Definition
Vertigo angustior is a species of minute, air‑breathing land snail, a terrestrial pulmonate gastropod mollusk belonging to the family Vertiginidae, commonly referred to as the “vertigo snails” or “whorl snails.”
Overview
Vertigo angustior is a micromollusc characterized by a very small, conical shell that typically measures less than 2 mm in maximum dimension. The species inhabits moist terrestrial environments, often found in leaf litter, under stones, or among mosses in calcareous grasslands and woodlands. It is distributed in parts of Europe, with recorded occurrences in the United Kingdom, Ireland, the Netherlands, Belgium, France, and several central‑European countries. The International Union for Conservation of Nature (IUCN) has assessed the species as “Near Threatened” in some national Red Lists due to habitat loss and fragmentation, although its global status has not been formally evaluated.
Etymology / Origin
The generic name Vertigo derives from the Latin vertigo (“a turning” or “a whirl”), a reference to the tightly coiled whorls of the shell. The specific epithet angustior is Latin for “narrower,” describing the comparatively slender shape of the shell compared with related species in the genus.
Characteristics
| Feature | Description |
|---|---|
| Shell size | Typically 1.5–2.0 mm in height; 1.0–1.3 mm in width. |
| Shell shape | Ovate‑conical with 4–5 whorls; the aperture is narrow and rounded. |
| Surface sculpture | Fine growth lines; occasional weak ribbing; glossy appearance when fresh. |
| Color | Transparent to pale amber when alive; becomes opaque brownish after death. |
| Soft body | Light‑colored mantle and foot; two pairs of tentacles typical of pulmonates. |
| Habitat preferences | Moist, shaded microhabitats with abundant calcium; often associated with calcareous soils. |
| Reproduction | Hermaphroditic; lays eggs in small clusters within the substrate. |
| Conservation concerns | Sensitive to drainage, agricultural intensification, and urban development; some populations are protected under national legislation. |
Related Topics
- Vertiginidae – the family of small land snails that includes Vertigo and related genera.
- Micromolluscs – a term for mollusks whose adult shells are less than 5 mm in size.
- Terrestrial pulmonate gastropods – a broad group of air‑breathing land snails and slugs.
- Habitat conservation – management practices aimed at preserving the moist, calcareous habitats required by many vertiginid snails.
Accurate information is not confirmed regarding the species’ exact global population size and any potential taxonomic revisions that may have occurred after the most recent literature review.