Overview

Brief Summary

Where Lived: Northern, Eastern, and Southern Africa; Western Asia (Dmanisi, Republic of Georgia); East Asia (China and Indonesia)

When Lived: Between about 1.89 million and 143,000 years ago

Early African Homo erectus fossils (sometimes called Homo ergaster) are the oldest known early humans to have possessed modern human-like body proportions with relatively elongated legs and shorter arms compared to the size of the torso. These features are considered adaptations to a life lived on the ground, indicating the loss of earlier tree-climbing adaptations, with the ability to walk and possibly run long distances. Compared with earlier fossil humans, note the expanded braincase relative to the size of the face. The most complete fossil individual of this species is known as the ‘Turkana Boy’ – a well-preserved skeleton (though minus almost all the hand and foot bones), dated around 1.6 million years old. Microscopic study of the teeth indicates that he grew up at a growth rate similar to that of a great ape. There is fossil evidence that this species cared for old and weak individuals. The appearance of Homo erectus in the fossil record is often associated with the earliest handaxes, the first major innovation in stone tool technology.

Early fossil discoveries from Java (beginning in the 1890s) and China (‘Peking Man’, beginning in the 1920s) comprise the classic examples of this species. Generally considered to have been the first species to have expanded beyond Africa, Homo erectus is considered a highly variable species, spread over two continents (it's not certain whether it reached Europe), and possibly the longest lived early human species - about nine times as long as our own species, Homo sapiens, has been around!

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Physical Description

Size

Height:

Ranges from 4 ft 9 in - 6 ft 1 in (145 - 185 cm)

Weight:

Ranges from 88 - 150 lbs (40 - 68 kg)

Height & Weight Supplemental Information:

There was a large amount of variation in the size of Homo erectus individuals. Many fossils cannot be attributed to male or female, so we present the entire size range here. The fossils from Africa indicate a larger body size than those from China, Indonesia, and the Republic of Georgia.

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Type Information

Key Fossils

D3444

Site: Dmanisi, Republic of Georgia

Discovered by: A team led by David Lordkipanidze

Age: About 1.77 million years old

Species: Homo erectus

Old timer

This elderly male belonged to a population of Homo erectus that spread from Africa to the Caucasus Mountains in western Asia. Most of his teeth fell out long before he died, and his jaw deteriorated as a result. Members of his social group must have taken care of him. This is some of the earliest known evidence for this kind of group care and compassion in the human fossil record.

3-D collection link: http://humanorigins.si.edu/evidence/3d-collection/f-d3444

KNM-ER 1808

Site: Koobi Fora, Kenya

Date of discovery: 1974

Discovered by: Kamoya Kimeu

Age: About 1.7 million years old

Species: Homo erectus

Vitamin overdose

This 1.7 million-year-old femur (thigh bone) of a Homo erectus female shows how scientists can sometimes determine an individual’s cause of death, even after fossilization. An abnormal outer layer of bone on her thigh shows evidence of bleeding just before death. After consulting doctors and accounts of wilderness explorers, researchers concluded that an overdose of vitamin A—perhaps from eating a carnivore’s liver, which concentrates vitamin A—caused the bleeding and her death.

KNM-WT-15000

Nickname: Turkana Boy

Site: Nariokotome, West Turkana, Kenya

Date of discovery: 1984

Discovered by: Kamoya Kimeu

Age: About 1.6 million years ago

Species: Homo erectus

The strapping youth

The ‘Turkana Boy’ skeleton has allowed scientists to find out a lot of information about body size, body shape, and growth rates of Homo erectus. Using bilateral symmetry to fill in missing bone (e.g., the missing left upper arm bone can be reconstructed as the mirror image of the right upper arm bone), his skeleton is over 90% complete.

The size and shape of the pelvis shows he was male, and his teeth tell he was eight or nine years old. He was 1.6 m (5 ft 3 in) tall and weighed 48 kg (106 lb) when he died; if he had reached adulthood, he might have grown to nearly 1.85 m (6 ft). Turkana Boy’s cranial capacity at death was 880 cubic centimeters, but scientists estimate it would have reached 909 cubic centimeters if he had grown into adulthood. There is evidence that he was growing up at a rate similar to modern humans, and he may have undergone an adolescent growth spurt characteristic of modern teenage boys. His cause of death at such a young age is unknown.

His long and slender body is evidence of an early human adaptation to the hot, dry climate of Africa. His long legs and narrow pelvis helped him walk farther, increasing his home range, and maybe even run long distances.

Trinil 2

Nickname: Java Man

Site: Trinil, Java, Indonesia

Date of discovery: 1891

Discovered by: Eugene Dubois

Age: Between 1 million and 700,000 years old

Species: Homo erectus

Indonesia's "Java Man"

While searching for fossils in Java, physician Eugène Dubois uncovered the tophalf of an early human skull in 1891. This skull, Trinil 2, is long, with a flat forehead and distinct browridges and a sagittal keel, though many of its features have been worn flat with age. Dubois named a new species, Pithecanthropus erectus after this specimen in 1894, but Ernst Mayr reassigned Trinil 2 to Homo erectus in the 1950s.

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Life History and Behavior

Behavior

How They Survived

The tall bodies and large brains of Homo erectus individuals required a lot of energy on a regular basis to function. Eating meat and other types of protein that could be quickly digested made it possible to absorb nutrients with a shorter digestive tract, making more energy available faster. There is also speculation that honey and underground tubers may have been significant food sources for Homo erectus.

Soon after we see evidence in the fossil record of the earliest Homo erectus fossils (by about 1.9 million years ago), we see evidence in the archeological record for the first major innovation in stone tool technology (by about 1.76 million years ago). Known as the Acheulean stone tool industry, it consisted of the creation of large cutting tools like hand axes and cleavers. Increased reliance on a broader set of tools may have helped Homo erectus survive during changing climates.

The earliest evidence of hearths (campfires) occur during the time range of Homo erectus. While we have evidence that hearths were used for cooking (and probably sharing) food, they are likely to have been places for social interaction, and also used for warmth and to keep away large predators.

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Evolution and Systematics

Evolution

Evolutionary Tree Information

Some scientists distinguish between the African (Homo ergaster) and Asian (Homo erectus sensu stricto) fossils of this taxon, while others lump them together as Homo erectus sensu lato. In either case, there is general agreement that it descended from an earlier species of Homo (e.g., Homo habilis) and represents one of the widest dispersals of early humans in our evolutionary history. It is likely that distinct populations of Homo erectus sensu lato led to the emergence of later hominin species, such as Homo heidelbergensis, and ultimately to our own species, Homo sapiens.

At the beginning of its time range, around 1.9 Mya, H. erectus coexisted in East Africa with several other early human species including Homo rudolfensis, Homo habilis, and Paranthropus boisei. Sometimes they were even found at the same fossil sites. At the end of its time range, around 143,000 years ago, it coexisted with Homo sapiens and possibly Homo floresiensis in Indonesia.

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Fossil History

History of Discovery

Year of Discovery: 1891

Eugène Dubois, a Dutch surgeon, found the first Homo erectus individual (Trinil 2) in Indonesia in 1891. In 1894, DuBois named the species Pithecanthropus erectus, or ‘erect ape-man.’ At that time, Pithecanthropus (later changed to Homo) erectus was the most primitive and smallest-brained of all known early human species; no early human fossils had even been discovered in Africa yet.

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Wikipedia

Homo erectus

"H. erectus" redirects here. For the seahorse species, see Hippocampus erectus. For the 2007 comedy film, see Homo Erectus (film). For 1997 album, see Homo erectus (album).
"Pithecanthropus erectus" redirects here. For the song and album by that title, see Pithecanthropus Erectus (album).

Homo erectus (meaning "upright man," from the Latin ērigere, "to put up, set upright") is an extinct species of hominin that lived throughout most of the Pleistocene, with the earliest first fossil evidence dating to around 1.9 million years ago and the most recent to around 143,000 years ago. The species originated in Africa and spread as far as Georgia, India, Sri Lanka, China and Java.[1][2]

There is still disagreement on the subject of the classification, ancestry, and progeny of H. erectus, with two major alternative classifications: erectus may be another name for Homo ergaster, and therefore the direct ancestor of later hominids such as Homo heidelbergensis, Homo neanderthalensis, and Homo sapiens; or it may be an Asian species distinct from African ergaster.[1][3][4]

Some palaeoanthropologists consider H. ergaster to be simply the African variety of H. erectus. This leads to the use of the term "Homo erectus sensu stricto" for the Asian H. erectus, and "Homo erectus sensu lato" for the larger species comprising both the early African populations (H. ergaster) and the Asian populations.[5][6]

A new debate appeared in 2013 in the paleontological community, with the publication of the Dmanisi skull 5 or D4500.[7] Considering the large morphological variation between all Dmanisi skulls, researchers suggests that many species of early human ancestor such as Homo ergaster or Homo heidelbergensis and even more Homo habilis were actually all Homo erectus.[8][9]

Origin[edit]

Homo erectus, Natural History Museum, Ann Arbor, Michigan

The first hypothesis is that H. erectus migrated from Africa during the Early Pleistocene, possibly as a result of the operation of the Saharan pump, around 2.0 million years ago, and it dispersed throughout much of the Old World. Fossilized remains 1.8 to 1 million years old have been found in Africa (e.g., Lake Turkana[10] and Olduvai Gorge), Georgia, Indonesia (e.g., Sangiran in Central Java and Trinil in East Java), Vietnam, China (e.g., Shaanxi) and India.[11]

The second hypothesis is that H. erectus evolved in Eurasia and then migrated to Africa. The species occupied a Caucasus site called Dmanisi, in Georgia, from 1.85 million to 1.77 million years ago, at the same time or slightly before the earliest evidence in Africa. Excavations found 73 stone tools for cutting and chopping and 34 bone fragments from unidentified creatures.[12][13]

Discovery and representative fossils[edit]

Skulls of
1. Gorilla 2. Australopithecus 3. Homo erectus 4. Neanderthal (La Chapelle aux Saints) 5. Steinheim Skull 6. Modern Homo sapiens

The Dutch anatomist Eugène Dubois, who was especially fascinated by Darwin's theory of evolution as applied to man, set out to Asia (the place accepted then, despite Darwin, as the cradle of human evolution), to find a human ancestor in 1886. In 1891, his team discovered a human fossil on the island of Java, Dutch East Indies (now Indonesia); he described the species as Pithecanthropus erectus (from the Greek πίθηκος,[14] "ape", and ἄνθρωπος,[15] "man"), based on a calotte (skullcap) and a femur like that of H. sapiens found from the bank of the Solo River at Trinil, in East Java. (This species is now regarded as H. erectus).

The find became known as Java Man. Thanks to Canadian anatomist Davidson Black's (1921) initial description of a lower molar, which was dubbed Sinanthropus pekinensis,[16] however, most of the early and spectacular discoveries of this taxon took place at Zhoukoudian in China. German anatomist Franz Weidenreich provided much of the detailed description of this material in several monographs published in the journal Palaeontologica Sinica (Series D).

Nearly all of the original specimens were lost during World War II; however, authentic Weidenreichian casts do exist at the American Museum of Natural History in New York and at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing, and are considered to be reliable evidence.

Throughout much of the 20th century, anthropologists debated the role of H. erectus in human evolution. Early in the century, however, due to discoveries on Java and at Zhoukoudian, it was believed that modern humans first evolved in Asia. A few naturalists (Charles Darwin most prominent among them) predicted that humans' earliest ancestors were African: he pointed out that chimpanzees and gorillas, who are human relatives, live only in Africa.[17]

From the 1950s to 1970s, however, numerous fossil finds from East Africa yielded evidence that the oldest hominins originated there. It is now believed that H. erectus is a descendant of earlier genera such as Ardipithecus and Australopithecus, or early Homo-species such as H. habilis or H. ergaster. H. habilis and H. erectus coexisted for several thousand years, and may represent separate lineages of a common ancestor.[18]

Archaeologist John T. Robinson and Robert Broom named Telanthropus capensis in the 1950s, now thought to belong to Homo erectus.[19] Robinson discovered a jaw fragment, SK 45, in September 1949 in Swartkrans, South Africa. In 1957, Simonetta proposed to re-designate it Homo erectus, and Robinson (1961) agreed.[20]

Dmanisi skull 3, Fossils skull D2700 and D2735 jaw, two of several found in Dmanisi in the Georgian Caucasus

The skull of Tchadanthropus uxoris, discovered in 1961 by Yves Coppens in Chad, is the earliest fossil human discovered in the North of Africa.[21] This fossil "had been so eroded by wind-blown sand that it mimicked the appearance of an australopith, a primitive type of hominid".[22] Though some first considered it to be a specimen of H. habilis,[23] it is no longer considered to be a valid taxon, and scholars rather consider it to represent H. erectus.[21][24]

Homo erectus georgicus[edit]

Homo erectus georgicus (Georgian: ქართველი ადამიანი) is the subspecies name sometimes used to describe fossil skulls and jaws found in Dmanisi, Georgia. Although first proposed as a separate species, it is now classified within H. erectus.[25][26][27] A partial skeleton was discovered in 2001 and 5 skulls between 1991 and 2005 (complete skull in 2005 the D4500) . The fossils are about 1.8 million years old. The remains were first discovered in 1991 by Georgian scientist, David Lordkipanidze, accompanied by an international team that unearthed the remains. There have been many proposed explanations of the dispersion of H. erectus georgicus.[28] Implements and animal bones were found alongside the ancient human remains.

At first, scientists thought they had found mandibles and skulls belonging to Homo ergaster, but size differences led them to name a new species, Homo georgicus, which was posited as a descendant of Homo habilis and ancestor of Asian Homo erectus. This classification was not upheld, and the fossil is now considered a divergent subgroup of Homo erectus, sometimes called Homo erectus georgicus.[29][30][31][32]

Location of Dmanisi discovery, Georgia
Dmanisi Skull 5 or D4500 draw.

At around 600 cubic centimetres (37 cu in) brain volume, the skull D2700 is dated to 1.77 million years old and in good condition, offering insights in comparison to the modern human cranial morphology. At the time of discovery the cranium was the smallest and most primitive Hominina skull from pleistocene period. Now is brother Skull 5 published much later, (2013) has this honor.

Subsequently, four fossil skeletons were found, showing a species primitive in its skull and upper body but with relatively advanced spines and lower limbs, providing greater mobility. They are now thought not to be a separate species, but to represent a stage soon after the transition between Homo habilis and H. erectus, and have been dated at 1.8 million years before the present, according to the leader of the project, David Lordkipanidze.[26][33] The assemblage includes one of the largest Pleistocene Homo mandibles (D2600), one of the smallest Lower Pleistocene mandibles (D211), a nearly complete sub‐adult (D2735), and a completely toothless specimen (D3900).[34]

A further skull name D4500 or simply Skull 5, the only intact skull ever found of an early Pleistocene hominin, was described in 2013.[8] At just under 546 cubic centimetres, the skull had the smallest braincase of all the individuals found at the site. The variations in these skulls prompted the researchers to examine variations in modern human and chimpanzees. The researchers found that while the Dmanisi skulls looked different from one another, the variations were no greater than those seen among modern people and among chimpanzees. These variations therefore suggest that previous fossil finds thought to be of different species on the basis of their variations, such as Homo rudolfensis, Homo gautengensis, H. ergaster and potentially H. habilis, may be alternatively interpreted as belonging to the same lineage as Homo erectus.[35]

Classification and special distinction[edit]

A reconstruction of Homo erectus (reconstruction shown in Westfälisches Landesmuseum, Herne, Germany, in a 2006 exhibition)

Many paleoanthropologists still debate the definition of H. erectus and H. ergaster as separate species. Several scholars suggested dropping the taxon Homo erectus and instead equating H. erectus with the archaic H. sapiens.[36][37][38][39] Some call H. ergaster the direct African ancestor of H. erectus, proposing that it emigrated out of Africa and immigrated to Asia, branching into a distinct species.[40] Most dispense with the species name ergaster, making no distinction between such fossils as the Turkana Boy and Peking Man.[citation needed] Although "Homo ergaster" has gained some acceptance as a valid taxon, these two are still usually defined as distinct African and Asian populations of the larger species H. erectus.

While some have argued (and insisted) that Ernst Mayr's biological species definition cannot be used here to test the above hypotheses, one can, however, examine the amount of morphological cranial variation within known H. erectus / H. ergaster specimens, and compare it to what one sees in disparate extant groups of primates with similar geographical distribution or close evolutionary relationship. Thus, if the amount of variation between H. erectus and H. ergaster is greater than what one sees within a species of, say, macaques, then H. erectus and H. ergaster may be considered two different species.

The extant model of comparison is very important, and selecting appropriate species can be difficult. (For example, the morphological variation among the global population of H. sapiens is small,[41] and our own special diversity may not be a trustworthy comparison). As an example, fossils found in Dmanisi in the Republic of Georgia were originally described as belonging to another closely related species, Homo georgicus, but subsequent examples showed their variation to be within the range of Homo erectus, and they are now classified as Homo erectus georgicus.

H. erectus had a cranial capacity greater than that of Homo habilis (although the Dmanisi specimens have distinctively small crania): the earliest remains show a cranial capacity of 850 cm³, while the latest Javan specimens measure up to 1100 cm³,[41] overlapping that of H. sapiens.; the frontal bone is less sloped and the dental arcade smaller than the australopithecines'; the face is more orthognatic (less protrusive) than either the australopithecines' or H. habilis's, with large brow-ridges and less prominent zygomata (cheekbones). These early hominins stood about 1.79 m (5 ft 10 in),[42] (Only 17 percent of modern male humans are taller)[43] and were extraordinarily slender, with long arms and legs.[44]

The sexual dimorphism between males and females was slightly greater than seen in H. sapiens, with males being about 25% larger than females, but less than that of the earlier Australopithecus genus. The discovery of the skeleton KNM-WT 15000, "Turkana boy" (Homo ergaster), made near Lake Turkana, Kenya by Richard Leakey and Kamoya Kimeu in 1984, is one of the most complete hominid-skeletons discovered, and has contributed greatly to the interpretation of human physiological evolution.

For the remainder of this article, the name Homo erectus will be used to describe a distinct species for the convenience of continuity.

Use of tools[edit]

Homo ergaster used more diverse and sophisticated stone tools than its predecessors. H. erectus, however, used comparatively primitive tools. This is possibly because H. ergaster first used tools of Oldowan technology and later progressed to the Acheulean[45] while the use of Acheulean tools began ca. 1.8 million years ago,[46] the line of H. erectus diverged some 200,000 years before the general innovation of Acheulean technology. Thus the Asian migratory descendants of H. ergaster made no use of any Acheulean technology. In addition, it has been suggested that H. erectus may have been the first hominid to use rafts to travel over oceans.[47]

Use of fire[edit]

East African sites, such as Chesowanja near Lake Baringo, Koobi Fora, and Olorgesailie in Kenya, show some possible evidence that fire was utilized by early humans. At Chesowanja, archaeologists found red clay sherds dated to be 1.42 Mya.[48] Reheating on these sherds show that the clay must have been heated to 400 °C (752 °F) to harden. At Koobi Fora, sites FxJjzoE and FxJj50 show evidence of control of fire by Homo erectus at 1.5 Mya, with the reddening of sediment that can only come from heating at 200–400 °C (392–752 °F).[48] A "hearth-like depression" exists at a site in Olorgesailie, Kenya. Some microscopic charcoal was found, but it could have resulted from a natural brush fire.[48] In Gadeb, Ethiopia, fragments of welded tuff that appeared to have been burned were found in Locality 8E, but re-firing of the rocks may have occurred due to local volcanic activity.[48] These have been found amongst H. erectus–created Acheulean artifacts. In the Middle Awash River Valley, cone-shaped depressions of reddish clay were found that could have been created by temperatures of 200 °C (392 °F). These features are thought to be burned tree stumps such that they would have fire away from their habitation site.[48] Burnt stones are also found in the Awash Valley, but volcanic welded tuff is also found in the area.

A site at Bnot Ya'akov Bridge, Israel, has been claimed to show that H. erectus or H. ergaster made fires between 790,000 and 690,000 BP.[49] To date this has been the most widely accepted claim, although recent reanalysis of burnt bone fragments and plant ashes from the Wonderwerk Cave have sparked claims of evidence supporting human control of fire by 1 Ma.[50]

Cooking[edit]

There is no archaeological evidence that Homo erectus cooked their food. The idea has been suggested,[51] but is not generally accepted.[52][53] It is known, from the study of microwear on handaxes, that meat formed a major part of the erectus diet. Meat is digestible without cooking, and is sometimes eaten raw by modern humans. Nuts, berries, fruits are also edible without cooking. Thus cooking cannot be presumed: the issue rests on clear evidence from archaeological sites, which at present does not exist.

Sociality[edit]

Homo erectus was probably the first hominid to live in a hunter-gatherer society, and anthropologists such as Richard Leakey believe that it was socially more like modern humans than the more Australopithecus-like species before it. Likewise, increased cranial capacity generally coincides with the more sophisticated tools occasionally found with fossils.

The discovery of Turkana boy (H. ergaster) in 1984 gave evidence that, despite its Homo-sapiens-like anatomy, it may not have been capable of producing sounds comparable to modern human speech. Ergaster likely communicated in a proto-language lacking the fully developed structure of modern human language but more developed than the non-verbal communication used by chimpanzees.[54] Such inference has been challenged by the discovery of H. ergaster/erectus vertebrae some 150,000 years older than the Turkana Boy in Dmanisi, Georgia, that reflect vocal capabilities within the range of H. sapiens.[55] Both brain-size and the presence of the Broca's area also support the use of articulate language.[56]

H. erectus was probably the first hominid to live in small, familiar band-societies similar to modern hunter-gatherer band-societies.[57] H. erectus/ergaster is thought to be the first hominid to hunt in coordinated groups, use complex tools, and care for infirm or weak companions.

There has been some debate as to whether H. erectus, and possibly the later Neanderthals,[58] may have interbred with anatomically modern humans in Europe and Asia. See Neanderthal admixture theory.[59]

Descendants and subspecies[edit]

Homo erectus remains one of the most long-lived species of Homo, having existed over a million years, while Homo sapiens so far has existed for 200,000 years. If considering Homo erectus in its strict sense as only referring to the Asian variety, no consensus has been reached as to whether it is ancestral to H. sapiens or any later hominids.

A model of the face of an adult female Homo erectus. Reconstruction by John Gurche, Smithsonian Museum of Natural History, based on KNM ER 3733 and 992.

Related species

Previously referred taxa

The discovery of Homo floresiensis in 2003 and of the recentness of its extinction has raised the possibility that numerous descendant species of Homo erectus may have existed in the islands of Southeast Asia and await fossil discovery (see Orang Pendek). Homo erectus soloensis, who was long assumed to have lived on Java at least as late as about 50,000 years ago but was re-dated in 2011 to a much higher age,[60] would be one of them. Some scientists are skeptical of the claim that Homo floresiensis is a descendant of Homo erectus. One explanation holds that the fossils are of a modern human with microcephaly, while another one holds that they are from a group of pygmies.

Individual fossils[edit]

Original fossils of Pithecanthropus erectus (now Homo erectus) found in Java in 1891.

Some of the major Homo erectus fossils:

Gallery[edit]

Replica of lower jaws of Homo erectus from Tautavel, France
Calvaria "Sangiran II" Original, Collection Koenigswald, Senckenberg Museum
A reconstruction based on evidence from the Daka Member, Ethiopia. 

See also[edit]

General:

References[edit]

  1. ^ a b Hazarika, Manji (16–30 June 2007). "Homo erectus/ergaster and Out of Africa: Recent Developments in Paleoanthropology and Prehistoric Archaeology". 
  2. ^ Chauhan, Parth R. (2003) "Distribution of Acheulian sites in the Siwalik region" in An Overview of the Siwalik Acheulian & Reconsidering Its Chronological Relationship with the Soanian – A Theoretical Perspective. assemblage.group.shef.ac.uk
  3. ^ See overview of theories on human evolution.
  4. ^ Klein, R. (1999). The Human Career: Human Biological and Cultural Origins. Chicago: University of Chicago Press, ISBN 0226439631.
  5. ^ Antón, S. C. (2003). "Natural history of Homo erectus". Am. J. Phys. Anthropol. 122: 126–170. doi:10.1002/ajpa.10399. "By the 1980s, the growing numbers of H. erectus specimens, particularly in Africa, led to the realization that Asian H. erectus (H. erectus sensu stricto), once thought so primitive, was in fact more derived than its African counterparts. These morphological differences were interpreted by some as evidence that more than one species might be included in H. erectus sensu lato (e.g., Stringer, 1984; Andrews, 1984; Tattersall, 1986; Wood, 1984, 1991a, b; Schwartz and Tattersall, 2000) ... Unlike the European lineage, in my opinion, the taxonomic issues surrounding Asian vs. African H. erectus are more intractable. The issue was most pointedly addressed with the naming of H. ergaster on the basis of the type mandible KNM-ER 992, but also including the partial skeleton and isolated teeth of KNM-ER 803 among other Koobi Fora remains (Groves and Mazak, 1975). Recently, this specific name was applied to most early African and Georgian H. erectus in recognition of the less-derived nature of these remains vis à vis conditions in Asian H. erectus (see Wood, 1991a, p. 268; Gabunia et al., 2000a). It should be noted, however, that at least portions of the paratype of H. ergaster (e.g., KNM-ER 1805) are not included in most current conceptions of that taxon. The H. ergaster question remains famously unresolved (e.g., Stringer, 1984; Tattersall, 1986; Wood, 1991a, 1994; Rightmire, 1998b; Gabunia et al., 2000a; Schwartz and Tattersall, 2000), in no small part because the original diagnosis provided no comparison with the Asian fossil record" 
  6. ^ Suwa G; Asfaw B; Haile-Selassie Y; White T; Katoh S; WoldeGabriel G; Hart W; Nakaya H; Beyene Y (2007). "Early Pleistocene Homo erectus fossils from Konso, southern Ethiopia". Anthropological Science 115 (2): 133. doi:10.1537/ase.061203.  edit
  7. ^ Skull suggests three early human species were one : Nature News & Comment
  8. ^ a b David Lordkipanidze, Marcia S. Ponce de Leòn, Ann Margvelashvili, Yoel Rak, G. Philip Rightmire, Abesalom Vekua, Christoph P. E. Zollikofer (18 October 2013). "A Complete Skull from Dmanisi, Georgia, and the Evolutionary Biology of Early Homo". Science 342 (6156): 326–331. doi:10.1126/science.1238484. 
  9. ^ Switek, Brian (17 October 2013). "Beautiful Skull Spurs Debate on Human History". National Geographic. Retrieved 22 September 2014. 
  10. ^ Frazier, Kendrick (Nov–Dec 2006). "Leakey Fights Church Campaign to Downgrade Kenya Museum’s Human Fossils". Skeptical Inquirer magazine 30 (6). Archived from the original on 2009-01-10. 
  11. ^ Prins, Harald E. L.; Walrath, Dana and McBride, Bunny (2007). Evolution and prehistory: the human challenge. Wadsworth Publishing. p. 162. ISBN 978-0-495-38190-7. 
  12. ^ Ferring, R.; Oms, O.; Agusti, J.; Berna, F.; Nioradze, M.; Shelia, T.; Tappen, M.; Vekua, A.; Zhvania, D.; Lordkipanidze, D. (2011). "Earliest human occupations at Dmanisi (Georgian Caucasus) dated to 1.85-1.78 Ma". Proceedings of the National Academy of Sciences 108 (26): 10432. doi:10.1073/pnas.1106638108.  edit
  13. ^ New discovery suggests Homo erectus originated from Asia. Dnaindia.com. June 8, 2011.
  14. ^ pithecos
  15. ^ anthropos
  16. ^ from sino-, a combining form of the Greek Σίνα, "China", and the Latinate pekinensis, "of Peking"
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Notes

The Unknown

We don’t know everything about our early ancestors—but we keep learning more! Paleoanthropologists are constantly in the field, excavating new areas, using groundbreaking technology, and continually filling in some of the gaps about our understanding of human evolution.

Below are some of the still unanswered questions about Homo erectus that may be answered with future discoveries:

1. Was Homo erectus the direct ancestor of Homo sapiens, our own species?

2. Data suggest that increasing body size, greater reliance on animal food resources, and increased range size were part of a web of factors that facilitated the initial early dispersal of H. erectus from Africa. Was one of these factors more important than the others?

3. Are the fossils from earlier time periods in East Africa, and from Georgia, all part of a single species (Homo erectus), regionally variable in size and shape? Or are there actually several species of early human represented by what we are now calling Homo erectus?

4. How well did Homo erectus master the control of fire and how widespread was fire used? What does this say about possible dietary shifts in this species?

5. Did Homo erectus grow up in a more human-like pattern and rate, or a more ape-like one? Was Homo erectus the first early human species to experience an adolescent growth spurt?

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