Tim D. White

University of California, Berkeley, Berkeley, California, United States

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Publications (118)1847.25 Total impact

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    ABSTRACT: 10.1073/pnas.1403659111
    Proceedings of the National Academy of Sciences 04/2015; 112(16-16):4877-4884. DOI:10.1073/pnas.1403659111 · 9.81 Impact Factor
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    ABSTRACT: Although the suid genus Kolpochoerus is well known from the Plio-Pleistocene of Africa, the evolutionary history of one of its constituent species, K. majus, remained obscure until substantial fossil evidence accumulated during the last 20 years, largely from sites in Ethiopia. Here, we describe Kolpochoerus phillipi sp. nov., based on a fairly complete skull and the remains of additional individuals from ~2.5 Ma deposits at Matabaietu, in the Middle Awash study area of Ethiopia. Based on a phylogenetic analysis, we suggest that K. phillipi sp. nov. belongs to a clade of “bunolophodont suines” including K. majus and the extant giant forest hog Hylochoerus meinertzhageni. Within this clade, K. phillipi sp. nov. likely represents a potential ancestor of K. majus, based on its morphology and stratigraphic position.
    Acta Palaeontologica Polonica 03/2015; Acta Palaeontologica Polonica(60):79-96. DOI:10.4202/app.2012.0083 · 1.72 Impact Factor
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    ABSTRACT: The early Pliocene African hominoid Ardipithecus ramidus was diagnosed as a having a unique phylogenetic relationship with the Australopithecus + Homo clade based on nonhoning canine teeth, a foreshortened cranial base, and postcranial characters related to facultative bipedality. However, pedal and pelvic traits indicating substantial arboreality have raised arguments that this taxon may instead be an example of parallel evolution of human-like traits among apes around the time of the chimpanzee-human split. Here we investigated the basicranial morphology of Ar. ramidus for additional clues to its phylogenetic position with reference to African apes, humans, and Australopithecus. Besides a relatively anterior foramen magnum, humans differ from apes in the lateral shift of the carotid foramina, mediolateral abbreviation of the lateral tympanic, and a shortened, trapezoidal basioccipital element. These traits reflect a relative broadening of the central basicranium, a derived condition associated with changes in tympanic shape and the extent of its contact with the petrous. Ar. ramidus shares with Australopithecus each of these human-like modifications. We used the preserved morphology of ARA-VP 1/500 to estimate the missing basicranial length, drawing on consistent proportional relationships in apes and humans. Ar. ramidus is confirmed to have a relatively short basicranium, as in Australopithecus and Homo. Reorganization of the central cranial base is among the earliest morphological markers of the Ardipithecus + Australopithecus + Homo clade.
    Proceedings of the National Academy of Sciences 01/2014; DOI:10.1073/pnas.1322639111 · 9.81 Impact Factor
  • Tim D White
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    ABSTRACT: Evolutionary biologists created a large twentieth-century literature about delimiting biological species. Paleontologists contributed the unique complications of deep time. Toward century's end, one participant wrote: "In all probability more paper has been consumed on the questions of the nature and definition of the species than any other subject in evolutionary and systematic biology."
    Evolutionary Anthropology Issues News and Reviews 01/2014; 23(1):30-2. DOI:10.1002/evan.21391 · 3.59 Impact Factor
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  • Tim White
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    ABSTRACT: Two new fossil jawbones from Kenya are claimed to confirm a diversity of early Homo species. However, archaic species concepts and an inadequate fossil record continue to obscure the origins of our genus.
    Current biology: CB 02/2013; 23(3):R112-5. DOI:10.1016/j.cub.2012.12.001 · 9.92 Impact Factor
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    ABSTRACT: Beginning in the 1960s, geological and paleoanthropological exploration of the Ethiopian rift system’s basins have led to the discovery and assembly of the most comprehensive record of human biological and technological change during the last 6 million years. The hominid fossils, including partial skeletons, were primarily discovered in the Afar Rift, the Main Ethiopian Rift, and in the Omo Basin of the broadly rifted zone of SW Ethiopia. The paleoanthropological research areas within the SW Afar Rift that have yielded many diverse hominid species and the oldest stone tools are, from north to south, Woranso-Mille (aff. Ardipithecus and Au. afarensis), Hadar (Au. afarensis, Homo sp.), Dikika (Au. afarensis), Gona (Ar. kadabba, Ar. ramidus, H. erectus, and oldest stone tools), Middle Awash (Ar. kadabba, Ar. ramidus, Au. anamensis, Au. afarensis, Au. garhi, H. erectus, H. rhodesiensis, H. sapiens idaltu, and the oldest paleo-butchery locality), and Galili (Au. afarensis). Additional hominid remains were discovered at Melka Kunture on the banks of the Awash River near its source along the western margin of the central part of the Main Ethiopian Rift (H. erectus), at Konso (H. erectus and A. boisei), and at the southern end of the MER, and in the Omo Basin (Au. anamensis, Au. afarensis, Au. aethiopicus, Au. boisei, H. habilis, and H. erectus).Distal and sometimes proximal tephra units interbedded within fossilifeous sedimentary deposits have become key elements in this work by providing chronological and correlative control and depositional contexts. Several regional tephra markers have been identified within the northern half of the eastern African rift valley in Ethiopia and Kenya, and in marine sediments of the Gulf of Aden Rift and the NW Indian Ocean. Out of the many regional tephra stratigraphic markers that range in age from the early Pliocene (3.97 Ma) to the late Pleistocene (0.16 Ma), the Sidi Hakoma Tuff (SHT) has been more widely identified and thoroughly characterized than any of the others.An age of 3.446 ± 0.041 Ma was determined on the SHT according to the most recent calibration, and it is the only regional stratigraphic marker whose source has been traced to a buried caldera in the central sector of the Main Ethiopian Rift. This paper describes new SHT occurrences and presents chemical and chronological results in the context of a broader review of the importance of this key marker. Moreover, the geographic distributions, probable dispersal mechanisms, and importance of regional tephra units in determining the tectonic and sedimentological processes in the different rift basins of the eastern African rift valleys are considered.
    Journal of African Earth Sciences 01/2013; 77:41–58. DOI:10.1016/j.jafrearsci.2012.09.004 · 1.38 Impact Factor
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    ABSTRACT: Based on the analysis of computed tomography (CT) scan imagery, Morimoto et al. (Anatomical Record 2011; 294:1433-1445) concluded that the proximal femoral shaft attachment of the chimpanzee gluteus maximus (GM) lies in a position similar to that of modern humans (medial to a longitudinal bony structure that runs superoinferiorly along the lateral proximal shaft), contradicting the previous reports of similarity with the other extant apes. Based on a broader comparative osteological perspective and examination of some of the same CT imageries, we here demonstrate that: 1) although the chimpanzee insertion of the GM appears to lie more posteromedially than it does in gorillas and orangutans, the validity of the extent of this reassessment remains in doubt, pending crossvalidation of CT analyses by parallel dissections of the imaged specimens, and 2) the chimpanzee and human conditions are, nevertheless, distinct. We agree with Morimoto et al. (Anatomical Record 2011; 294:1433-1445) that these observations support the interpretation that superficially similar osteological topographies of the proximal femur were acquired independently by chimpanzees and gorillas, but we disagree about the significance of their suggested human-chimpanzee similarities. Although Morimoto et al. (Anatomical Record 2011; 294:1433-1445) considered these to be shared-derived features of the chimpanzee-human clade, we instead argue that the shared absence of strong anterolateral displacement of the GM attachment among chimpanzees, basal hominids (such as Orrorin and Ardipithecus), and humans likely reflects the primitive condition characteristic of a wide range of Miocene apes. Anat Rec, 2012. © 2012 Wiley Periodicals, Inc.
    The Anatomical Record Advances in Integrative Anatomy and Evolutionary Biology 12/2012; 295(12). DOI:10.1002/ar.22604 · 1.53 Impact Factor
  • Tim D White
    Science 07/2012; 337(6093):423. DOI:10.1126/science.1225988 · 31.48 Impact Factor
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    Science 05/2011; 332(6032):916. DOI:10.1126/science.332.6032.916-a · 31.48 Impact Factor
  • Tim D. White
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    ABSTRACT: Today, thanks to a range of discoveries and technologies, we can tell in amazing detail the story that Darwin only guessed at
    The New Scientist 11/2010; 208(2785). DOI:10.1016/S0262-4079(10)62761-3 · 0.38 Impact Factor
  • Tim D. White
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    ABSTRACT: Our direct ancestors spread out from Africa long after the first hominid exodus, and they were anatomically and behaviourally much more human
    The New Scientist 11/2010; 208. DOI:10.1016/S0262-4079(10)62763-7 · 0.38 Impact Factor
  • Tim D. White
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    ABSTRACT: Our evolutionary history has important lessons for us - all of our closest relatives have gone extinct, leaving only more distant African apes
    The New Scientist 11/2010; 208(2785). DOI:10.1016/S0262-4079(10)62764-9 · 0.38 Impact Factor
  • Tim D. White
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    ABSTRACT: A mountain of evidence has accumulated showing that our ancestors emerged in Africa. What is less clear-cut is what spurred their evolution
    The New Scientist 11/2010; 208(2785). DOI:10.1016/S0262-4079(10)62762-5 · 0.38 Impact Factor
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    ABSTRACT: Cerling et al. contest our interpretation of the woodland habitat preference of Ardipithecus ramidus. However, their reconstruction of a predominantly open grassy environment with riparian woodlands is inconsistent with the totality of the fossil, geological, and geochemical evidence. In the Middle Awash, Ar. ramidus fossils are confined to the western portion of the sampled Pliocene landscape where the species is associated with woodland to grassy woodland habitat indicators.
    Science 05/2010; 328(5982):1105-1105. DOI:10.1126/science.1185466 · 31.48 Impact Factor
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    Tim D. White, Gen Suwa, C. Owen Lovejoy
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    ABSTRACT: We assigned Ardipithecus to the Hominidae based on numerous dental, cranial, and postcranial characters. Sarmiento argues that these characters are not exclusive to hominids, contending that Ardipithecus is too old to be cladistically hominid. His alternative phylogeny, however, is unlikely because it requires tortuous, nonparsimonious evolutionary pathways.
    Science 05/2010; 328(5982):1105-1105. DOI:10.1126/science.1185462 · 31.48 Impact Factor

Publication Stats

6k Citations
1,847.25 Total Impact Points

Institutions

  • 1978–2014
    • University of California, Berkeley
      • • Department of Integrative Biology
      • • Human Evolution Research Center (HERC)
      • • Museum of Vertebrate Zoology
      • • Department of Anthropology
      Berkeley, California, United States
  • 2009
    • CSU Mentor
      Long Beach, California, United States
  • 2005
    • Liverpool John Moores University
      Liverpool, England, United Kingdom
  • 2003
    • Université de Poitiers
      Poitiers, Poitou-Charentes, France
  • 1984
    • Cleveland Museum of Natural History
      Cleveland, Ohio, United States