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.
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.
Boeckella bispinosa is a species of calanoid copepod in the family Centropagidae.
Boeckella calcaris is a species of calanoid copepod in the family Centropagidae.
Boeckella geniculata is a species of calanoid copepod in the family Centropagidae.
Boeckella nyoraensis is a species of calanoid copepod in the family Centropagidae.
Boeckella shieli is a species of calanoid copepod in the family Centropagidae.
Branchinecta mexicana is a species of fairy shrimp in the family Branchinectidae. It is found in Central America.
Calamoecia is a genus of copepods in the family Centropagidae confined to Australasia. It is thought to have evolved since the separation of the Australian continent from Antarctica. Three of the Australian endemic species are listed as vulnerable species on the IUCN Red List. The genus contains the following species:
Calamoecia elongata is a species of calanoid copepod in the family Centropagidae.
Calamoecia zeidleri is a species of calanoid copepod in the family Centropagidae.
Canthocamptus sublaevis is a species of harpacticoid copepod in the family Canthocamptidae. It is found in Australia.
Ceuthonectes rouchi is a species of harpacticoid copepod in the family Canthocamptidae. It is found in Europe.
Elaphoidella franci is a species of harpacticoid copepod in the family Canthocamptidae. It is found in Europe.
Elaphoidella jeanneli is a species of harpacticoid copepod in the family Canthocamptidae. It is found in Europe.
Hemiboeckella powellensis is a species of copepod endemic to Lake Powell, Western Australia. It is listed as a vulnerable species on the IUCN Red List. It was first described by I. A. E. Bayly in 1979. No females have been found.
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and invasive species. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas. Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. Some endangered species are the target of extensive conservation efforts such as captive breeding and habitat restoration.
Asca australica is a species of mite in the family Ascidae.
