The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red Lists are produced by countries or organizations, which assess the risk of extinction to species within a political management unit.
The Chinese paddlefish, also known as Chinese swordfish, is a reportedly extinct species of fish that was native to the Yangtze and Yellow River basins in China. At maturity, the species measured an average length of 3 m (9.8 ft), making it one of the largest species of primarily freshwater fishes. It was the only species in the genus Psephurus and one of two living species in the paddlefish family (Polyodontidae), the other being the American paddlefish. It was an anadromous species, meaning that it spent part of its adult life at sea, while migrating upriver to spawn. Unlike its close relative, the Chinese paddlefish was largely piscivorous, and mainly preyed on small to medium-sized fish.
The conservation status of a group of organisms indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservation status: not simply the number of individuals remaining, but the overall increase or decrease in the population over time, breeding success rates, and known threats. Various systems of conservation status exist and are in use at international, multi-country, national and local levels as well as for consumer use.
Coregonus vandesius, the vendace, is a freshwater whitefish found in the United Kingdom. Population surveys since the 1960s have revealed a steady decline and the fish is no longer present in some of its previous haunts but is still present in Bassenthwaite Lake and Derwent Water. The main threats it faces are eutrophication and the introduction of alien species of fish which eat its eggs and fry. The International Union for Conservation of Nature has rated its conservation status as "endangered".
A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation. They do not qualify as threatened, near threatened, or conservation dependent.
A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature as that may be endangered in the near future, although it does not currently qualify for the threatened status.
Afrocarpus gracilior is a species of coniferous tree in the family Podocarpaceae known as benet in Marakwet and East African yellowwood, African fern tree, or bastard yellowwood in English
Juniperus gracilior is a species of conifer in the cypress family, Cupressaceae. It is endemic to the Caribbean island of Hispaniola, where there are localized populations in both Haiti and the Dominican Republic.
Dermophis costaricense is a species of caecilian in the family Dermophiidae. It is endemic to Costa Rica and is found on the Atlantic versant of Cordillera de Tilarán, Cordillera Central, and Cordillera de Talamanca. Its taxonomic status is in need of a review.
Dermophis gracilior is a species of caecilian in the family Dermophiidae. It is found on the Pacific slopes of Cordillera de Talamanca in eastern Costa Rica and western Panama, as well as in the central Pacific Costa Rica. Some sources also report it from the Atlantic slope of Costa Rica.
Haplochromis gracilior, known in Rwanda as the Boulenger's Kivu haplo and in the aquarium fish trade as Haplochromis 'torpedo stripe', is a species of cichlid fish endemic to Lake Kivu on the border of the Democratic Republic of the Congo and Rwanda. This species can reach a length of 10.4 centimetres (4.1 in) SL.
Tropheops gracilior is a species of cichlid endemic to Lake Malawi where it lives in caves.
Fibulacamptus bisetosus is a species of harpacticoid copepod in the family Canthocamptidae. It is found in Australia.
Fibulacamptus is an Australian endemic genus of crustacean in the family Canthocamptidae. Two of the four species are listed as vulnerable species on the IUCN Red List :
Haplophthalmus abbreviatus is a species of woodlouse in the family Trichoniscidae. It is found in Europe & Northern Asia.
Haplophthalmus rhinoceros is a species of woodlouse in the family Trichoniscidae. It is found in Europe and Northern Asia.
Hesperodiaptomus augustaensis is a species of calanoid copepod in the family Diaptomidae.
Hesperodiaptomus californiensis is a species of calanoid copepod in the family Diaptomidae.
Crataegus mexicana is a species of hawthorn known by the common names tejocote, manzanita, tejocotera and Mexican hawthorn. It is native to the mountains of Mexico and parts of Guatemala, and has been introduced in the Andes. The fruit of this species is one of the most useful among hawthorns.
The slender thread snake or slender worm snake is a species of snake in the family Leptotyphlopidae. It is found in southern Namibia and western South Africa.
