| Scanochiton | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Polyplacophora |
| Order: | † Paleoloricata |
| Family: | † Scanochitonidae |
| Genus: | † Scanochiton AG Smith, 1973 |
| Species [2] | |
†Scanochiton jugatus | |
Scanochiton is an extinct genus of polyplacophoran molluscs. Scanochiton became extinct during the Cretaceous period. [1]
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" after a period of apparent absence.
The biological subfamily Bovinae includes a diverse group of 10 genera of medium to large-sized ungulates, including domestic cattle, bison, African buffalo, the water buffalo, and the four-horned and spiral-horned antelopes. The evolutionary relationship between the members of the group is still debated, and their classification into loose tribes rather than formal subgroups reflects this uncertainty. General characteristics include cloven hooves and usually at least one of the sexes of a species having true horns. The largest extant bovine is the gaur.
Tortoises are reptile species of the family Testudinidae of the order Testudines. They are particularly distinguished from other turtles by being land-dwelling, while many other turtle species are at least partly aquatic. Like other turtles, tortoises have a shell to protect from predation and other threats. The shell in tortoises is generally hard, and like other members of the suborder Cryptodira, they retract their necks and heads directly backwards into the shell to protect them.
A wide variety of languages are spoken throughout Asia, comprising different language families and some unrelated isolates. The major language families include Altaic, Austroasiatic, Austronesian, Caucasian, Dravidian, Indo-European, Afroasiatic, Siberian, Sino-Tibetan and Kra–Dai. Most, but not all, have a long history as a written language.
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red Lists are produced by countries or organizations, which assess the risk of extinction to species within a political management unit.
An extinct language is a language that no longer has any speakers, especially if the language has no living descendants. In contrast, a dead language is "one that is no longer the native language of any community", even if it is still in use, like Latin. Languages that currently have living native speakers are sometimes called modern languages to contrast them with dead languages, especially in educational contexts.
The Chibchan languages make up a language family indigenous to the Isthmo-Colombian Area, which extends from eastern Honduras to northern Colombia and includes populations of these countries as well as Nicaragua, Costa Rica, and Panama. The name is derived from the name of an extinct language called Chibcha or Muysccubun, once spoken by the people who lived on the Altiplano Cundiboyacense of which the city of Bogotá was the southern capital at the time of the Spanish Conquista. However, genetic and linguistic data now indicate that the original heart of Chibchan languages and Chibchan-speaking peoples may not have been in Colombia at all, but in the area of the Costa Rica-Panama border, where one finds the greatest variety of Chibchan languages.
The following are lists of extinct animals:
The Pterygota are a subclass of insects that includes the winged insects. It also includes insect orders that are secondarily wingless.
The Cariban languages are a family of languages indigenous to northeastern South America. They are widespread across northernmost South America, from the mouth of the Amazon River to the Colombian Andes, and they are also spoken in small pockets of central Brazil. The languages of the Cariban family are relatively closely related. There are about three dozen of them, but most of them are only spoken by a few hundred people—the only one with more than a few thousand speakers is Macushi, which has 30,000. The Cariban family is well known among linguists partly because one language in the family—Hixkaryana—has a default word order of object–verb–subject, which had previously been believed to not exist in any spoken natural language.
The Tipulomorpha are an infraorder of Nematocera, containing the crane flies, a very large group, and allied families.
The Bibionomorpha are an infraorder of the suborder Nematocera. One of its constituent families, the Anisopodidae, is the presumed sister taxon to the entire suborder Brachycera. Several of the remaining families in the infraorder are former subfamilies of the Mycetophilidae, which has been recently subdivided. The family Axymyiidae has recently been removed from the Bibionomorpha to its own infraorder Axymyiomorpha.
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.
Neontology is a part of biology that, in contrast to paleontology, deals with living organisms. It is the study of extant taxa : taxa with members still alive, as opposed to (all) being extinct. For example:
Arawakan, also known as Maipurean, is a language family that developed among ancient indigenous peoples in South America. Branches migrated to Central America and the Greater Antilles in the Caribbean and the Atlantic, including what is now the Bahamas. Among South American countries, only present-day Ecuador, Uruguay, and Chile have never had peoples who spoke Arawakan languages. Maipurean may be related to other language families in a hypothetical Macro-Arawakan stock.
A critically endangered (CR) species is one that has been categorized by the International Union for Conservation of Nature (IUCN) as facing an extremely high risk of extinction in the wild.
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.
An extinct comet is a comet that has expelled most of its volatile ice and has little left to form a tail and coma. In a dormant comet, rather than being depleted, any remaining volatile components have been sealed beneath an inactive surface layer.
De-extinction, also known as resurrection biology, or species revivalism, is the process of generating an organism that is either an extinct species or resembles an extinct species. There are several ways to carry out the process of de-extinction. Cloning is the most widely proposed method, although genome editing and selective breeding have also been considered. Similar techniques have been applied to certain endangered species, in hopes to boost populations. The only method of the three that would provide an animal with the same genetic identity is cloning. There are both pros and cons to the process of de-extinction ranging from technological advancements to ethical issues.
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