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.
Lirceus culveri, the Rye Cove cave isopod, is a species of isopod in the family Asellidae. It is found in North America.
Monolistra bolei is a species of isopod in the family Sphaeromatidae.
Monolistra is a genus of isopod crustaceans in the family Sphaeromatidae. Its members are restricted to countries of the former Yugoslavia and neighbouring Italy. It contains the following subgenera and species, four of which are listed as vulnerable (VU) or endangered (EN) on the IUCN Red List:
Monolistra calopyge is a species of isopod in the family Sphaeromatidae.
Monolistra spinosissima is a species of isopod in the family Sphaeromatidae.
Nitocrella slovenica is a species of harpacticoid copepod in the family Ameiridae.
Skistodiaptomus carolinensis is a species of calanoid copepod in the family Diaptomidae.
Spelaeoecia bermudensis is a species of ostracod in the family Deeveyidae.
Thermosphaeroma cavicauda is a species of isopod in the family Sphaeromatidae. It is found in Mexico.
Thermosphaeroma macrura is a species of isopod in the family Sphaeromatidae. It is found in Mexico.
Thermosphaeroma milleri is a species of isopod in the family Sphaeromatidae. It is found in Mexico.
Thermosphaeroma smithi is a species of isopod in the family Sphaeromatidae. It is found in Mexico.
Tropodiaptomus ctenopus is an extinct species of calanoid copepod in the family Diaptomidae.
Tropodiaptomus simplex is a species of calanoid copepod in the family Diaptomidae.
Lestes disjunctus, the northern spreadwing, is a species of spreadwing in the damselfly family Lestidae. It is found in North America.
Lestes eurinus, the amber-winged spreadwing, is a species of spreadwing in the damselfly family Lestidae. It is found in North America.
