Allenella formalis
Species of land snail
From Wikipedia, the free encyclopedia
Allenella formalis, also known as the brown turban pinhead snail, is a species of land snail in the family Punctidae.[2][3] It is endemic to Australia's Lord Howe Island in the Tasman Sea.[3][4]
| Allenella formalis | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Stylommatophora |
| Family: | Punctidae |
| Genus: | Allenella |
| Species: | A. formalis |
| Binomial name | |
| Allenella formalis | |
| |
| Location of Lord Howe Island | |
| Synonyms[2] | |
| |
Description
The globosely turbinate shell of the mature snail is 2.5–2.6 mm in height, with a diameter of 3.4–3.6 mm, and a moderately raised conical spire. It is amber to dark brown in colour. The whorls are rounded above and below a slightly angular periphery, with impressed sutures and closely spaced radial ribs. It has an ovately lunate aperture and narrowly open umbilicus. The animal is dark brown with a paler brown sole.[4]
Distribution and habitat
The snail occurs on the summits and upper slopes of the island's southern mountains.[4]