Ardipithecus is a very early hominid genus (subfamily Homininae). Because it is much like the African apes (genus Pan and genus Gorilla), it is considered by some to be on the chimpanzee rather than human branch, but most consider it a proto-human because of a likeness in teeth with Australopithecus. Ardipithecus lived 4.4 million years ago in the early Pliocene. Genera Subfamily Ponginae Pongo - Orangutans Gigantopithecus (extinct) Sivapithecus (extinct) Lufengpithecus (extinct) Ankarapithecus (extinct) Subfamily Homininae Gorilla - Gorillas Pan - Chimpanzees Homo - Humans Dryopithecus (extinct) Ouranopithecus (extinct) Paranthropus (extinct) Australopithecus (extinct) Sahelanthropus (extinct) Orrorin (extinct) Ardipithecus (extinct) Kenyanthropus (extinct) Pierolapithecus (extinct) (tentative) The hominids are the members of the biological family Hominidae... In biology, a genus (plural genera) is a grouping in the classification of living organisms having one or more related and morphologically similar species. ... ... Genera Gorilla Pan (chimpanzees) Homo (humans) Paranthropus (extinct) Australopithecus (extinct) Sahelanthropus (extinct) Ardipithecus (extinct) Kenyanthropus (extinct) Homininae is a subfamily of Hominidae, including Homo sapiens and some extinct relatives, as well as the gorillas and the chimpanzees. ... Type species Simia troglodytes Blumenbach, 1775 Species Pan troglodytes Pan paniscus Chimpanzee, often abbreviated to chimp, is the common name for two species in the genus Pan. ... Type species Troglodytes gorilla Savage, 1847 Species Gorilla gorilla Gorilla beringei Distinguish from guerilla. ... Type species Simia troglodytes Blumenbach, 1775 Species Pan troglodytes Pan paniscus Chimpanzee, often abbreviated to chimp, is the common name for two species in the genus Pan. ... Binomial name Homo sapiens Linnaeus, 1758 Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens Human beings define themselves in biological, social, and spiritual terms. ... Species Homo erectus (extinct) Homo ergaster (extinct) Homo floresiensis (extinct) Homo habilis (extinct) Homo heidelbergensis (extinct) Homo neanderthalensis (extinct) Homo rudolfensis (extinct) Homo sapiens Homo is the genus that includes humans and their close relatives. ... Species A. afarensis (Lucy) Formerly Australopithecus, now Paranthropus Australopithecines (genus Australopithecus) are a group of extinct Hominids that are closely related to humans. ... The Pliocene epoch (a. ...

Two species have been described, Ardipithecus ramidus and Ardipithecus kadabba. The latter was initially described as a subspecies of A. ramidus, but on the basis of teeth recently discovered in Ethiopia has been raised to species rank. The canine teeth show primitive features that distinguish them from those of more recent hominines. A. kadabba is believed to be the earliest organism yet identified that lies in the human line following its split from the lineage that gave rise to the two modern chimpanzee species. In biology, the most commonly used definition of species was first coined by Ernst Mayr. ... In taxonomy, a subspecies is the taxon immediately subordinate to a species. ... The Canine teeth are the long, pointed teeth used for grabbing hold of and tearing apart foods, also called cuspids, dogteeth or fangs. Species that feature them, such as humans and dogs, usually have four, two in the top jaw, two in the lower, on either side of the Incisors. ...

On the basis of bone sizes, Ardipithecus species are believed to have been about the size of a modern chimpanzee. The toe structure of A. ramidus suggests that the creature walked upright, and this poses problems for current theories of the origins of hominid bipedalism: Ardipithecus is believed to have lived in shady forests rather than on the savannah, where the faster running permitted by bipedalism would have been an advantage. A biped is an animal that travels across surfaces supported by two legs. ...

External link

• BBC News: Amazing hominid haul in Ethiopia