Evolution of primates

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Phylogenetic tree of the primates

The evolutionary history of the primates can be traced back 65 million years.[1] One of the oldest known primate-like mammal species, the Plesiadapis, came from North America;[2] another, Archicebus, came from China.[3] Other similar basal primates were widespread in Eurasia and Africa during the tropical conditions of the Paleocene and Eocene. Purgatorius is the genus of the four extinct species believed to be the earliest example of a primate or a proto-primate, a primatomorph precursor to the Plesiadapiformes, dating to as old as 66 million years ago.

Notharctus

David Begun[4] concluded that early primates flourished in Eurasia and that a lineage leading to the African apes and humans, including Dryopithecus, migrated south from Europe or Western Asia into Africa. The surviving tropical population of primates, which is seen most completely in the upper Eocene and lowermost Oligocene fossil beds of the Faiyum depression southwest of Cairo, gave rise to all living species—lemurs of Madagascar, lorises of Southeast Asia, galagos or "bush babies" of Africa, and the anthropoids: platyrrhine or New World monkeys, catarrhines or Old World monkeys, and the great apes, which share common ancestors with Homo sapiens.

The earliest known catarrhine is Kamoyapithecus from uppermost Oligocene at Eragaleit in the northern Kenya Rift Valley, dated to 24 million years ago.[5] Its ancestry is thought to be species related to Aegyptopithecus, Propliopithecus, and Parapithecus from the Fayum, at around 35 million years ago.[6] In 2010, Saadanius was described as a close relative of the last common ancestor of the crown catarrhines, and tentatively dated to 29–28 million years ago, helping to fill an 11-million-year gap in the fossil record.[7] Notable species also include Nsungwepithecus gunnelli and Rukwapithecus fleaglei, dubiously taxonomized catarrhines of the Oligocene.[8]

Reconstructed tailless Proconsul skeleton

In the early Miocene, about 22 million years ago, the many kinds of arboreally adapted primitive catarrhines from East Africa suggest a long history of prior diversification. Fossils at 20 million years ago include fragments attributed to Victoriapithecus, the earliest Old World Monkey. Among the genera thought to be in the ape lineage leading up to 13 million years ago are Proconsul, Rangwapithecus, Dendropithecus, Limnopithecus, Nacholapithecus, Equatorius, Nyanzapithecus, Afropithecus, Heliopithecus, and Kenyapithecus, all from East Africa.

The presence of other generalized non-cercopithecids of middle Miocene age from sites far distant—Otavipithecus from cave deposits in Namibia, and Pierolapithecus and Dryopithecus from France, Spain and Austria—is evidence of a wide diversity of forms across Africa and the Mediterranean basin during the relatively warm and equable climatic regimes of the early and middle Miocene. The youngest of the Miocene hominoids, Oreopithecus, is from coal beds in Italy that have been dated to 9 million years ago.

Molecular evidence indicates that the lineage of gibbons (family Hylobatidae) diverged from Great Apes some 18-12 million years ago, and that of orangutans (subfamily Ponginae) diverged from the other Great Apes at about 12 million years; there are no fossils that clearly document the ancestry of gibbons, which may have originated in a so-far-unknown South East Asian hominoid population, but fossil proto-orangutans may be represented by Sivapithecus from India and Griphopithecus from Turkey, dated to around 10 million years ago.[9]

Evolution of lemurs[edit]

Lemurs, in the suborder Strepsirrhini, had been isolated on the island of Madagascar between 42 and 50 mya, allowing for their independent evolution.

Human evolution[edit]

Human evolution is the evolutionary process that led to the emergence of anatomically modern humans, beginning with the evolutionary history of primates – in particular genus Homo – and leading to the emergence of Homo sapiens as a distinct species of the hominid family, the great apes. This process involved the gradual development of traits such as human bipedalism and language.[10]

The study of human evolution involves many scientific disciplines, including physical anthropology, primatology, archaeology, paleontology, neurobiology, ethology, linguistics, evolutionary psychology, embryology and genetics.[11] Genetic studies show that primates diverged from other mammals about 85 million years ago, in the Late Cretaceous period, and the earliest fossils appear in the Paleocene, around 55 million years ago.[12]

Within the Hominoidea (apes) superfamily, the Hominidae family diverged from the Hylobatidae (gibbon) family some 15–20 million years ago; African great apes (subfamily Homininae) diverged from orangutans (Ponginae) about 14 million years ago; the Hominini tribe (humans, Australopithecines and other extinct biped genera, and chimpanzee) parted from the Gorillini tribe (gorillas) between 9 million years ago and 8 million years ago; and, in turn, the subtribes Hominina (humans and biped ancestors) and Panina (chimps) separated about 7.5 million years ago to 5.6 million years ago.[13]

Evolution of color vision[edit]

Evolution of the pelvis[edit]

In primates, the pelvis consists of four parts - the left and the right hip bones which meet in the mid-line ventrally and are fixed to the sacrum dorsally and the coccyx. Each hip bone consists of three components, the ilium, the ischium, and the pubis, and at the time of sexual maturity these bones become fused together, though there is never any movement between them. In humans, the ventral joint of the pubic bones is closed.

The most striking feature of evolution of the pelvis in primates is the widening and the shortening of the blade called the ilium. Because of the stresses involved in bipedal locomotion, the muscles of the thigh move the thigh forward and backward, providing the power for bi-pedal and quadrupedal locomotion.[14]

See also[edit]

References[edit]

  1. ^ Maxwell 1984, p. 296
  2. ^ Rose, Kenneth D. (1994). "The earliest primates". Evolutionary Anthropology: Issues, News, and Reviews. Hoboken, NJ: John Wiley & Sons. 3 (5): 159–173. doi:10.1002/evan.1360030505. ISSN 1060-1538. 
  3. ^ Wilford, J. N. (June 5, 2013). "Palm-size fossil resets primates' clock, scientists say". The New York Times. Retrieved June 5, 2013. 
  4. ^ Kordos, László; Begun, David R. (January 2001). "Primates from Rudabánya: allocation of specimens to individuals, sex and age categories". Journal of Human Evolution. Amsterdam, the Netherlands: Elsevier. 40 (1): 17–39. doi:10.1006/jhev.2000.0437. ISSN 0047-2484. PMID 11139358. 
  5. ^ Cameron 2004, p. 76
  6. ^ Wallace 2004, p. 240
  7. ^ Zalmout, Iyad S.; Sanders, William J.; MacLatchy, Laura M.; et al. (15 July 2010). "New Oligocene primate from Saudi Arabia and the divergence of apes and Old World monkeys". Nature. London: Nature Publishing Group. 466 (7304): 360–364. Bibcode:2010Natur.466..360Z. doi:10.1038/nature09094. ISSN 0028-0836. PMID 20631798. 
  8. ^ Palmer, Chris (2013-05-16). "Fossils Indicate Common Ancestor for Old World Monkeys and Apes". Scientific American. Retrieved 2017-09-13. 
  9. ^ Srivastava 2009, p. 87
  10. ^ Brian K. Hall; Benedikt Hallgrímsson (2011). Strickberger's Evolution. Jones & Bartlett Publishers. p. 488. ISBN 978-1-4496-6390-2. 
  11. ^ Heng, Henry H. Q. (May 2009). "The genome-centric concept: resynthesis of evolutionary theory". BioEssays. Hoboken, NJ: John Wiley & Sons. 31 (5): 512–525. doi:10.1002/bies.200800182. ISSN 0265-9247. PMID 19334004. 
  12. ^ Tyson, Peter (July 1, 2008). "Meet Your Ancestors". NOVA scienceNOW. PBS; WGBH Educational Foundation. Retrieved 2015-04-18. 
  13. ^ Dawkins 2004
  14. ^ Campbell 1998, p. 170

Bibliography[edit]

Further reading[edit]

External links[edit]