| 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] | |
| |
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]
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]
The snail occurs on the summits and upper slopes of the island's southern mountains. [4]
Limborelia innesi, also known as the compact palmleaf snail, is a species of palmleaf snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Opinorelia is a monotypic genus of palmleaf snails that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Gyropena is a genus of two species of tiny pinwheel snails that are endemic to Australia's Lord Howe Island in the Tasman Sea.
Hedleyoconcha addita, also known as the Lord Howe Island conical pinwheel snail, is a species of pinwheel snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Pseudocharopa ledgbirdi, also known as the Mount Lidgbird pinwheel snail or the Mount Lidgbird charopid snail, is a species of pinwheel snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Pseudocharopa whiteleggei, also known as Whitelegge's pinwheel snail or Whitelegge's land snail, is a species of pinwheel snail that is endemic to Australia's Lord Howe Island in the Tasman Sea. It is the largest charopid species in Australia.
Gudeoconcha is a genus of glass snails that is endemic to Australia’s Lord Howe Island in the Tasman Sea. The single species is G. sophiae(Reeve, 1854). It has four subspecies, only two of which are extant:
Howearion belli, also known as the beautiful semislug, is a species of semislug that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Innesoconcha aberrans, also known as the black face glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Innesoconcha princeps, also known as the banded golden glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Melloconcha grata, also known as the angulate glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Melloconcha prensa, also known as the flattened glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Melloconcha flavescens, also known as the tiny yellow glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Melloconcha rosacea, also known as the tiny rosy glass-snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Allenella is a genus of three species of tiny pinhead or dot snails that are endemic to Australia's Lord Howe Island in the Tasman Sea. The genus was first described in 1944 by Tom Iredale.
Allenella planorum, also known as the angular pinhead snail, is a species of land snail in the family Punctidae. It is endemic to Australia's Lord Howe Island in the Tasman Sea.
Paralaoma compar, also known as the ribbed pinhead snail, is a species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Pernastela gnoma, also known as the dwarf pinhead snail, is a tiny species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Pernastela howensis, also known as the Lord Howe pinhead snail, is a tiny species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.
Goweroconcha wilsoni, also known as Gower Wilson's pinwheel snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the pinwheel snail family, that is endemic to Australia's Lord Howe Island in the Tasman Sea.