Helix pomatia

Helix pomatia
Scientific classification
Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
Clade:Heterobranchia
Clade:Euthyneura
Order:Panpulmonata
Clade:Eupulmonata
Clade:Stylommatophora
Informal group:Sigmurethra
Family:Helicidae
Genus:Helix
Species: H. pomatia
Binomial name
Helix pomatia

Helix pomatia, common names the Roman snail, Burgundy snail, edible snail or escargot, is a species of large, edible, air-breathing land snail, a pulmonate gastropod terrestrial mollusc in the family Helicidae. It is a European species. In the English language it is called by the French name escargot when used in cooking (escargot simply means 'snail'). Although this species is highly prized as a food, it is difficult to cultivate and rarely farmed commercially.[3]

Distribution

Distribution map of Helix pomatia showing the European countries where the species is present
In Odenwald, Germany.
Cooked snails are called escargots

Distribution of Helix pomatia includes:

Southeastern and central Europe:[4]

Western Europe:

Northern Europe:

  • Denmark – Listed as a protected species.[8]
  • Southern Sweden[4]
  • Norway[4]
  • Finland[4]
  • In central and southern parts of Sweden, Norway and Finland, isolated and relatively small populations occur. It is not native to these countries, but is likely to have been imported by monks from Southern Europe during medieval times.
  • Latvia
  • Lithuania
  • Estonia[4]

Eastern Europe:

southern Europe:

Description

View of a shell of Helix pomatia
Helix pomatia (the larger snail) laying eggs)

The shell is creamy white to light brownish, often with indistinct brown colour bands.[4] The shell has five to six whorls.[4] The aperture is large.[4] The apertural margin is white and slightly reflected in adult snails.[4] The umbilicus is narrow and partly covered by the reflected columellar margin.[4]

The width of the shell is 30–50 mm.[4] The height of the shell is 30–45 mm.[4]

Ecology

Habitat

In southeastern Europe, H. pomatia lives in forests, open habitats, gardens, vineyards, especially along rivers, confined to calcareous substrate.[4] In central Europe, it occurs in open forests and shrubland on calcareous substrate.[4] It prefers high humidity and lower temperatures, and needs loose soil for burrowing to hibernate and lay its eggs.[4] It lives up to 2100 m above sea level in the Alps, but usually below 2000 m.[4] In the south of England, it is restricted to undisturbed grassy or bushy wastelands, usually not in gardens; it has a low reproduction rate and low powers of dispersal.[4]

Life cycle

Average distance of migration reaches 3.5–6.0 m.[4]

This snail is hermaphroditic. Reproduction in central Europe begins at the end of May.[4]

Roman snails with colored shells

Eggs are laid in June and July, in clutches of 40–65 eggs.[4] The size of the egg is 5.5–6.5 mm[4] or 8.6 × 7.2 mm.[10] Juveniles hatch after three to four weeks, and may consume their siblings under unfavourable climate conditions.[4] Maturity is reached after two to five years.[4] The life span is up to 20 years, but snails die faster often because of drying in summer and freezing in winter.[4] Ten-year-old individuals are probably not uncommon in natural populations.[4] The maximum lifespan is 35 years.[4]

During estivation or hibernation, this species creates a calcareous epiphragm to seal the opening of the shell.

Conservation

This species is listed in IUCN Red List, and in European Red List of Non-marine Molluscs as Least Concern.[11][12] Helix pomatia is threatened by continuous habitat destructions and drainage, usually less threatened by commercial collections.[4] Many unsuccessful attempts have been made to establish the species in various parts of England, Scotland and Ireland; it only survived in natural habitats in southern England, and is threatened by intensive farming and habitat destruction.[4] It is of lower concern in Switzerland and Austria, but many regions restrict commercial collecting.[4]

References

This article incorporates public domain text from the reference.[4]

  1. ↑ IUCN Red List of Threatened Species
  2. ↑ Linnaeus C. (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. pp. [1–4], 1–824. Holmiae. (Salvius).
  3. ↑ "Snail Cultivation (Heliciculture)". The Living World of Molluscs. Retrieved 14 June 2014.
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 "Species summary for Helix pomatia". AnimalBase, last modified 5 March 2009, accessed 6 September 2010.
  5. ↑ (in Czech) Dušek J., Hošek M. & Kolářová J. (2007). "Hodnotící zpráva o stavu z hlediska ochrany evropsky významných druhů a typů přírodních stanovišť v České republice za rok 2004–2006". Ochrana přírody 62(5): appendix 5:I-IV.
  6. ↑ "Protection for wild animals on Schedule 5 of the Wildlife and Countryside Act, 1981".
  7. ↑ "Helix pomatia". Stichting Anemoon, accessed 6 September 2010.
  8. ↑ " Vinbjergsnegl.". Danish Ministry of the Environment and Food, Environmental Protection Agency, Retrieved September 2017.
  9. ↑ Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109.
  10. ↑ 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.
  11. ↑ Neubert, E. "Helix pomatia". IUCN Red List of Threatened Species (ver. 2011.2). IUCNRedList.org. Retrieved 16 January 2012.
  12. ↑ Cuttelod, A.; Seddon, M.; Neubert, E. "European Red List of Non-marine Molluscs" (PDF). European Commission.

Further reading

  • Egorov R. (2015). "Helix pomatia Linnaeus, 1758: the history of its introduction and recent distribution in European Russia". Malacologica Bohemoslovaca 14: 91–101. PDF
  • (in Russian) Roumyantseva E. G. & Dedkov V. P. (2006). "Reproductive properties of the Roman snail Helix pomatia L. in the Kaliningrad Region, Russia". Ruthenica 15: 131–138. abstract
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