Sinanthropus

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Illustration of Peking Man Illustration of Peking Man (Sinanthropus Pekinen Sis) Wellcome M0001113.jpg
Illustration of Peking Man

Sinanthropus (from Sino-, "China", and anthro-, "man") is an archaic genus in the scientific classification system to which the early hominid fossils of Peking man, Lantian Man, Nanjing Man, and Yuanmou Man were once assigned. All of them have now been reclassified as Homo erectus , and the genus Sinanthropus is disused. [1] Beginning in the year 1928 to the year 1937, 14 fragmented skulls belonging to the hominids were found in various locations in China. [2] Peking and Chou K’ou-tien are two notable places with fossils found. It has been noted by researchers that it is likely that the found fragmented skulls were brought to the cave after being severed from the bodies they belonged to. [3] This is very likely, because most of the found pieces are teeth and jaws. Some skulls are missing large parts which indicates separation before they were fossilized, not the loss of pieces due to fossilization process. [3]

Contents

Sinanthropus contained four species:

Homo erectus pekinensis Modell von Sinanthropus (Peking-Mensch) (3).jpg
Homo erectus pekinensis

Discovery

Of the four species placed within the genus Sinanthropus, the first to be found were remnants of the Peking man (Sinanthropus pekinensis). The first fossil was retrieved by Otto Zdansky (1894-1988) near the village of Chou K'ou-tien (China) after the Swedish Geologist and Archaeologist Johan Gunnar Andersson (1874-1960) and his colleagues instigated the excavations at the beginning of the 1920's. Many more finds would follow. The Canadian Davidson Black (1884-1934) was the first to identify the fossils as a new hominid genus, Sinanthropus. A substantial part of the originally discovered remains of the Peking man was lost during WWII, when the fossils were transferred to the United States. [4]

After the discovery of the Peking Man remnants, other fossils were found which were classified within the genus Sinanthropus. The discovery of the fossils following up the ones of the Peking man were the remnants of the Lantian man in 1963 and consequently the fossils of the Yuanmou man in 1965 and Nanjing man in 1993. The fossils of the Peking man were the most abundant compared to the other species within Sinanthropus with bones belonging to around 40 individuals. [5] From the Lantian man, a mandible and cranium were found, [6] from the Yuanmou man only two incisors [7] and the fossil record of the Nanjing man consists out of two skulls. [8] Because of the variety in different body parts found at the Chou K'ou-tien excavation site, the traumas which some of the remains suffered, and the incompleteness of some of the skeletons, Henri Breuil (1877-1961) suggested in 1929 that Sinanthropus species were cannibalistic. Opposing the cannibalism theory, the idea was raised that the damage on the remains could be the result of animal scavenging, most probably by the Hyena. A study performed in 2001 showed strong evidence for the animal scavenging theory by linking damage done to the bones to Hyena bite-marks. [9]

After the discovery of Sinanthropus pekinensis, Davidson Black first concluded that the found hominid could be the missing link in the discovery of human evolution. Black stated that Sinanthropus supported the theory that mankind originated in central Asia. However, in 1943 Franz Weidenreich (1873-1948) suggested that Sinanthropus could be the ancestor of the modern Chinese, due to their resemblance in facial characters. Nowadays, both theories are seen as invalid and the “Out of Africa” theory is seen as the most likely, stating that all humans originated from a common African ancestor. [10]

Features

In accordance with the findings of the systematic studies on the fossils, Sinanthropus holds the following phenotypic features. Sinanthropus had an erect posture with similar limbs and trunk to those of modern man but had a different face and head characteristics. The average cranial capacity is assessed to be 1,075cc, which is considerably smaller than the size of the brain of modern humans (1350cc). The facial structure included an extremely broad face, cheekbones which were sharply angled and frontally orientated, a low forehead, enormous eyebrow bones (supraorbital ridges) which protruded forward, broad nasal bones, and big teeth. The stature of Sinanthropus was calculated by Weidenreich to be 156 cm for males and 144 cm for females. This contrasts the claims of Soviet anthropologists, who suggested a higher stature, namely 162 cm for males and 152 cm for females. [5] More specificities described by researchers indicated that Sinanthropus had a different jaw than found in gorillas, similar cranial size to Pithecanthropus , and smaller molars than those found in Pithecanthropus. [11] Researchers were also able to conclude that the teeth found were larger in comparison to Neanderthal men found at the time and the upper canine was long, wide, and similar to that of a tusk. [3] At the time, the genus Sinanthropus was distinguished by the massiveness of the bone fragments that were found. [12] The difference in teeth size created variability among the genus.

Controversy

In the 1930s, papers were published regarding the Sinanthropus and they sought to examine the new hominids and their similar features to other discovered hominids. Dr. Weidenreich was a well-known contributor who was also received blame for a controversy surrounding Sinanthropus. He wrote a research paper about the similarities found in Sinanthropus and Pithecanthropus, where he mentioned the cranial size, jaw proportions and teeth size. [11] Another researcher took an opposing stand and stated that Sinanthropus was “clearly Neanderthaloid”. [2] These two conversations may be responsible for sparking the question revolving if Sinanthropus was even to be considered a genus. [2]

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<span class="mw-page-title-main">Davidson Black</span> Canadian anthropologist

Davidson Black, FRS was a Canadian paleoanthropologist, best known for his naming of Sinanthropus pekinensis. He was Chairman of the Geological Survey of China and a Fellow of the Royal Society. He was known as 步達生 in China.

<span class="mw-page-title-main">Peking Man</span> Subspecies of the genus Homo (fossil)

Peking Man is a subspecies of H. erectus which inhabited the Zhoukoudian cave site in modern northern China during the Chibanian. The first fossil, a tooth, was discovered in 1921, and the Zhoukoudian Cave has since then become the most productive H. erectus site in the world. Peking Man was instrumental in the foundation of Chinese anthropology, and fostered an important dialogue between Western and Eastern science for decades to come. The fossils became the centre of anthropological discussion, and were classified as a direct human ancestor, propping up the Out of Asia hypothesis that humans evolved in Asia. Peking Man also played a vital role in the restructuring of the Chinese identity following the Chinese Communist Revolution, and was intensively communicated to working class and peasant communities to introduce them to Marxism and science. Early models of Peking Man society strongly leaned towards communist or nationalist ideals, leading to discussions on primitive communism and polygenism. This produced a strong schism between Western and Eastern interpretations, especially as the West adopted the Out of Africa hypothesis by late 1967, and Peking Man's role in human evolution diminished as merely an offshoot of the human line. Though Out of Africa is now the consensus, Peking Man interbreeding with human ancestors is frequently discussed especially in Chinese circles.

<i>Meganthropus</i> Hominin fossil

Meganthropus is an extinct genus of non-hominin hominid ape, known from the Pleistocene of Indonesia. It is known from a series of large jaw and skull fragments found at the Sangiran site near Surakarta in Central Java, Indonesia, alongside several isolated teeth. The genus has a long and convoluted taxonomic history. The original fossils were ascribed to a new species, Meganthropus palaeojavanicus, and for a long time was considered invalid, with the genus name being used as an informal name for the fossils.

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<i>Homo</i> Genus of hominins that includes humans and their closest extinct relatives

Homo is the genus that emerged from the genus Australopithecus and encompasses the extant species Homo sapiens and several extinct species classified as either ancestral to or closely related to modern humans, including Homo erectus and Homo neanderthalensis. The oldest member of the genus is Homo habilis, with records of just over 2 million years ago. Homo, together with the genus Paranthropus, is probably sister to Australopithecus africanus, which itself had split from the lineage of Pan, the chimpanzees.

Paleoanthropology or paleo-anthropology is a branch of paleontology and anthropology which seeks to understand the early development of anatomically modern humans, a process known as hominization, through the reconstruction of evolutionary kinship lines within the family Hominidae, working from biological evidence and cultural evidence.

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<span class="mw-page-title-main">Zhoukoudian Peking Man Site</span> Cave complex and archaeological site in China

Zhoukoudian Peking Man Site (周口店北京人遗址), also romanized as Choukoutien, is a cave system in suburban Fangshan District, Beijing. It has yielded many archaeological discoveries, including one of the first specimens of Homo erectus, dubbed Peking Man, and a fine assemblage of bones of the gigantic hyena Pachycrocuta brevirostris.

<span class="mw-page-title-main">Gustav Heinrich Ralph von Koenigswald</span> German-Dutch paleontologist and geologist (1902–1982)

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<span class="mw-page-title-main">Lantian Man</span> Subspecies of the genus Homo (fossil)

Lantian Man, Homo erectus lantianensis) is a subspecies of Homo erectus known from an almost complete mandible from Chenchiawo (陈家窝) Village discovered in 1963, and a partial skull from Gongwangling (公王岭) Village discovered in 1964, situated in Lantian County on the Loess Plateau. The former dates to about 710–684 thousand years ago, and the latter 1.65–1.59 million years ago. This makes Lantian Man the second-oldest firmly dated H. erectus beyond Africa, and the oldest in East Asia. The fossils were first described by Woo Ju-Kan in 1964, who considered the subspecies an ancestor to Peking Man.

<span class="mw-page-title-main">Yuanmou Man</span> Subspecies of Homo erectus

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<span class="mw-page-title-main">Anthropopithecus</span> Obsolete primate taxon

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Hu Chengzhi was a Chinese paleontologist and paleoanthropologist. He made the plaster casts of the Peking Man skull in the 1930s, and identified the Yuanmou Man based on fossils collected by others. He discovered the first fossil of Keichousaurus in 1957, and this species, K. hui, is named after him. A new hadrosaur discovered in Shandong is designated Shantungosaurusgiganteus by Hu in 1973.

The Narmada Human, originally the Narmada Man, is a species of extinct human that lived in central India during the Middle and Late Pleistocene. From a skull cup discovered from the bank of Narmada River in Madhya Pradesh in 1982, the discoverer, Arun Sonakia classified it was an archaic human and gave the name Narmada Man, with the scientific name H. erectus narmadensis. Analysis of additional fossils from the same location in 1997 indicated that the individual could be a female, hence, a revised name, Narmada Human, was introduced. It remains the oldest human species in India.

References

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  3. 1 2 3 Weidenreich, Franz (2009-05-29). "The Sinanthropus Population of Choukoutien (Locality 1) with a Preliminary Report on New Discoveries: Weidenreich- Sinanthropus Population of Choukoutien". Bulletin of the Geological Society of China. 14 (4): 427–468. doi:10.1111/j.1755-6724.1935.mp14004001.x.
  4. Shapiro, H.L. (April 7, 2014). "Peking Man, The Discovery, Disappearance and Mystery of a Priceless Scientific Treasure" (PDF). Retrieved September 17, 2020.
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  6. Aigner, J.S.; Laughlin, W.S. (1973). "The Dating of Lantian Man and His Significance for Analyzing Trends in Human Evolution". American Journal of Physical Anthropology. 39 (1): 97–110. doi:10.1002/ajpa.1330390111. PMID   4351579.
  7. Cheng-Chih, H. (1973). "Ape-man teeth from Yuanmou, Yunnan". Acta Geological Sinica.
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  9. Boaz, N.T.; Ciochon, R.L. (2001). "The Scavenging of 'Peking Man'". Natural History. 110: 46–51.
  10. Wang, Q.; Sun, L. (2000). "Eightieth year of Peking Man: current state of Peking man and the Zhoukoudian site". Anthropological Review. 63: 19–30. doi: 10.18778/1898-6773.63.02 . S2CID   161385216.
  11. 1 2 Von Koenigswald, G. H. R.; Bandoeng; Weidenreich, Franz (1939). "The Relationship between Pithecanthropus and Sinanthropus". Nature. 144 (3657): 926–929. Bibcode:1939Natur.144..926V. doi: 10.1038/144926a0 . ISSN   0028-0836.
  12. Hooton, E. A. (1944). "The skull of Sinanthropus pekinensis; A comparative study on a primitive hominid skull. By Franz Weidenreich. Palaeontologica Sinica, New Series D. no. 10, Whole Series no. 127, 1943, xxi + 298 pp., 38 tables, 93 figures, 245 references, index". American Journal of Physical Anthropology. 2 (3): 317–319. doi:10.1002/ajpa.1330020308. ISSN   0002-9483.