On 29 January 2010, the IUCN Red List of Threatened Species identified 1859 critically endangered

Critically endangered

Version 2010.3 of the IUCN Red List of Threatened Species identified 3744 Critically Endangered species, subspecies and varieties, stocks and subpopulations.Critically Endangered by kingdom:*1993 Animalia*2 Fungi*1745 Plantae*4 Protista-References:...

 species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

, subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 and varieties, stocks and subpopulations in the Animalia kingdom.

Theraphosidae

Branchinectidae

Branchinectidae

Branchinectidae is a family in the order Anostraca , containing two genera – Branchinecta and Archaebranchinecta. The majority of the species are in the genus Branchinecta, with only Archaebranchinecta pollicifera and the fossil Archaebranchinecta barstowensis in the second genus....

Streptocephalidae

Platycopiidae

Platycopiidae

Platycopiidae is a family of copepods. Until the description of Nanocopia in 1988, it contained the single genus Platycopia. It now contains four genera, three of which are monotypic; the exception is Platycopia, with 8 species.-Systematics:...

Astacidae

Astacidae

The family Astacidae comprises the freshwater crayfish native to Europe and western North America. It is made up of three genera. Pacifastacus is found on the Pacific coast of the United States and British Columbia and includes the signal crayfish and the Shasta crayfish...

Cambaridae

Cambaridae

Cambaridae is the largest of the three families of freshwater crayfish, with over 400 species. Most of the species in the family are native to North America east of the Great Divide, such as the invasive species Procambarus clarkii and Orconectes rusticus, with fewer species living in East Asia and...

Gecarcinucidae

Gecarcinucidae

Gecarcinucidae is a family of freshwater crabs. Some scientists also include the genera placed in the family Parathelphusidae in a larger Gecarcinucidae....

Hippolytidae

Hippolytidae

Hippolytidae is a family of cleaner shrimp, also known as broken-back shrimp or anemone shrimp. The term "broken-back shrimp" also applies to the genus Hippolyte in particular and "cleaner shrimp" is sometimes applied exclusively to Lysmata amboinensis.-Genera:There are 36 recognised genera in the...

Potamidae

Potamidae

Potamidae is a family of freshwater crabs. Its more than 650 species and nearly 100 genera are divided into two subfamilies — Potaminae around the Mediterranean Sea, on Socotra and eastwards to Northern India, and Potamiscinae in East Asia....

Potamonautidae

Potamonautidae

Potamonautidae is a family of freshwater crabs endemic to tropical parts of Africa and adjacent islands, including Madagascar, the Seychelles, Zanzibar, Mafia, Pemba, Bioko, São Tomé, Príncipe and Sherbro Island. It comprises 18 extant genera and 138 extant species...

Pseudothelphusidae

Pseudothelphusidae

Pseudothelphusidae is a family of freshwater crabs found chiefly in mountain streams in the Neotropics. They are believed to have originated in the Greater Antilles and then crossed to Central America via a Pliocene land bridge.-Parasitology:...

Sphaeromatidae

Sphaeromatidae

Sphaeromatidae is a family of isopods, containing the following genera:*Afrocerceis Müller, 1995*Agostodina Bruce, 1994*Amphoroidea H...

Misophriidae

Mysidae

Mysidae

Mysidae is a family of crustaceans in the order Mysida or mysid shrimps. Six sub-families are recognised:* Boreomysinae Holt & W. M. Tattersall, 1905a* Siriellinae Norman, 1892* Rhopalophthalminae Hansen, 1910* Gastrosaccinae Norman, 1892...

Dytiscidae

Dytiscidae

Dytiscidae – based on the Greek dytikos , "able to dive" – are the predaceous diving beetles, a family of water beetles. They are about 25 mm long on average, though there is much variation between species. Dytiscus latissimus, the largest, can grow up to 45 mm long...

Lucanidae

Formicidae

Lycaenidae

Lycaenidae

The Lycaenidae are the second-largest family of butterflies, with about 6000 species worldwide, whose members are also called gossamer-winged butterflies...

Nymphalidae

Nymphalidae

The Nymphalidae is a family of about 5,000 species of butterflies which are distributed throughout most of the world. These are usually medium sized to large butterflies. Most species have a reduced pair of forelegs and many hold their colourful wings flat when resting. They are also called...

Chlorocyphidae

Chlorocyphidae

Chlorocyphidae is a family of damselfies, commonly known as jewels. They are most commonly found in Africa and Asia.- See also :* List of damselflies of the world...

Chlorogomphidae

Chlorogomphidae

The Chlorogomphidae are a family of Odonata from the suborder Anisoptera....

Coenagrionidae

Coenagrionidae

The insect family Coenagrionidae is found in the order Odonata and the suborder Zygoptera. The Zygoptera are the damselflies, which although less known than the dragonflies, are no less common. There are more than 1100 species in this family, making it the largest damselfly family...

Cordulegastridae

Cordulegastridae

The Cordulegastridae are a family of Odonata from the suborder Anisoptera. They are commonly known as Spiketails. Some vernacular names for the species of this family are biddie and flying adder. They have a large brown or black body with yellow markings. They can be found along small, clear,...

Gomphidae

Gomphidae

Gomphidae is an Odonata family that contains about 90 genera and 900 species. They are commonly referred to as clubtail dragonflies. The name refers to the clublike widening of the end of the abdomen...

Lestidae

Lestidae

Lestidae is a rather small family of cosmopolitan, large-sized, slender damselflies. They are of the order of the dragonflies and are commonly known as "Spreadwings." There are two subfamilies in Lestdae. The first subfamily is Lestinae. Damselflies in Lestinae rest with their wings partly open...

Libellulidae

Libellulidae

The skimmers or perchers and their relatives form the Libellulidae, the largest dragonfly family in the world. It is sometimes considered to contain the Corduliidae as the subfamily Corduliinae and the Macromiidae as the subfamily Macromiinae. Even if these are excluded , there still remains a...

Megapodagrionidae

Megapodagrionidae

Megapodagrionidae is a family of damselflies, commonly called flatwings for their habit of spreading out the hindwings horizontally when at rest...

Platycnemididae

Platycnemididae

Platycnemididae are a family of damselfly called white-legged damselflies. It is sometimes known as Platycnemidae.This is a list of genera with the number of species in each.*Allocnemis — 2 species*Arabicnemis — 1 species...

Platystictidae

Platystictidae

Platystictidae is a family of damselflies, commonly known as shadowdamsels. They look very similar to the threadtail damselfly family . They can mostly be found throughout Asia, Central America, and South America.- See also :...

Protoneuridae

Protoneuridae

Protoneuridae is a family of damselflies. Most species are commonly known as threadtails, while others are commonly known as bambootails. They are called threadtails because their abdomen are pin-thin. Threadtails are usually small size damselflies and their wings are usually transparent...

Tettigoniidae

Tettigoniidae

The family Tettigoniidae, known in American English as katydids and in British English as bush-crickets, contains more than 6,400 species. It is part of the suborder Ensifera and the only family in the superfamily Tettigonioidea. They are also known as long-horned grasshoppers, although they are...

Acipenseridae

Bedotiidae

Bedotiidae

Bedotiidae is a family of fish known as the Madagascar rainbowfish, Madagascan rainbowfish, or Malagasy rainbowfish due to their endemism to Madagascar. It includes two genera, Bedotia and Rheocles.-Anatomy and morphology:...

Melanotaeniidae

Pseudomugilidae

Pseudomugilidae

The Blue-eyes are the family of atheriniform fish, the Pseudomugilidae, related to the rainbowfishes. They inhabit fresh and brackish water in Australia and New Guinea. Blue-eyes are small fish, typically no more than in length...

Adrianichthyidae

Clupeidae

Clupeidae

Clupeidae is the family of the herrings, shads, sardines, hilsa and menhadens. It includes many of the most important food fishes in the world.-Description and biology:...

Balitoridae

Cobitidae

Cyprinidae

Cyprinodontidae

Goodeidae

Goodeidae

Splitfins, are a family, Goodeidae, of teleost fish endemic to Mexico and some areas of the United States. This family contains 40 species within 18 genera. The family is named after ichthyologist George Brown Goode.-Range and Geographic Distribution:...

Poeciliidae

Poeciliidae

Poeciliidae is a family of fresh-water fish which are live-bearing aquarium fish . They belong to the order Cyprinodontiformes, tooth-carps, and include well-known aquarium fish such as the guppy, molly, platy, and swordtail...

Belontiidae

Cichlidae

Eleotridae

Eleotridae

Sleeper gobies are members of the Eleotridae fish family, found predominantly in the tropical Indo-Pacific. There are approximately 35 genera and 150 species. While many eleotrids pass through a planktonic stage in the sea and some spend their entire lives in the sea, as adults the majority live in...

Gobiidae

Percidae

Percidae

The Percidae are a family of perciform fish found in fresh and brackish waters of the Northern Hemisphere. The family contains about 200 species in ten genera...

Polyprionidae

Sciaenidae

Sciaenidae

Sciaenidae is a family of fish commonly called drums, croakers, or hardheads for the repetitive throbbing or drumming sounds they make...

Scombridae

Scombridae

Scombridae is the family of the mackerels, tunas, and bonitos, and thus includes many of the most important and familiar food fishes. The family consists of about 55 species in 15 genera and two subfamilies...

Serranidae

Serranidae

Serranidae is a large family of fishes, belonging to the order Perciformes. The family contains about 450 species of serranids in 64 genera, including the sea basses and the groupers...

Galaxiidae

Salmonidae

Salmonidae

Salmonidae is a family of ray-finned fish, the only living family currently placed in the order Salmoniformes. It includes salmon, trout, chars, freshwater whitefishes and graylings...

Cottidae

Cottidae

The Cottidae is a family of demersal fish in the order Scorpaeniformes, suborder Cottoidei . There are about 300 species in 70 genera of Cottidae that are mostly marine and found in shallow coastal waters in the northern and arctic regions...

Clariidae

Ictaluridae

Ictaluridae

The Ictaluridae, sometimes called Ictalurids, are a family of catfish native to North America, where they are important food fish and sometimes as a sport fish. They include fish commonly known as bullheads, madtoms, channel catfish, and blue catfish....

Mochokidae

Mochokidae

The Mochokidae are a family of catfishes that are known as the squeakers and upside-down catfish. There are 10 genera and about 188 species of mochokids. All the mochokids are freshwater species originating from Africa....

Pangasiidae

Amphignathodontidae

Amphignathodontidae

The marsupial frogs are a disputed family in the order Anura. Where it is treated as a separate family, it consists of two genera, Gastrotheca, and Flectonotus. These frogs are native to Neotropical America . Under other classifications, these are treated as part of family Hemiphractidae...

Aromobatidae

Aromobatidae

The Aromobatidae are a family of frogs which are native to Central and South America....

Arthroleptidae

Arthroleptidae

Arthroleptidae is a family of frogs found in Sub-Saharan Africa. They are also known as squeakers because of their high-pitched call. They are small, less than in length, terrestrial frogs found mostly in leaf litter on the forest floor. They completely bypass any aquatic stage, and therefore do...

Bufonidae

Centrolenidae

Ceratophryidae

Craugastoridae

Craugastoridae

Craugastoridae is a family of frogs which consists of 2 genera with a disjunct distribution: Craugastor and Haddadus.The genus Craugastor, with 112 species, has the largest distribution and can be found in the southwestern United States, Mexico, Central America up to northwestern South America. The...

Cycloramphidae

Dendrobatidae

Dicroglossidae

Eleutherodactylidae

Heleophrynidae

Hylidae

Hyperoliidae

Hyperoliidae

Hyperoliidae is a family of small to medium sized, brightly colored, frogs which contains more than 250 species in 19 genera. Seventeen genera are native to sub-Saharan Africa. In addition,the monotypic genus Tachycnemis occurs on the Seychelles Islands, and the genus Heterixalus is endemic to...

Leptodactylidae

Leptodactylidae

Leptodactylidae is a diverse family of frogs that probably diverged from other hyloids during the Cenozoic era, or possibly at the end of the Mesozoic. There are roughly 50 genera, one of which is Eleutherodactylus, the largest vertebrate genus, with over 700 species...

Mantellidae

Mantellidae

Mantellidae is a family of the order Anura. These frogs are found only in Madagascar and Mayotte.The habits, habitat and appearance of these frogs are widely variable. Most species are terrestrial, though some are arboreal or aquatic. Body size ranges from 3 to 10 centimetres in length...

Megophryidae

Megophryidae

Megophryidae are a large family of frogs native to the warm southeast of Asia, from the Himalaya foothills eastwards, south to Indonesia and the Greater Sunda Islands in Maritime Southeast Asia, and extending to the Philippines. As of mid-2008 it encompasses approximately 70-100 species of frog...

Microhylidae

Microhylidae

Microhylidae is a geographically widespread family of frogs. There are 413 species in 69 genera and nine subfamilies, which is the largest number of genera of any frog family.-Description:...

Myobatrachidae

Myobatrachidae

Myobatrachidae is a family of frogs found in Australia and New Guinea. Members of this family vary greatly in size, from species less than long, to the second largest frog in Australia, the Giant Barred Frog , at in length...

Petropedetidae

Pyxicephalidae

Pyxicephalidae

Pyxicephalidae is a family of frogs.-Classification:Pyxicephalidae contains two subfamilies, with a total of 13 genera. This family was formerly considered part of the family Ranidae.Family PYXICEPHALIDAE* Subfamily Cacosterninae...

Ranidae

Ranixalidae

Rhacophoridae

Rhacophoridae

Rhacophoridae is a family of frog species, which occur in tropical regions of Asia and Africa. They are commonly known as shrub frogs, or more ambiguously as "moss frogs" or "bush frogs". Some Rhacophoridae are called "tree frogs"...

Strabomantidae

Strabomantidae

Strabomantidae is a family of frogs which are native to South America. These frogs lack a free-living larval stage and hatch directly into miniature "froglets".-Systematics:Holoadeninae*Barycholos*Bryophryne*Euparkerella*Holoaden...

Ambystomatidae

Hynobiidae

Plethodontidae

Salamandridae

Salamandridae

Salamandridae is a family of salamanders consisting of true salamanders and newts. Currently, 74 species have been identified in the northern hemisphere - Europe, Asia, the northern tip of Africa and North America...

Anatidae

Anatidae

Anatidae is the biological family of birds that includes ducks, geese and swans. The family has a cosmopolitan distribution, occurring on all the world's continents except Antarctica and on most of the world's islands and island groups...

Trochilidae

Caprimulgidae

Charadriidae

Charadriidae

The bird family Charadriidae includes the plovers, dotterels, and lapwings, about 64 to 66 species in all.- Morphology :They are small to medium-sized birds with compact bodies, short, thick necks and long, usually pointed, wings, but most species of lapwing may have more rounded wings...

Scolopacidae

Scolopacidae

The sandpipers are a large family, Scolopacidae, of waders or shorebirds. They include many species called sandpipers, as well as those called by names such as curlew and snipe. The majority of these species eat small invertebrates picked out of the mud or soil...

Threskiornithidae

Threskiornithidae

The family Threskiornithidae includes 34 species of large terrestrial and wading birds, falling into two subfamilies, the ibises and the spoonbills. It was formerly known as Plataleidae. The spoonbills and ibises were once thought to be related to other groups of long-legged wading birds in the...

Columbidae

Alcedinidae

Bucerotidae

Cuculidae

Accipitridae

Accipitridae

The Accipitridae, one of the two major families within the order Accipitriformes , are a family of small to large birds with strongly hooked bills and variable morphology based on diet. They feed on a range of prey items from insects to medium-sized mammals, with a number feeding on carrion and a...

Cracidae

Cracidae

The chachalacas, guans and curassows are birds in the family Cracidae.These are species of tropical and subtropical Central and South America. One species, the Plain Chachalaca, just reaches southernmost Texas in the USA...

Phasianidae

Phasianidae

The Phasianidae is a family of birds which consists of the pheasants and partridges, including the junglefowl , Old World Quail, francolins, monals and peafowl. The family is a large one, and is occasionally broken up into two subfamilies, the Phasianinae, and the Perdicinae...

Rallidae

Rallidae

The rails, or Rallidae, are a large cosmopolitan family of small to medium-sized birds. The family exhibits considerable diversity and the family also includes the crakes, coots, and gallinules...

Alaudidae

Corvidae

Corvidae

Corvidae is a cosmopolitan family of oscine passerine birds that contains the crows, ravens, rooks, jackdaws, jays, magpies, treepies, choughs and nutcrackers. The common English names used are corvids or the crow family , and there are over 120 species...

Emberizidae

Emberizidae

The Emberizidae are a large family of passerine birds. They are seed-eating birds with a distinctively shaped bill.In Europe, most species are called buntings. In North America, most of the species in this family are known as sparrows, but these birds are not closely related to the sparrows, the...

Fringillidae

Furnariidae

Mimidae

Monarchidae

Parulidae

Rhinocryptidae

Sturnidae

Sylviidae

Sylviidae

Sylviidae is a family of passerine birds that was part of an assemblage known as the Old World warblers. The family was formerly a wastebin taxon with over 400 species of bird in over 70 genera. The family was poorly defined with many characteristics shared with other families...

Thamnophilidae

Thraupidae

Troglodytidae

Turdidae

Zosteropidae

Picidae

Picidae

The woodpeckers, piculets and wrynecks are a family, Picidae, of near-passerine birds. Members of this family are found worldwide, except for Australia and New Zealand, Madagascar, and the extreme polar regions...

Podicipedidae

Diomedeidae

Hydrobatidae

Procellariidae

Procellariidae

The family Procellariidae is a group of seabirds that comprises the fulmarine petrels, the gadfly petrels, the prions, and the shearwaters. This family is part of the bird order Procellariiformes , which also includes the albatrosses, the storm-petrels, and the diving petrels.The procellariids are...

Psittacidae

Strigidae

Petromyzontidae

Carcharhinidae

Lamnidae

Lamnidae

Lamnidae is a family of sharks, commonly known as mackerel sharks or white sharks. They are large, fast-swimming sharks, found in oceans worldwide....

Odontaspididae

Dasyatidae

Pristidae

Rajidae

Centrophoridae

Centrophoridae

Centrophoridae are a family of squaliform sharks. The family contains just two genera and approximately 15 species. They are sometimes called gulper sharks but this is also the name of a specific species in the family, Centrophorus granulosus....

Squalidae

Squalidae

Squalidae is the family of dogfish sharks. They are found in the Atlantic, Pacific, and Indian oceans, from tropical equatorial climates to the Arctic and Antarctic....

Squatinidae

Chrysochloridae

Canidae

Canidae

Canidae is the biological family of carnivorous and omnivorous mammals that includes wolves, foxes, jackals, coyotes, and domestic dogs. A member of this family is called a canid . The Canidae family is divided into two tribes: Canini and Vulpini...

Felidae

Felidae

Felidae is the biological family of the cats; a member of this family is called a felid. Felids are the strictest carnivores of the thirteen terrestrial families in the order Carnivora, although the three families of marine mammals comprising the superfamily pinnipedia are as carnivorous as the...

Phocidae

Balaenidae

Balaenidae

Balaenidae is a family of mysticete whales that contains two living genera. Commonly called the right whales as it contains mainly right whale species...

Balaenopteridae

Bovidae

Delphinidae

Eschrichtiidae

Eschrichtiidae

Eschrichtiidae is a family of baleen whales in the suborder Mysticeti.At least five genera are recognised, but only a single species from one genus is still alive, the gray whale, Eschrichtius robustus....

Monodontidae

Monodontidae

The cetacean family Monodontidae comprises two unusual whale species, the narwhal, in which the male has a long tusk, and the white beluga whale...

Phocoenidae

Natalidae

Natalidae

The family Natalidae, or funnel-eared bats are found from Mexico to Brazil and the Caribbean islands. The family has three genera, Chilonatalus, Natalus and Nyctiellus. They are slender bats with unusually long tails and, as their name suggests, funnel-shaped ears. They are small, at only 3.5 to...

Pteropodidae

Vespertilionidae

Macropodidae

Phalangeridae

Phalangeridae

Phalangeridae is a family of nocturnal marsupials native to Australia and New Guinea, including the cuscuses, brushtail possums, and their close relatives...

Potoroidae

Potoroidae

The marsupial family Potoroidae includes the bettongs, potoroos, and two of the rat-kangaroos. All are rabbit-sized, brown, jumping marsupials and resemble a large rodent or a very small wallaby.- Characteristics :...

Soricidae

Tachyglossidae

Equidae

Equidae

Equidae is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils. All extant species are in the genus Equus...

Rhinocerotidae

Atelidae

Atelidae

Atelidae is one of the five families of New World monkeys now recognised. It was formerly included in the family Cebidae. Atelids are generally larger monkeys; the family includes the howler, spider, woolly and woolly spider monkeys...

Callitrichidae

Cebidae

Cebidae

The Cebidae is one of the five families of New World monkeys now recognised. It includes the capuchin monkeys and squirrel monkeys. These species are found throughout tropical and subtropical South and Central America.-Characteristics:...

Cercopithecidae

Hominidae

Hominidae

The Hominidae or include them .), as the term is used here, form a taxonomic family, including four extant genera: chimpanzees , gorillas , humans , and orangutans ....

Hylobatidae

Indriidae

Indriidae

The Indriidae are a family of strepsirrhine primates. They are medium to large sized lemurs with only four teeth in the toothcomb instead of the usual six...

Lemuridae

Lemuridae

Lemuridae is a family of prosimian primates native to Madagascar, and one of five families commonly known as lemurs. These animals were thought to be the evolutionary predecessors of monkeys and apes, but this is no longer considered correct...

Pitheciidae

Pitheciidae

The Pitheciidae are one of the five families of New World monkeys now recognised. Formerly they were included in the family Atelidae. The family includes the titis, saki monkeys and uakaris...

Capromyidae

Chinchillidae

Chinchillidae

The family Chinchillidae contains the chinchillas, viscachas, and their fossil relatives. They are restricted to southern and western South America, often in association with the Andes. They are large rodents, weighing from to , with strong hind legs and large ears...

Cricetidae

Cricetidae

The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, and New World rats and mice...

Ctenomyidae

Echimyidae

Geomyidae

Heteromyidae

Heteromyidae

The family of rodents that include kangaroo rats, kangaroo mice and rock pocket mice is the Heteromyidae family. Most heteromyids live in complex burrows within the deserts and grasslands of western North America, though species within the Heteromys and Liomys genera are also found in forests and...

Muridae

Muridae

Muridae is the largest family of mammals. It contains over 600 species found naturally throughout Eurasia, Africa, and Australia. They have been introduced worldwide. The group includes true mice and rats, gerbils, and relatives....

Octodontidae

Octodontidae

The Octodontidae are a family of rodents, restricted to south-western South America. Thirteen species of octodontid are recognised, arranged in nine genera. The best known species is the Degu, Octodon degus....

Sciuridae

Crocodylidae

Agamidae

Agamidae

Agamids, lizards of the family Agamidae, include more than 300 species in Africa, Asia, Australia, and a few in Southern Europe. Many species are commonly called dragons or dragon lizards. Phylogenetically they may be sister to the Iguanidae, and have a similar appearance. Agamids usually have...

Anguidae

Anguidae

The Anguidae is a large and diverse family of lizards native to the northern hemisphere. The group includes the slowworms, glass lizards, and alligator lizards, among others. Anguidae is divided into three subfamilies and contains 94 species in eight genera. Their closest living relatives are the...

Colubridae

Gekkonidae

Iguanidae

Iguanidae

Iguanidae is a family of lizards, composed of iguanas and related species.-Classification of Iguanidae:Two different classification schemes have been used to define the structure of this family. These are the "traditional" classification and the classification presented by Frost et al. .Frost et...

Lacertidae

Lacertidae

Lacertidae is the family of the wall lizards, true lizards, or sometimes simply lacertas, which are native to Europe, Africa, and Asia. The group includes the genus Lacerta, which contains some of the most commonly seen lizard species in Europe...

Scincidae

Viperidae

Viperidae

The Viperidae are a family of venomous snakes found all over the world, except in Antarctica, Australia, Ireland, Madagascar, Hawaii, various other isolated islands, and above the Arctic Circle. All have relatively long, hinged fangs that permit deep penetration and injection of venom. Four...

Chelidae

Chelidae

The Chelidae are one of the three living families of the turtle suborder Pleurodira and are commonly called the Austro-South American Side Neck turtles. The Family is distributed in Australia, New Guinea, parts of Indonesia and throughout most of South America. It is a large family of turtles with...

Cheloniidae

Cheloniidae

Cheloniidae is a family of turtles belonging to the sea turtle superfamily Chelonioidea.-Extant genera:*Genus Caretta**Loggerhead sea turtle *Genus Chelonia**Green sea turtle *Genus Eretmochelys...

Geoemydidae

Geoemydidae

Geoemydidae is the largest and most diverse family in the order Testudines with about 70 species. It includes the Eurasian pond and river turtles and Neotropical wood turtles.-Characteristics:...

Pelomedusidae

Pelomedusidae

Pelomedusidae is a family of freshwater turtles, native to eastern and southern Africa. They range in size from to in shell length, and are generally roundish in shape...

Podocnemididae

Podocnemididae

Podocnemididae is a family of turtles native to Madagascar and northern South America. They are side-necked turtles , which means they do not retract their heads backwards, but hide it sideways....

Testudinidae

Trionychidae

Trionychidae

Trionychidae is a taxonomic family which comprises a number of turtle genera commonly known as softshells. They are also sometimes called pancake turtles. Softshells consist of some of the world's largest fresh water turtles, though many can adapt to living in highly brackish areas. Members of this...

Acroporidae

Acroporidae

Acroporidae is a family of small polyped stony corals in the phylum Cnidaria. The name is derived from the Greek "akron" meaning "summit" and refers to the presence of a corallite at the tip of each branch of coral. They are commonly known as staghorn corals and are grown in aquaria by reef...

Dendrophylliidae

Margaritiferidae

Margaritiferidae

Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. They are known as freshwater pearl mussels, because they are capable of producing pearls.-Genera within the family Margaritiferidae:...

Unionidae

Unionidae

Unionidae is a family of freshwater mussels, the largest in the order Unionoida, the bivalve mollusks sometimes known as river mussels, naiads, or simply as unionids.The range of distribution for this family is world-wide...

Cyclophoridae

Cyclophoridae

Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the informal group Architaenioglossa belonging to the clade Caenogastropoda .- Taxonomy :This family consists of the following subfamilies according to the taxonomy of...

Diplommatinidae

Diplommatinidae

Diplommatinidae is a family of small land snails with an operculum, terrestrial gastropod mollusks in the superfamily Cyclophoridae.-Genera:*Subfamily Diplommatininae L...

Viviparidae

Viviparidae

Viviparidae, sometimes known as the river snails or mystery snails, are a family of large operculate freshwater snails, aquatic gastropod mollusks....

Helicinidae

Helicinidae

Helicinidae is a family of small tropical land snails which have an operculum. They are terrestrial operculate gastropod mollusks in the superfamily Helicinoidea....

Lymnaeidae

Lymnaeidae

Lymnaeidae is a taxonomic family of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila....

Planorbidae

Planorbidae

Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks....

Bithyniidae

Bithyniidae

Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha.Their minute shell is often colored. They are characterized by a calcareous operculum, a lobe on the upper surface of the neck. The ctenidium, the respiratory gill-comb, is...

Hydrobiidae

Hydrobiidae

Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha.- Distribution :...

Pomatiopsidae

Pomatiopsidae

Pomatiopsidae is a family of small mainly freshwater snails with gills and an operculum, aquatic gastropod mollusks in the superfamily Rissooidea ....

Pleuroceridae

Pleuroceridae

Pleuroceridae, common name pleurocerids, is a family of small to medium-sized freshwater snails, aquatic gilled gastropod mollusks in the superfamily Cerithioidea.These snails have an operculum and typically a robust high-spired shell....

Achatinellidae

Achatinellidae

Achatinellidae is a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Achatinelloidea.- Taxonomy :...

Amastridae

Amastridae

Amastridae is a taxonomic family of small, air-breathing, land snails, terrestrial pulmonate gastropod mollusks in the superfamily Cochlicopoidea....

Charopidae

Charopidae

Charopidae is a taxonomic family of small air-breathing land snails , terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea .- Subfamilies and genera :The family Charopidae consists of the following subfamilies:* Charopinae Hutton, 1884 - synonyms:...

Draparnaudiidae

Endodontidae

Endodontidae

Endodontidae is a taxonomic family of very small air-breathing land snails and slugs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea....

Enidae

Enidae

Enidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks.- Anatomy :In this family, the number of haploid chromosomes lies between 21 and 25 .- 1998 taxonomy :...

Euconulidae

Euconulidae

Euconulidae is a taxonomic family of minute, air-breathing land snails, terrestrial pulmonate gastropod mollusks or micromollusks. This land snail family is closely allied to the Zonitidae, the glass snails.- Distribution :...

Helicarionidae

Helicarionidae

Helicarionidae is a family of air-breathing land snails or semi-slugs, terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea.- Distribution :...

Helicidae

Helicidae

The Helicidae, sometimes known as the typical snails, are a taxonomic family of small to large, air-breathing, land snails. In other words, they are terrestrial pulmonate gastropod mollusks....

Helminthoglyptidae

Helminthoglyptidae

The Helminthoglyptidae are a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.This is a large and diverse group of new world snails, ranging in distribution from Alaska through North America to the West Indies, Central America, and as far...

Hygromiidae

Hygromiidae

Hygromiidae is a taxonomic family of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.-Anatomy:...

Lauriidae

Lauriidae

Lauriidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks.- Taxonomy :The Lauriidae family is classified within the informal group Orthurethra, itself belonging to the clade Stylommatophora within the clade Eupulmonata .The family Lauriidae has no...

Orthalicidae

Orthalicidae

Orthalicidae are a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks are classified in the informal group Sigmurethra of the clade Stylommatophora...

Partulidae

Partulidae

Partulidae is a family of air-breathing land snails, terrestrial gastropod mollusks in the infraorder Stylommatophora, endemic to Pacific islands.- Genera :Partulidae is divided into three genera:* Eua has four species, confined to Tonga and Samoa....

Rhytididae

Rhytididae

Rhytididae is a taxonomic family of medium-sized predatory air-breathing land snails, carnivorous terrestrial pulmonate gastropod molluscs in the superfamily Rhytidoidea.This family has no subfamilies.-Anatomy:...

Streptaxidae

Streptaxidae

Streptaxidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in theStylommatophora. Six Streptaxidae subfamilies are accepted in the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi....

Strophocheilidae

Strophocheilidae

Strophocheilidae is a taxonomic family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Acavoidea .- Subfamilies and genera :...

Vertiginidae

Vertiginidae

Vertiginidae is a family of minute, air-breathing land snails, terrestrial pulmonate gastropod molluscs or micromollusks in the superfamily Pupilloidea.- Distribution :...

Peripatopsidae

Peripatopsidae

Peripatopsidae is one of the two living velvet worm families.-Genera:* Acanthokara* Aethrikos* Aktinothele* Anoplokaros* Austroperipatus* Baeothele* Centorumis* Cephalofovea* Critolaus* Dactylothele...