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Extant is the opposite of the word extinct. It may refer to: Extant hereditary titles; Extant literature, surviving literature, such as Beowulf, the oldest extant manuscript written in English; Extant taxon, a taxon which is not extinct, such as an extant species; Extant Theatre Company, a disability arts organisation
A living fossil is a deprecated term for an extant taxon that phenotypically resembles related species known only from the fossil record. To be considered a living fossil, the fossil species must be old relative to the time of origin of the extant clade. Living fossils commonly are of species-poor lineages, but they need not be.
Clade T is a total group or pan-group, its extant species organized into crown groups C1 and C2.Within clade T are sister clades T1 and C2. Clade T1 is composed of crown group C1 and the stem group S1 which is the set of extinct species that are closer to C1 than any other crown group of extant species.
A clade is by definition monophyletic, meaning that it contains one ancestor which can be an organism, a population, or a species and all its descendants. [note 1] [10] [11] The ancestor can be known or unknown; any and all members of a clade can be extant or extinct.
Homo (from Latin homÅ ' human ') is a genus of great ape (family Hominidae) that emerged from the genus Australopithecus and encompasses only a single extant species, Homo sapiens (modern humans), along with a number of extinct species (collectively called archaic humans) classified as either ancestral or closely related to modern humans; these include Homo erectus and Homo neanderthalensis.
Extant is an American science fiction drama television series created by Mickey Fisher and, as executive producer, Steven Spielberg. The story revolves around astronaut Molly Woods ( Halle Berry ) [ 1 ] who returns home to her family inexplicably pregnant after 13 months in outer space on a solo mission.
Extinction of a parent species where daughter species or subspecies are still extant is called pseudoextinction or phyletic extinction. Effectively, the old taxon vanishes, transformed ( anagenesis ) into a successor, [ 29 ] or split into more than one ( cladogenesis ).
absolute age The age of an object with reference to a fixed and specific time scale, as determined by some method of absolute dating, e.g. 10,000 BP or 1.9 mya. [1]absolute dating