Late Archaic Humans Research Articles

Possible vertebral brucellosis infection in a Neanderthal

The La Chapelle-aux-Saints 1 skeleton of an old (>60-year-old) male Neanderthal is renowned for the advanced osteoarthritis of its spinal column and hip joint, and their implications for posture and lifestyle in these Mid- to Late Pleistocene humans. Reassessment of the pathologic lesions reveals erosions at multiple non-contiguous vertebrae and reactive bone formation extending far beyond the left hip joint, which suggests the additional diagnosis of brucellosis. This implies the earliest secure evidence of this zoonotic disease in hominin evolution. Brucellosis might have been transmitted via butchering or eating raw meat and is well compatible with the range of prey animals documented for Neanderthals. The associated infertility could have represented an important aspect of health in these late archaic humans.

The upper limb skeleton and behavioral lateralization of modern humans from Zhaoguo Cave, southwestern China.

Aims of the study are to initially describe and comparatively evaluate the morphology of the new Zhaoguo M1 upper limb remains, and contextualize upper limb functional adaptations among those of other worldwide Upper Paleolithic (UP) humans to make inferences about subsistence-related activity patterns in southwestern China at the Pleistocene-Holocene boundary. The preserved Zhaoguo M1 skeletal remains include paired humeri, ulnae, and radii, among others. These specimens were scanned using micro-computed tomography to evaluate internal structural properties, while external osteometric dimensions of the Zhaoguo M1 upper limb elements also were acquired. Both sets of measurements were compared to published data on Neandertals, and Middle and Upper Paleolithic modern humans. The upper limb elements of Zhaoguo M1 display a suite of characteristics that generally resemble those of other contemporary Late UP (LUP) modern humans, while robusticity indices generally fall within the upper range of LUP variation. The Zhaoguo M1 upper limb elements display fewer traits resembling those of late archaic humans. The Zhaoguo M1 individual exhibits diaphyseal asymmetry in several upper limb elements suggesting left hand dominance. When evaluating the full range of magnitudes of humeral bilateral asymmetry in the comparative sample, Zhaoguo M1 falls at the lower end overall, but yet is relatively higher than contemporary LUP modern humans specifically from East Eurasia. The Zhaoguo M1 individual suggests typical LUP modern human upper limb morphology persisted in southwest China until the end of the last glacial period. Upper limb bone asymmetry of Zhaoguo M1 also indicates that behavioral activities attributed to a hunter-gatherer tradition apparently extended through the Pleistocene-Holocene transition in this region.

Morphology, pathology, and the vertebral posture of the La Chapelle-aux-Saints Neandertal

Although the early postural reconstructions of the Neandertals as incompletely erect were rejected half a century ago, recent studies of Neandertal vertebral remains have inferred a hypolordotic, flat lower back and spinal imbalance for them, including the La Chapelle-aux-Saints 1 skeleton. These studies form part of a persistent trend to view the Neandertals as less "human" than ourselves despite growing evidence for little if any differences in basic functional anatomy and behavioral capabilities. We have therefore reassessed the spinal posture of La Chapelle-aux-Saints 1 using a new pelvic reconstruction to infer lumbar lordosis, interarticulation of lower lumbar (L4-S1) and cervical (C4-T2) vertebrae, and consideration of his widespread age-related osteoarthritis. La Chapelle-aux-Saints 1 exhibits a pelvic incidence (and hence lumbar lordosis) similar to modern humans, articulation of lumbar and cervical vertebrae indicating pronounced lordosis, and Baastrup disease as a product of his advanced age, osteoarthritis, and lordosis. Our findings challenge the view of generally small spinal curvatures in Neandertals. Setting aside the developmentally abnormal Kebara 2 vertebral column, La Chapelle-aux-Saints 1 is joined by other Neandertals with sufficient vertebral remains in providing them with a fully upright (and human) axial posture.

Lithic production strategies during the late Middle Pleistocene at Dali, Shaanxi Province, China: implications for understanding late archaic humans

The Dali hominid site is well known as it contains a human cranium associated with stone artefacts and animal bones. Dating efforts have provided an age range of ~ 300–247 ka for these remains. Renewed study of the cranium in recent years has revealed a mix of archaic traits in the neurocranium and derived features in the face, and thus, this specimen may provide insight into our understanding of modern human evolution in China. However, the technological behaviour possessed by these people has remained unclear due to a lack of new and detailed research. In this paper, we re-examine the lithic assemblages from Dali, originally excavated in 1978 and 1980, and for the first time, we now provide a sound assemblage by removing those geofacts that have been used in past archaeological reports. Although the total number of artefacts is now smaller, our results show that core reduction strategies at Dali are primarily expedient, dominated by simple unifacial unidirectional flaking. In contrast, the formal tools exhibit relatively advanced technology, with artefacts that are diverse in type and characterized by a relatively standardized production strategy. In contrast to the widely accepted model for slow and conservative technological development in Chinese Palaeolithic technology, pre 40 ka, here, we suggest that there is evidence for gradual technological changes from the Early to Middle and early Late Pleistocene.

Patterns of humeral asymmetry among Late Pleistocene humans

Human humeral diaphyseal asymmetry in midshaft and mid-distal rigidity is assessed through the Late Pleistocene in samples of late archaic (Neandertal) and early modern humans. It is considered with respect to directionality (handedness), levels of asymmetry, body size and sexual differences. The overall Late Pleistocene sample indicates a right-handed preference in frequencies (right: 74.8%, left: 15.0%, ambiguous: 10.3%), which are similar to those of recent human samples. Average levels of humeral asymmetry are elevated relative to Holocene samples through all but the small Middle Paleolithic modern human and eastern Eurasian late Upper Paleolithic samples. Humeral asymmetry is especially high among the males relative to the females, and the possibility of a division of labor between uni-manual tasks (mostly male) and bi-manual tasks (mostly female) is considered. At the same time, there is a general pattern of increased asymmetry with larger body size, but it remains unclear to what extent it reflects body size versus sexual effects on bilateral humeral loading. There do not appear to have been substantial changes in humeral asymmetry through time, indicating a continuity of similar manual behavioral patterns through the Late Pleistocene, despite considerable changes in technology through the Late Pleistocene.

Significance of Neandertal and Denisovan Genomes in Human Evolution

DNA evidence is changing the field of paleoanthropology. Genomes have been recovered from Neandertals and from a previously unknown archaic human population represented at Denisova Cave in the Altai Mountains. Both populations contributed to the ancestry of living human populations; Neandertals account for between 1% and 4% of the ancestry of people outside sub-Saharan Africa, and Denisovans contribute from 1% to 6% of the ancestry of people in island Southeast Asia and Oceania. These genomes lend new detail about the dynamics of Neandertal populations and help us to understand the diversity of the Middle Pleistocene ancestors of late archaic and modern humans worldwide. Further analyses have begun to uncover details about the phenotypes of archaic peoples and their contribution to the biology of recent humans. These insights have included new information about pigmentation, immunity, and the brain.

Late Pleistocene adult mortality patterns and modern human establishment

The establishment of modern humans in the Late Pleistocene, subsequent to their emergence in eastern Africa, is likely to have involved substantial population increases, during their initial dispersal across southern Asia and their subsequent expansions throughout Africa and into more northern Eurasia. An assessment of younger (20-40 y) versus older (>40 y) adult mortality distributions for late archaic humans (principally Neandertals) and two samples of early modern humans (Middle Paleolithic and earlier Upper Paleolithic) provides little difference across the samples. All three Late Pleistocene samples have a dearth of older individuals compared with Holocene ethnographic/historical samples. They also lack older adults compared with Holocene paleodemographic profiles that have been critiqued for having too few older individuals for subsistence, social, and demographic viability. Although biased, probably through a combination of preservation, age assessment, and especially Pleistocene mobility requirements, these adult mortality distributions suggest low life expectancy and demographic instability across these Late Pleistocene human groups. They indicate only subtle and paleontologically invisible changes in human paleodemographics with the establishment of modern humans; they provide no support for a life history advantage among early modern humans.

Human remains from Zhirendong, South China, and modern human emergence in East Asia

The 2007 discovery of fragmentary human remains (two molars and an anterior mandible) at Zhirendong (Zhiren Cave) in South China provides insight in the processes involved in the establishment of modern humans in eastern Eurasia. The human remains are securely dated by U-series on overlying flowstones and a rich associated faunal sample to the initial Late Pleistocene, >100 kya. As such, they are the oldest modern human fossils in East Asia and predate by >60,000 y the oldest previously known modern human remains in the region. The Zhiren 3 mandible in particular presents derived modern human anterior symphyseal morphology, with a projecting tuber symphyseos, distinct mental fossae, modest lateral tubercles, and a vertical symphysis; it is separate from any known late archaic human mandible. However, it also exhibits a lingual symphyseal morphology and corpus robustness that place it close to later Pleistocene archaic humans. The age and morphology of the Zhiren Cave human remains support a modern human emergence scenario for East Asia involving dispersal with assimilation or populational continuity with gene flow. It also places the Late Pleistocene Asian emergence of modern humans in a pre-Upper Paleolithic context and raises issues concerning the long-term Late Pleistocene coexistence of late archaic and early modern humans across Eurasia.

New Light on the Earliest Hominid Occupation in East Asia

New Light on the Earliest Hominid Occupation in East Asia

Early Modern Humans

Perceptions of the emergence and spread of modern humans have changed recently through the reanalysis of fossils, an improved geochronological framework, and the discovery of a few specimens. Early modern humans in various portions of the Old World exhibit complex and varying mosaics of archaic, modern, and regional morphological characteristics. On the basis of this pattern, in conjunction with the emerging chronology of the earliest modern humans, the paleontological data indicate an assimilation model for modern human origins, in which the earliest modern humans emerged in eastern Africa, dispersed briefly into southwestern Asia, and then subsequently spread into the remainder of Africa and southern Asia, eventually into higher latitude Eurasia. The earliest modern humans outside of the core area of eastern Africa can be understood only if a variable degree of admixture with regional groups of late archaic humans occurred. Current and expected fossil and molecular data are unlikely to illuminate the degree of assimilation that took place in most regions of the Old World. However, the current chronological and phylogenetic framework provides the basis for ongoing investigation of the nature of this Late Pleistocene transitional period.

An early modern human from the Peştera cu Oase, Romania.

The 2002 discovery of a robust modern human mandible in the Peştera cu Oase, southwestern Romania, provides evidence of early modern humans in the lower Danubian Corridor. Directly accelerator mass spectrometry radiocarbon (14C)-dated to 34,000-36,000 14C years B.P., the Oase 1 mandible is the oldest definite early modern human specimen in Europe and provides perspectives on the emergence and evolution of early modern humans in the northwestern Old World. The moderately long Oase 1 mandible exhibits a prominent tuber symphyseos and overall proportions that place it close to earlier Upper Paleolithic European specimens. Its symmetrical mandibular incisure, medially placed condyle, small superior medial pterygoid tubercle, mesial mental foramen, and narrow corpus place it closer to early modern humans among Late Pleistocene humans. However, its cross-sectional symphyseal orientation is intermediate between late archaic and early modern humans, the ramus is exceptionally wide, and the molars become progressively larger distally with exceptionally large third molars. The molar crowns lack derived Neandertal features but are otherwise morphologically undiagnostic. However, it has unilateral mandibular foramen lingular bridging, an apparently derived Neandertal feature. It therefore presents a mosaic of archaic, early modern human and possibly Neandertal morphological features, emphasizing both the complex population dynamics of modern human dispersal into Europe and the subsequent morphological evolution of European early modern humans.

O Menino do Lapedo

AbstractThe emergence of modern humans during the Late Pleistocene and the phylogenetic fate of the northwestern Eurasian Neandertals have been closely linked to our perceptions of the behavior and abilities of those late archaic humans, the Neandertals. In the past several years, several lines of evidence, including radiometric dating of archeological assemblages, taphonomic analyses of faunal remains, stable isotope analysis of Neandertal remains, the dating of late Neandertal remains, considerations of initial Upper Paleolithic associations and chronologies, and reassessments of Neandertal to early modern human phylogenetic relationships have tended to minimise the perceived behavioral differences between the Neandertals and early modern humans across Europe. Into this context, the discovery of an earlier Upper Paleolithic (Gravettian) early modern human child's skeleton at the Abrigo do Lagar Velho, Lapedo Valley, Portugal with distinctive Neandertal features provides further support for the de-dehumanising of the Neandertals. Its anatomical evidence for population blending when early modern humans spread into southern Iberia after 30,000 B.P. indicates that the behavioral differences between the local Neandertals and in-dispersing early modern humans were subtle and did not preclude them from regarding each other as human.

Dental Caries in the Aubesier 5 Neandertal Primary Molar

The exfoliated maxillary primary first molar (dm1) from the Middle Palaeolithic of the Bau de l'Aubesier (Vaucluse, France), Aubesier 5, exhibits a mid-lingual pit which is identified as a modest carious lesion. The lesion is identified as such by the erosion of the surface through the dentoenamel junction into the dentine, with rounded margins exhibiting ante-mortem wear striae. It is the third documented case of such lesions among the Neandertals, indicating that these lesions were present, if still rare, among these late archaic humans.

Diaphyseal Cross-sectional Geometry of Near Eastern Middle Palaeolithic Humans: The Tibia

External osteometric assessments of Near Eastern Middle Palaeolithic human tibial diaphyseal robusticity have been used to argue for significant differences in locomotor loading regimes between late archaic and early modern humans from the Middle Palaeolithic of that region. Reassessment of tibial diaphyseal strength using cross-sectional geometry of their shafts scaled against biomechanically appropriate measures of body mass and beam length reveals no significant difference between the Near Eastern late archaic human and Qafzeh-Skhul early modern human samples. This is in agreement with other assessments of their comparative levels of locomotor strength and endurance indicating similar levels of summed loads upon their lower limbs once body mass and beam length are appropriately incorporated into the analysis. At the same time, there are no systematic differences in either relative cortical area within cross-sections or the biomechanically relevant distribution of bone (indicated by perpendicular second moments of area) between these samples. What emerges from a consideration of appropriately scaled measures of strength of these NEMP tibiae (however precise the estimates employed) is that, contrary to previous assessments, there are no grounds for inferring a significant change in locomotor activity levels or patterns between late archaic and early modern humans in the Near Eastern Middle Palaeolithic.

Diaphyseal Cross-sectional Geometry of Near Eastern Middle Palaeolithic Humans: The Humerus

The Near Eastern Middle Palaeolithic is associated with two hominid lineages, one of late archaic humans from Amud, Dederiyeh, Kebara, Shanidar and Tabun and the other of early modern humans from Qafzeh and Skhul. Biomechanical analysis of their humeral diaphyses, which are plastic in response to different loading regimes from activity patterns, reveals similar cross-sectional shapes, both in terms of cortical area relative to total area and in maximum to minimum bending rigidity. In this context, the late archaic humans have significantly more robust humeral diaphyses when cortical areas and especially polar moments of area are scaled to humeral lengths. These results join data from anterior dental attrition and upper limb morphology to indicate significantly greater use of the anatomy to accomplish manipulative tasks among these late archaic humans. However, given the associations of both groups with similar Middle Palaeolithic assemblages, it is the gracility of the Qafzeh-Skhul humans which is anomalous and requires explanation.

Discrete trait and dental morphometric affinities of the Tabun 2 mandible

Evolutionary scenarios of Near Eastern Middle Paleolithic hominids depend to an extent upon whether the terminal Middle Pleistocene Tabun 2 mandible has its primary affinities with the late archaic (Neandertalsensu lato) or early modern (Qafzeh–Skhul) human lineage in the region. Since the specimen has been assigned to each group or seen as bridging them, we have re-examined its morphological affinities relative to these two samples, as well as to European samples of later Pleistocene hominids. This has been done with respect to posterior corporeal and ramal discrete traits, symphyseal morphology, and proportional morphometric patterns along the dental arcade. Taking within and between sample ranges of variation into account, the lateral corporeal and ramal discrete characters are either ambiguous or suggest Neandertal affinities. Anterior symphyseal morphology is largely unknown, but amentum osseumis indicated by a moderateincisura mandibulare anterior, and thetuber symphyseosdid not extend superiorly toward the alveoli, a non-modern arrangement. The lingual symphysis presents the largestplanum alveolareknown for a Near Eastern Middle Paleolithic hominid. Morphometric analysis of proportions along the dental arcade separate Tabun 2 from Near Eastern and European early modern humans and place it among the late archaic humans. It is dentally closest to the Near Eastern late archaic human lineage and the Krapina sample. These analyses therefore indicate that it is best seen as part of the Near Eastern late archaic human lineage with only thementum osseumand incisure shape indicating any approach to the Qafzeh–Skhul humans within the Near Eastern Middle Paleolithic.

The M. obturator internus sulcus on Middle and Late Pleistocene human ischia

Recent human ischia and those of Middle and Late Pleistocene hominids exhibit variation in the cranio-caudal location of the sulcus for the internal obturator muscle as it rounds the ischium through the lesser sciatic notch, from being fully cranial of the ischial tuberosity, to bordering the tuberosity, to crossing the superior tuberosity. Among two recent human samples, all three forms exist, with the cranial position of the sulcus being more common in a 20th century Euroamerican sample whereas the intermediate one predominates in a horticultural late prehistoric Amerindian sample. The available Pleistocene Homo fossil remains exhibit the full range of variation with no one form being dominant in Middle Pleistocene archaic humans and Middle Paleolithic late archaic and early modern humans. It is only within the Upper Paleolithic that the cranial and intermediate locations for the sulcus become predominant. These patterns therefore indicate that it is inappropriate to use this feature for distinguishing later Pleistocene hominid groups. © 1996 Wiley-Liss, Inc.

Morphological affinities of the proximal ulna from Klasies River main site: archaic or modern?

The Middle Stone Age (MSA) asociated hominids from Klasies River Mouth (KRM) have taken on a key role in debate about the origins of modern humans, with their craniofacial remains seen as either representing the earliest well-dated modern humans in southern Africa or orthognathic late archaic humans. Diagnostic postcranial remains from Klasies are few, but one specimen—a proximal right ulna from the lower SAS member—is useful for assessing the morphological affinities of these hominids. Canonical variates analysis using 14 proximal ulnar dimensions and comparative data from European, west Asian and African archaic humans, and Levantine Mousterian, European Upper Paleolithic, African Epipaleolithic and diverse recent modern human samples (many of recent African descent) were employed to assess the morphological affinities of this specimen. Results suggest an archaic total morphological pattern for the Klasies ulna. Analysis of diaphyseal cross-sectional geometry reveals an ulnar shaft with relatively thick cortical bone, but the specimen cannot be readily distinguished from Neandertals or early anatomically modern humans on the basis of shaft cross-sectional properties. If the isolated ulna from Klasies is indicative of the general postcranial morphology of these hominids, then the MSA-associated humans from KRM may not be as modern as has been claimed from the craniofacial material. It is possible also that the skeletal material from KRM reflects mosaic evolution—retention of archaic postcranial characteristics, perhaps indicating retention of archaic habitual behavior patterns, in hominids that were becoming craniofacially modern.

Particulate versus integrated evolution of the upper body in late pleistocene humans: A test of two models

Evolutionary biologists are largely polarized in their approaches to integrating microevolutionary and macroevolutionary processes. Neo-Darwinians typically seek to identify population-level selective and genetic processes that culminate in macroevolutionary events. Epigeneticists and structuralists, on the other hand, emphasize developmental constraints on the action of natural selection, and highlight the role of epigenetic shifts in producing evolutionary change in morphology. Accordingly, the ways in which these paradigms view and address morphological contrasts between classes of related organisms differ. These paradigms, although seldomly explicitly stated, emerge in paleoanthropology as well. Considerations of postcranial morphological contrasts between archaic and modern humans typically fall into one of two broad interpretive models. The first derives from the neo-Darwinian perspective and holds that evolution in the postcranial skeleton was largely mosaic (operating in a particulate manner), and that temporal change in specific traits informs us about behavioral shifts or genetic evolution affecting isolated anatomical regions (i.e., adaptive behavioral inferences can be made from comparative studies of individual trait complexes). The alternative model follows from the epigeneticist paradigm and sees change in specific postcranial traits as correlated responses to change in overall body form (involving shifts in regulation of skeletal growth, or selective and developmental responses to broad adaptive shifts). By this view, integration of functional systems both constrains and directs evolution of various traits, and morphological contrasts inform us about overall change in body form related to change in such things as overall growth patterns, climatic adaptation, and technological dependency. These models were tested by confirmatory factor analysis using measures of upper body form and upper limb morphological traits in Eurasian Neandertal and early modern fossils and recent human samples. Results indicate (1) a model of morphological integration fits the data better than a model of no integration, but (2) this integration accounts for less than half of the variance in upper limb traits, suggesting a high degree of tolerance for particulate evolution in the context of an integrated upper body plan. Significant relationships were detected between joint shapes and body size, between humeral shaft shape and body size and chest shape, and between measures of biomechanical efficiency and robusticity. The observed morphological differences between late archaic and early modern humans reflect particulate evolution in the context of constraints imposed by genetic and morphological integration. While particulate approaches to interpreting the fossil record appear to be justified, attention must also be paid to delineating the nature and extent of morphological integration and its role in both constraining and producing observed patterns of variation between groups. Confirmatory factor analysis provides a means of examining trait covariance matrices, and serves as a useful method of identifying patterns of integration in morphology. © 1996 Wiley-Liss, Inc.

Determinants of retromolar space presence in Pleistocene Homo mandibles

Abstract The high frequency of mandibular retromolar spaces among the Neandertals is often cited as a derived character relative to Early and Middle Pleistocene members of the genus Homo . Four explanations have been put forward relating variation in Neandertal dentofacial variables to the high frequency of retromolar spaces: (1) an anterior migration of the dental arcade (Coon, 1962; Howells, 1975; Wolpoff, 1980); (2) a posterior retreat of the zygomatic and anterior ramal regions relative to a fixed molar position (Trinkaus, 1987); (3) a shortening of the dental arcade due to mesiodistal molar diminution (Rak, 1986); and (4) a shortening of the dental arcade due to a combination of anterior migration of the postcanine dentition and posterior migration of the anterior dentition (Spencer & Demes, 1993). Analysis of the temporal and geographical distributions of retromolar space frequencies for available fossil mandibles ( n =77) reinforces the interpretation of a high frequency of retromolar spaces being derived in later Pleistocene Neandertal clade specimens relative to Early and Middle Pleistocene Homo . Yet, the contrast between these late archaic humans and early modern humans (especially from the Near East) is less pronounced, removing this feature from the list of possible Neandertal autapomorphies. Logistic regression analysis of a sample subset ( n =22) for which mandibular length, dental arcade length and ramus breadth could be measured demonstrates that retromolar spaces are best seen as a combined result of reduced dental arcade lengths (i.e. mesiodistally reduced postcanine dimensions) and reduced ramus breadths, in the context of little or no reduction in overall mandibular length. While the proximate spatial mechanisms accounting for higher frequencies of retromolar spaces and related facial features among the Neandertals are straightforward, ultimate causal mechanisms are more elusive. Posterior dental reduction and the associated reduction in zygomatic and ramal dimensions can be explained, at least in part, as an aspect of masticatory gracilization, probably a result of technological shifts in food processing. The maintenance of total facial prognathism, and hence mandibular length, has proven more difficult to understand.