An IUCN Red List Critically Endangered species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of the 157,190 species currently on the IUCN Red List, 9,760 of those are listed as Critically Endangered, with 1,302 being possibly extinct and 67 possibly extinct in the wild.
Labeobarbus alluaudi is a species of ray-finned fish in the family Cyprinidae. It has been found only in three rivers in Uganda. Some taxonomic authorities consider tis species to be a hybrid of Labeobarbus somereni and Labeobarbus ruwenzorii.
Alluaud's haplo is a species of freshwater fish in the cichlid family, Cichlidae. It is native to East Africa, where it occurs in many lakes, including Lake Victoria.
Allauad's catfish is a species of fish in the family Clariidae, the airbreathing catfishes. It is native to the lakes and rivers of East Africa.
Coelatura alluaudi is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Paragomphus alluaudi is a species of dragonfly in the family Gomphidae. It is found in Angola, Ethiopia, Kenya, and Tanzania. Its natural habitats are subtropical or tropical dry shrubland, subtropical or tropical moist shrubland, and rivers. It is threatened by habitat loss.
Teinobasis is a genus of damselflies in the family Coenagrionidae. Species occur in south-eastern Asia, Indonesia, Solomon Islands and Micronesia; one species, Teinobasis rufithorax, is found in Australia.
The San Felipe hutia, also known as the little earth hutia, is small, critically endangered, rat-like mammal found on the small island of Cayo de Juan Garcia off the southwest coast of Cuba. It was discovered in 1970 and is possibly extinct. Little is known about the species, except that it lives in swamps and coastal mangrove forests. It is a member of the hutia subfamily (Capromyinae), a group of stout rodents native to the Caribbean that are mostly endangered or extinct.
Deckenia is a genus of freshwater crabs from East Africa, in the family Potamonautidae, or sometimes in a family of its own, Deckeniidae. The genus was named by Hilgendorf after Karl Klaus von der Decken who collected the first examples during his expeditions to Africa. Both species live in swamps from Eyl in Somalia to Dar es Salaam, Tanzania, both in coastal areas and further inland. A third species, Deckenia alluaudi, lives in the Seychelles, and has been transferred to a separate genus, Seychellum.
Labeo alluaudi is a species of fish in the family Cyprinidae, the carps and minnows. It is native to the Cavally and Nipoué Rivers in Côte d'Ivoire and Liberia. It has also been reported from the Sewa River in Sierra Leone and the Via River in Liberia.
Seychellum alluaudi is a species of freshwater crab endemic to the Seychelles, and the only true freshwater crab in that country. It lives in rainforest streams on the archipelago's granitic high islands. Although it may be abundant, little is known about its biology. If its habitat were to decline in quality, S. alluaudi might become endangered, but it is currently listed as Vulnerable on the IUCN Red List.
Plethodontohyla alluaudi is a frog belonging to the Madagascar-endemic subfamily Cophylinae of the family Microhylidae. It is endemic to southeastern Madagascar. It is a terrestrial and fossorial frog that occurs in rainforest, including littoral forest. Despite being locally abundant, it is a difficult frog to find.
Eucarlia is a genus of spirobolidan millipedes containing six species; most of which are endemic to the island nation of Seychelles, and one native to the Indonesian island of Sulawesi. Four of the Seychelles species have been assessed by the IUCN Red List as either endangered, critically endangered, or extinct.
Clarias brachysoma is a species of fish in the family Clariidae. It is endemic to Sri Lanka. Its natural habitats are rain forest streams and lowland rivers. It is threatened by habitat loss.
Teinobasis rufithorax is a species of damselfly in the family Coenagrionidae, commonly known as a red-breasted longtail. It is found on Cape York Peninsula, in Queensland, Australia, and on Torres Strait islands, Maluku Island, Aru Islands, New Guinea, Bismarck Archipelago and the Solomon Islands. It inhabits shaded, deep waters.
The Mahé boulder cricket is an insect species endemic to Mahé island in Seychelles. This species of cricket is only found in two localities, the Morne Seychellois National Park and "La Reserve". The species had not been recorded since 1909, until its rediscovery in 2014. It is a restricted range species, with an area of occupancy less than 10 square kilometres (3.9 sq mi) and with a very fragmented population.
Uroplatus alluaudi, also known commonly as the northern flat-tail gecko and the northern leaf-tail gecko, is a species of lizard in the family Gekkonidae. The species is endemic to Madagascar.
Flexiseps alluaudi is a species of skink, a lizard in the family Scincidae. The species is endemic to Madagascar.
