Allenella formalis

Allenella formalis
Scientific classification Edit this 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]
  • Allentula formalis (Iredale, 1944)

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]

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]

References

  1. ^ Iredale, Tom (1944). "The land Mollusca of Lord Howe Island". Australian Zoologist. 10 (3): 299–334.
  2. ^ a b MolluscaBase, ed. (2024). "Allenella formalis Iredale, 1944". MolluscaBase. Flanders Marine Institute. Retrieved 14 August 2024.
  3. ^ a b "Species Allenella formalis Iredale, 1944". Australian Faunal Directory. Department of Climate Change, Energy, the Environment and Water. Retrieved 14 August 2024.
  4. ^ 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.


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