Allenella formalis

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 Iredale, 1944[1]
Location of Lord Howe Island
Synonyms[2]
Allentula formalis (Iredale, 1944)

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]