''Innesoconcha segna'', also known as the pale glass-snail, is a

species In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...

of land snail that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found els ...

to Australia's

Lord Howe Island Lord Howe Island (; formerly Lord Howe's Island) is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, part of the Australian state of New South Wales. It lies directly east of mainland ...

in the

Tasman Sea The Tasman Sea ( Māori: ''Te Tai-o-Rēhua'', ) is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about across and about from north to south. The sea was named after the Dutch explorer ...

Taxonomy

''I. segna'' is sometimes considered to be a junior

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are al ...

of '' I. catletti''. However, the two forms exhibit differences in their shells as well as their genital anatomy, and they are treated as separate species by Hyman & Köhler (2020).

Description

The depressedly trochoidal shell of the mature snail is 5.9–7.8 mm in height, with a low spire and a diameter of 10.7–12 mm. It is glossy and pale golden-yellow in colour The whorls are rounded, with finely incised spiral grooves. It has an ovately lunate aperture and closed

umbilicus Umbilicus may refer to: *The navel or belly button *Umbilicus (mollusc), a feature of gastropod, Nautilus and Ammonite shell anatomy * ''Umbilicus'' (plant), a genus of over ninety species of perennial flowering plants *Umbilicus urbis Romae The ...

. The body of the animal (in alcohol) is light orange-brown.

Distribution and habitat

The snail is evidently very rare and known only from the localities of Boat Harbour and Rocky Run Creek on the island. It has only been collected in low numbers, and may be extinct.

References

segna Senj (; it, Segna, la, Senia, Hungarian and german: Zengg) is a town on the upper Adriatic coast in Croatia, in the foothills of the Mala Kapela and Velebit mountains. The symbol of the town is the Nehaj Fortress ( hr, Tvrđava Nehaj) which ...

Gastropods of Lord Howe Island Taxa named by Tom Iredale Gastropods described in 1944 {{Euconulidae-stub