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 
| |
| Domain: | Eukaryota |
| 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
editThe 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
editThe snail occurs on the summits and upper slopes of the island's southern mountains.[4]
References
edit- ^ Iredale, Tom (1944). "The land Mollusca of Lord Howe Island". Australian Zoologist. 10 (3): 299–334.
- ^ a b MolluscaBase, ed. (2024). "Allenella formalis Iredale, 1944". MolluscaBase. Flanders Marine Institute. Retrieved 14 August 2024.
- ^ a b "Species Allenella formalis Iredale, 1944". Australian Faunal Directory. Department of Climate Change, Energy, the Environment and Water. Retrieved 14 August 2024.
- ^ a b c Hyman, Isabel; Köhler, Frank (2020). A Field Guide to the Land Snails of Lord Howe Island. Sydney: Australian Museum. ISBN 978-0-9750476-8-2.