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.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as known only by living members kept in captivity or as a naturalized population outside its historic range due to massive habitat loss.
Lirceus culveri, the Rye Cove cave isopod, is a species of isopod in the family Asellidae. It is found in North America.
Monolistra schottlaenderi is a species of isopod in the family Sphaeromatidae.
Nitocrella slovenica is a species of harpacticoid copepod in the family Ameiridae.
Spelaeoecia bermudensis is a species of ostracod in the family Deeveyidae.
Thermosphaeroma dugesi 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.
Thermosphaeroma subequalum is a species of isopod in the family Sphaeromatidae.
Thermosphaeroma thermophilum, commonly known as the Socorro isopod or Socorro sowbug, is a crustacean in the family Sphaeromatidae. It was endemic to the thermal water of Sedillo Spring located in Socorro County in the state of New Mexico, United States.
Thermosphaeroma mendozai is a species of isopod in the family Sphaeromatidae. It is found in Mexico.
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.
