Allenella formalis

[2][3] It is endemic to Australia's Lord Howe Island in the Tasman Sea.

[3][4] 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.

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.

[4] The snail occurs on the summits and upper slopes of the island's southern mountains.