The Alpine Whorl Snail (Vertigo alpestris) is a minute species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.
{{taxobox | name = Alpine Whorl Snail | image = Vertigo_alpestris.jpg | image_caption = Shell of Vertigo alpestris | regnum = [[Animalia]] | phylum = [[Mollusca]] | classis = [[Gastropoda]] | subclassis = [[Heterobranchia]] | ordo = [[Stylommatophora]] | super_familia = [[Pupilloidea]] | familia = [[Vertiginidae]] | genus = ''[[Vertigo (gastropod)|Vertigo]]'' | species = V. alpestris | binomial = Vertigo alpestris | binomial_authority = Alder, 1838 }}
Vertigo alpestris is characterized by its small size and preference for cool, moist, often mountainous habitats.
Description
The shell of Vertigo alpestris is typically ovate-conical or somewhat pear-shaped, measuring about 1.8 to 2.2 millimeters in height and 1.1 to 1.3 mm in width. It is usually brownish or reddish-brown, sometimes translucent, with a glossy surface. The shell has 4 to 5 convex whorls, with the last whorl being relatively large.
The aperture (shell opening) is typically armed with several teeth or lamellae, which are characteristic features of the Vertigo genus. In Vertigo alpestris, there are usually 3 to 4 teeth: a prominent parietal lamella (on the inner lip), a columellar lamella (on the central axis), and one or two palatal teeth (on the outer lip). The palatal teeth are often positioned more deeply within the aperture. The shell surface may exhibit very fine growth lines.
Habitat and Ecology
As its common name suggests, Vertigo alpestris is predominantly an alpine or subalpine species, though it can also be found at lower altitudes in northern regions. It inhabits cool, moist environments, often in mountainous areas, forests, open woodlands, and along streams. Preferred microhabitats include moss carpets, leaf litter, under stones, and on damp rock faces, particularly where there is calcareous substrate. It is often found associated with herbaceous plants and grasses.
Like other whorl snails, Vertigo alpestris is a detritivore, feeding on decaying plant matter, fungi, and microalgae found on surfaces in its habitat. Its small size allows it to exploit crevices and microscopic niches.
Distribution
The distribution of Vertigo alpestris is primarily Palearctic. It is widely distributed across the mountainous regions of Europe, including the Alps, Carpathians, Pyrenees, and Scandinavian mountains. It also extends into parts of northern Europe (e.g., Fennoscandia, British Isles) where it can be found at lower altitudes, often in relict populations. Its range continues eastward into parts of Asia.
Conservation Status
Globally, Vertigo alpestris is generally considered to be of "Least Concern" by the IUCN Red List due to its wide distribution and often stable populations. However, specific local populations may be vulnerable to habitat loss, climate change, or changes in land management practices, particularly in its relict lowland habitats. Monitoring of local populations is important to ensure its continued presence.
Etymology
The genus name Vertigo is Latin for "turning" or "whirling," likely referring to the spiral shape of the shell or the small, often difficult-to-spot nature of these snails. The specific epithet alpestris is Latin for "of the Alps" or "alpine," reflecting its typical mountainous habitat.