, K. J. (2001). "Unpredictable responses of garden snail Helix aspersa populations to climate change". Acta Oecologica. 22: 201–208. doi:10.1016/s1146-609x(01)01116-x.  ^ Heller J.: Life History Strategies. in Barker G. M. (ed.): The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, 2001, ISBN 0-85199-318-4. 1-146, cited page: 428. ^ a b Arkive: Helix aspersa ^ Commonwealth of Australia. 2002 (April) Citrus Imports from the Arab Republic of Egypt. A Review Under Existing Import Conditions for Citrus from Israel Archived 2009-01-09 at the Wayback Machine.. Agriculture, Fisheries and Forestry, Australia. Caption: Gastropods, page 12 and Appendix 2. ^ a b c Annie Guiller, A.; Madec, L. (2010). "Historical biogeography of the land snail Cornu aspersum: a new scenario inferred from haplotype distribution in the Western Mediterranean basin:". BMC Evolutionary Biology. 10: 18. doi:10.1186/1471-2148-10-18.  ^ Pfleger, V. & Chatfield, J. (1983). A guide to snails of Britain and Europe. Hamlyn, London. ^ Juřičková L. & Kapounek F. (18 November 2009) "Helix (Cornu) aspersa (O.F. Müller, 1774) (Gastropoda: Helicidae) in the Czech Republic". Malacologica Bohemoslovaca 8: 53-55. PDF. ^ UF/IFAS Featured Creatures: Helix aspersa ^ USDA grazing systems and alternative livestock breeds ^ Fisher, TW; Orth, RE; Swanson, SC (1980). "Snail against snail". California Agriculture. 34 (11): 18–20.  ^ Beeby, A.; Richmond, L. (1989). "The shell as a site of lead deposition in Cornu aspersum". Archives of Environmental Contamination and Toxicology. 18: 623–628. doi:10.1007/bf01055031.  ^ (in French) Morand S. & Petter A. J. (1986). "Nemhelix bakeri n.gen., n.sp. (Nematoda: Cosmocercinae) parasite de l'appareil génital de Helix aspersa (Gastropoda: Helicidae) en France". Canadian Journal of Zoology 64(9): 2008-2011. doi:10.1139/z86-303. ^ (in French) Morand S. (1988). "Cycle évolutif du Nemhelix bakeri Morand et Petter (Nematoda, Cosmocercidae), parasite de l'appareil génital de l'Helix aspersa Müller (Gastropoda, Helicidae)". Canadian Journal of Zoology 66(8): 1796-1802. doi:10.1139/z88-260. ^ a b Bonnier Corporation (July 1919). Popular Science. Bonnier Corporation. pp. 42–. ISSN 0161-7370.  ^ Chan, Brian; Balmforth, N. J.; Hosoi, A. E. (2005). "Building a better snail: Lubrication and adhesive locomotion". Phys. Fluids. 17: 113101. doi:10.1063/1.2102927.  ^ Speed of a Snail Archived 2012-04-21 at WebCite ^ Velocity Measurement Units Conversion ^ Attia, J (2004). "Behavioural Rhythms of Land Snails in the Field". Biological Rhythm Research. 35: 35–41. doi:10.1080/09291010412331313223.  ^ Original film in YouTube, 29 November 2014. ^ [1], Use Beer to Get Rid of Snails in Your Garden ^ [2], Slug Trap From Recycled Water Bottles ^ [3], Make a Slig Trap Out of a Used Plastic Bottle ^ [4] Skin Pharmacology and Physiology. Vol. 21 ISSN 1660-5527. Molecular basis for the regenerative properties of a secretion of the mollusk Cryptomphalus aspersa. January 2008.

Further reading[edit] Comment on Cornu Born, 1778 (Mollusca, Gastropoda, Pulmonata, HELICIDAE):request for a ruling on the availability of the generic name (Case 3518; see BZN 68: 97–104, 282–292; 69: 124–127, 219–221); Bulletin of Zoological Nomenclature 70(1) March 2013

External links[edit] Wikimedia Commons has media related to Cornu aspersum. Helix aspersa at Animalbase taxonomy, short description, distribution, biology, status (threats), images Helix aspersa images at Encyclopedia of Life including genitalia drawings brown garden snail on the UF / IFAS Featured Creatures website Canada Agriculture Fact Sheet BBC Info Page Pesticides Database - Chemical Toxicity Studies[permanent dead link] Extreme Close-Up Video of the North American Garden Snail University of California Pest Management Guidelines: Brown Garden Snail Video of froth protection response of Cornu aspersum Zachi Evenor, A video showing a garden snail (Cornu aspersum / Helix aspersa) in action, YouTube, November 9, 2013 v t e Edible mollusks Bivalves Clams Atlantic jackknife Atlantic surf Geoduck Grooved carpet shell Hard clam Horse Mactra stultorum Blunt gaper Ocean quahog Pacific razor Venus California butterclam Senilia senilis Smooth clam Soft-shell Triangle shell Tuatua Japanese littleneck Razor clam Pod razor Ensis (razor genus) Paphies Cockles Common Blood Goolwa New Zealand Sydney Mussels Blue Mediterranean New Zealand green-lipped California Brown Asian/Philippine green Date Mytilidae (mussel family) Oysters Auckland Eastern Olympia Southern mud Colchester native Pacific Portuguese Windowpane Rock Sydney rock Ostra chilena/Bluff Gillardeau oysters Crassostrea ("true oyster" genus) Scallops Atlantic bay Great/king New Zealand Pecten jacobaeus Peruvian calico Yesso Placopecten magellanicus Gastropods Abalone White Red Black Green Pink Blacklip Greenlip Green ormer Pāua (group of three species) South African abalone Chilean Conches Queen Elegant Dog Limpets Black-foot opihi/Hawaiian Turtle/talc Yellow-foot opihi China Common European Rayed Mediterranean Ribbed Mediterranean Rustic Periwinkles Common Banded Littorina sitkana Whelks Common Kellet's Knobbed Lightning Channeled Other snails Sea Mud-flat Korean mud Chorus giganteus Land Cornu aspersum Helix lucorum Helix pomatia Freshwater Nerites Inkfish Cuttlefish Spineless Bottletail Octopus Common Atlantic white-spotted Big blue Pacific giant Southern red Mimic Amphioctopus fangsiao Squid New Zealand arrow Japanese flying Humboldt Neon flying Chitons Chiton magnificus Acanthopleura granulata Related topics Oyster farming Land snail farming Gastropod anatomy Bivalve anatomy Taxon identifiers Wd: Q927080 ADW: Helix_aspersa ARKive: helix-aspersa BioLib: 16674 EoL: 449907 Fauna Europaea: 426245 GBIF: 5190508 iNaturalist: 55888 ITIS: 77906 NCBI: 6535 Retrieved from "" Categories: HelicidaeEdible gastropodsAgricultural pest molluscsMolluscs described in 1774Molluscs described in the 18th centuryInvasive gastropod speciesHidden categories: Webarchive template wayback linksArticles with French-language external linksWebarchive template webcite linksArticles with 'species' microformatsAll articles with dead external linksArticles with dead external links from August 2017Articles with permanently dead external linksArticles containing video clips

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Cornu_aspersum - Photos and All Basic Informations

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LimoniumConservation StatusTaxonomy (biology)AnimalMolluscGastropodHeterobranchiaEuthyneuraPanpulmonataEupulmonataStylommatophoraSigmurethraHelicoideaHelicidaeBinomial NomenclatureOtto Friedrich MüllerSynonym (taxonomy)Common NameLand SnailTerrestrial MolluscsPulmonateGastropodMolluscHelicidaeMolluscEnlargeEnlargeMuséum De ToulouseCalcium CarbonateWhorl (mollusc)Operculum (gastropod)EpiphragmAestivationOverwinteringOsmoticHaemolymphMantle (mollusc)OsmoregulationTentacleInvaginationChitinRadulaJeremy (snail)ICZN CodeEnlargeEnlargePulmonataHermaphroditeGameteSexSelf-fertilisationSpermLove DartEnlargeHibernaculum (zoology)DoocotEglinton CastleMediterranean RegionList Of Non-marine Molluscs Of EgyptWestern EuropeAfricaIberian PeninsulaAsia MinorBritish IslesEnlargeWhite MulberryJohannesburgSouth AfricaNaturalisation (biology)Neolithic RevolutionList Of Non-marine Molluscs Of The Czech RepublicAustraliaNew ZealandNorth AmericaSouth AmericaSouthern 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