Australopithecine
The australopithecines (/ɔːˈstreɪloʊˈpɪθəsaɪnz/), formally Australopithecina or Hominina, are generally any species in the related genera of Australopithecus and Paranthropus. It may also include members of Kenyanthropus, Ardipithecus, and Praeanthropus. The term comes from a former classification as members of a distinct subfamily, the Australopithecinae. They are classified within the Australopithecina subtribe of the Hominini tribe. These related species are sometimes[dubious – discuss] collectively termed australopithecines, australopiths, or homininians. They are the extinct, close relatives of modern humans and, together with the extant genus Homo, comprise the human clade. There is no general agreement to whether australopithecines are closest relatives of modern humans, as it has been argued that they are more closely related to extant African apes. Members of the human clade, i.e. the Hominini after the split from the chimpanzees, are called Hominina (see Hominidae; terms "hominids" and hominins).
While none of the groups normally directly assigned to this group survived, the australopithecines do not appear to be literally extinct (in the sense of having no living descendants) as the genera Kenyanthropus, Paranthropus, and Homo probably emerged as sisters of a late Australopithecus species such as A. africanus and/or A. sediba.
The terms australopithecines, et. al., come from a former classification as members of a distinct subfamily, the Australopithecinae. Members of Australopithecus are sometimes referred to as the "gracile australopithecines", while Paranthropus are called the "robust australopithecines".
The australopithecines occurred in the Late Miocene sub-epoch and were bipedal, and they were dentally similar to humans, but with a brain size not much larger than that of modern non-human apes, with lesser encephalization than in the genus Homo. Humans (genus Homo) may have descended from australopithecine ancestors and the genera Ardipithecus, Orrorin, Sahelanthropus, and Graecopithecus are the possible ancestors of the australopithecines.
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Classification
Classification of subtribe Australopithecina according to Briggs & Crowther 2008, p. 124.
- Australopithecina
- Australopithecus
- Australopithecus africanus
- Australopithecus deyiremeda
- Australopithecus garhi
- Australopithecus sediba
- Australopithecus afarensis (=Praeanthropus afarensis)
- Australopithecus anamensis (=Praeanthropus anamensis)
- Australopithecus bahrelghazali (=Praeanthropus bahrelghazali)
- Paranthropus
- Ardipithecus
- Orrorin
- Sahelanthropus
- Australopithecus
Phylogeny
Phylogeny of Hominina/Australopithecina according to Dembo et al. (2016).
Physical characteristics
The post-cranial remains of australopithecines show they were adapted to bipedal locomotion, but did not walk identically to humans. They had a forearm to upper arm ratio similar to the Golden Ratio – greater than other hominins. They exhibited greater sexual dimorphism than members of Homo or Pan but less so than Gorilla or Pongo. It is thought that they averaged heights of 1.2–1.5 metres (3.9–4.9 ft) and weighed between 30 and 55 kilograms (66 and 121 lb). The brain size may have been 350 cc to 600 cc. The postcanines (the teeth behind the canines) were relatively large, and had more enamel compared to contemporary apes and humans, whereas the incisors and canines were relatively small, and there was little difference between the males' and females' canines compared to modern apes.
Relation to Homo
Most scientists maintain that the genus Homo emerged in Africa within the australopithecines around two million years ago. However, there is no consensus on within which species:
Marc Verhaegen has argued that an australopithecine species could have also been ancestral to the genus Pan (i.e. chimpanzees).
Asian australopithecines
A minority view among palaeoanthropologists is that australopithecines moved outside Africa. One proponent of this theory is Jens Lorenz Franzen, formerly Head of Paleoanthropology at the Research Institute Senckenberg. Franzen argued that robust australopithecines had reached not only Indonesia, as Meganthropus, but also China:
In 1957, an Early Pleistocene Chinese fossil tooth of unknown province was described as resembling P. robustus. Three fossilized molars from Jianshi, China (Longgudong Cave) were later identified as belonging to an Australopithecus species. However further examination questioned this interpretation; Zhang (1984) argued the Jianshi teeth and unidentified tooth belong to H. erectus. Liu et al. (2010) also dispute the Jianshi–australopithecine link and argue the Jianshi molars fall within the range of Homo erectus:
However, Wolpoff (1999) notes that in China "persistent claims of australopithecine or australopithecine-like remains continue".
See also
Notes
References
- Briggs, D.; Crowther, P. R., eds. (2008). Palaeobiology II. John Wiley & Sons. p. 600. ISBN 9780470999288.
- Cela-Conde, C. J.; Ayala, F. J. (2003). "Genera of the human lineage". Proceedings of the National Academy of Sciences. 100 (13): 7684–7689. Bibcode:2003PNAS..100.7684C. doi:10.1073/pnas.0832372100. PMC 164648. PMID 12794185.
- Franzen, J. L. (1985). "Asian australopithecines?". Hominid Evolution: Past, Present, and Future. New York: Wiley-Liss. pp. 255–263.
- Gao, J (1975). "Australopithecine teeth associated with Gigantopithecus". Vertebrata PalAsiatica. 13 (2): 81–88.
- Kottak, C. P. (2004). "Glossary". Cultural Anthropology: The Exploration of Human Diversity (10th ed.). McGraw-Hill. ISBN 978-0072832259. Archived from the original on 18 July 2013. Retrieved 26 March 2013.
- Liu, Wu; Clarke, Ronald; Xing, Song (2010). "Geometric morphometric analysis of the early Pleistocene hominin teeth from Jianshi, Hubei Province, China". Science China Earth Sciences. 53 (8): 1141–1152. Bibcode:2010ScChD..53.1141L. doi:10.1007/s11430-010-4013-0. S2CID 129711769.
- Mai, L. L.; Owl, M. Y.; Kersting, M. P. (2005). The Cambridge Dictionary of Human Biology and Evolution. Cambridge & New York: Cambridge University Press. p. 45. ISBN 978-0-521-66486-8.
- Stanford, C. B. (2012). "Chimpanzees and the behavior of Ardipithecus ramidus". Annual Review of Anthropology. 41: 139–149. doi:10.1146/annurev-anthro-092611-145724.
- Wood, B. (2010). "Reconstructing human evolution: Achievements, challenges, and opportunities". Proceedings of the National Academy of Sciences. 107 (Suppl 2): 8902–8909. doi:10.1073/pnas.1001649107. PMC 3024019. PMID 20445105.
- Wood, B.; Richmond, B. G. (2000). "Human evolution: Taxonomy and paleobiology". Journal of Anatomy. 197 (Pt 1): 19–60. doi:10.1046/j.1469-7580.2000.19710019.x. PMC 1468107. PMID 10999270.
- Wolpoff, M. H. (1999). Paleoanthropology. New York: McGraw-Hill.
- Zhang, Y. (1985). "Gigantopithecus and Australopithecus in China". Palaeoanthropology and palaeolithic archaeology in the People's Republic of China. pp. 69–78.
External links
Media related to Hominina at Wikimedia Commons
- Informative lecture on Australopithecines