Texas Invasive Species Institute

Texas Invasive Species Institute

Chocolate-band Snail

Eobania vermiculata

Class: Gastropoda
Order: Stylommatophora
Family: Helicidae

Eobania vermiculata

Photographer:Andrew Butko Source:www.wikimedia.org Copyright:CC BY-SA 3.0

Description

Eobania vermiculata is an air-breathing terrestrial snail. The color of the shell is variable, ranging from whitish to greenish yellow, often with multiple color bands or spots; the lower side  frequently has two brown bands and is whitish in color between lowest band and umbilicus. The shell has 4-4.5 whorls. The width of the shell is 22–32 mm and the height is 14–24 mm. The body of the snail is gray on the dorsal side and yellowish on the ventral side.

Ecological Threat

With Eobania vermiculata having a long lifespan (between 2-5 years), an established population has opportunity to continuously grow. The long lifespan could make this species grow from a minor concern to a major concern for native gastropod species, garden plants and agricultural crops alike. Vineyards are very threatened with Eobania vermiculata being observed on grape plants in their native range. That makes this snail a direct threat to California and Texas as vineyards are extremely prevalent in both. Even though it is not considered a pest in its native habitat, with no natural predators present, the appearance and establishment of the chocolate-band snail could pose as a threat to native snail populations.

Biology

Around 70 eggs per snail are laid with the size of the egg being 4.1 × 3 mm. Juveniles hatch shortly after and grow about 12–13 mm in diameter per year for 2 years. Maturity is reached after 2 years when the diameter reaches 25 mm. Snails reach 29–30 mm diameter in May/June of the second year, reaching a maximum diameter may take 5 years or more, but mortality increases greatly after 2 years.

History

Like other terrestrial snails Eobania vermiculata is used for food in the native lands of Europe. This is also a major factor to the spread of this snail, along with the fact it is used in the pet trade also. It has been accidentally introduced into Louisiana and Texas but is thought to be a minor threat to agriculture. However, since this snail has observed to feed on vineyards and other agricultural crops that grow within these 2 states, the threat of the chocolate-band snail may be larger than previously thought.

Native Origin

Spain, Ukraine and Greece

Current Location

U.S. Habitat: In a broad variety of habitats, usually in dry vegetation, mainly in coastal vicinity, also in agricultural crops and vineyards.

Distribution

U.S. Present: CA, LA and TX

Management

This species is considered to represent a potentially serious threat as a pest, an invasive species which could negatively affect agriculture, natural ecosystems, human health or commerce. Therefore it has been suggested that this species be given top national quarantine significance in the United States.

References

Cowie R. H., Dillon R. T., Robinson D. G. & Smith J. W. 2009. Alien non-marine snails and slugs of priority quarantine importance in the United States: A preliminary risk assessment. American Malacological Bulletin 27:113-132.

Heller J. 2001. Life History Strategies. In: Barker G. M. (ed.) The biology of terrestrial molluscs. CABI Publishing, Oxon, UK

Notton D. 2006. Eobania vermiculata in the UK. Mollusc World 11:6.

Rađa, B., Rađa, T., Puizina, J., Šamanic, I., & Šantic, M. 2012. Shell Characteristics of Land Snail Eobania vermiculata (Müller, 1774)(Helicidae) from Croatia. American Malacological Bulletin, 30(2):299-307.


Internet References

http://www.invasive.org/browse/detail.cfm?imgnum=5433342

http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/species?id=1367

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