Helenodiscus bilamellata | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Heterobranchia |
Order: | Stylommatophora |
Family: | Charopidae |
Genus: | Helenodiscus |
Species: | †H. bilamellata |
Binomial name | |
†Helenodiscus bilamellata (G. B. Sowerby I, 1844) | |
Helenodiscus bilamellata was a species of small air-breathing land snail, terrestrial pulmonate gastropod mollusks in the family Charopidae.
This species was endemic to Saint Helena. It is now extinct.
Herring are forage fish, mostly belonging to the family of Clupeidae.
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.
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Helenodiscus is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
Helenodiscus vernoni was a species of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Charopidae.
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Onchidoris bilamellata, common name the rough-mantled doris, is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Onchidorididae.
Onchidoris is a genus of dorid nudibranchs in the family Onchidorididae. One of its members is known to prey on barnacles and the others eat bryozoans. The radula contains a rachidian tooth when fully developed, but this is vestigial in some species.
A vulnerable species is a species which has been categorized by the International Union for Conservation of Nature as being threatened with extinction unless the circumstances that are threatening its survival and reproduction improve.
Endangered species, as classified by the International Union for Conservation of Nature (IUCN), are species which have been categorized as very likely to become extinct in their known native ranges in the near future. On the IUCN Red List, endangered is the second-most severe conservation status for wild populations in the IUCN's schema after critically endangered. In 2012, the IUCN Red List featured 3,079 animal and 2,655 plant species as endangered worldwide. The figures for 1998 were 1,102 and 1,197 respectively.