| Helenoconcha leptalea | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Order: | Stylommatophora |
| Family: | Charopidae |
| Genus: | Helenoconcha |
| Species: | †H. leptalea |
| Binomial name | |
| †Helenoconcha leptalea Smith, 1892 | |
†Helenoconcha leptalea is an extinct species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
This species was endemic to Saint Helena. It is now extinct.
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological species. A series of Regional Red Lists, which assess the risk of extinction to species within a political management unit, are also produced by countries and organizations.
An IUCN Red List Critically Endangered species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of the 157,190 species currently on the IUCN Red List, 9,760 of those are listed as Critically Endangered, with 1,302 being possibly extinct and 67 possibly extinct in the wild.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction.
Helenoconcha is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae endemic to the island of Saint Helena, hence the genetic epithet. All species save for H. relicta, are extinct.
Helenoconcha minutissima is an extinct species of gastropod in the family Charopidae. It was endemic to Saint Helena.
†Helenoconcha polyodon was a species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
†Helenoconcha pseustes was a species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
†Helenoconcha sexdentata was a species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
Partula taeniata, common name the Moorean viviparous tree snail, is a species of terrestrial gastropod in the Partulidae family. It is endemic to French Polynesia.
The Ammonite Snail is a species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae. The species is endemic to Saint Helena Island, and is the only Helenoconcha species remaining.
Acrilla leptalea is an extinct species of sea snail, a marine gastropod mollusk in the family Epitoniidae, the wentletraps.
