Vertebral numbers and human evolution

Scott Williams, Emily R. Middleton, Catalina I. Villamil, Milena R. Shattuck

    Research output: Contribution to journalArticle

    Abstract

    Ever since Tyson (1699), anatomists have noted and compared differences in the regional numbers of vertebrae among humans and other hominoids. Subsequent workers interpreted these differences in phylogenetic, functional, and behavioral frameworks and speculated on the history of vertebral numbers during human evolution. Even in a modern phylogenetic framework and with greatly expanded sample sizes of hominoid species, researchers' conclusions vary drastically, positing that hominins evolved from either a "long-backed" (numerically long lumbar column) or a "short-backed" (numerically short lumbar column) ancestor. We show that these disparate interpretations are due in part to the use of different criteria for what defines a lumbar vertebra, but argue that, regardless of which lumbar definition is used, hominins are similar to their great ape relatives in possessing a short trunk, a rare occurrence in mammals and one that defines the clade Hominoidea. Furthermore, we address the recent claim that the early hominin thoracolumbar configuration is not distinct from that of modern humans and conclude that early hominins show evidence of "cranial shifting," which might explain the anomalous morphology of several early hominin fossils. Finally, we evaluate the competing hypotheses on numbers of vertebrae and argue that the current data support a hominin ancestor with an African ape-like short trunk and lower back. Am J Phys Anthropol 159:S19-S36, 2016.

    Original languageEnglish (US)
    Pages (from-to)S19-S36
    JournalAmerican Journal of Physical Anthropology
    Volume159
    DOIs
    StatePublished - Jan 1 2016

    Fingerprint

    Hominidae
    worker
    interpretation
    history
    evidence
    Spine
    Anatomists
    Lumbar Vertebrae
    Fossils
    Sample Size
    Mammals
    History
    Research Personnel

    Keywords

    • Australopithecus
    • lumbar
    • ribcage
    • transitional vertebra
    • zygapophyseal joints

    ASJC Scopus subject areas

    • Anatomy
    • Anthropology

    Cite this

    Williams, S., Middleton, E. R., Villamil, C. I., & Shattuck, M. R. (2016). Vertebral numbers and human evolution. American Journal of Physical Anthropology, 159, S19-S36. https://doi.org/10.1002/ajpa.22901

    Vertebral numbers and human evolution. / Williams, Scott; Middleton, Emily R.; Villamil, Catalina I.; Shattuck, Milena R.

    In: American Journal of Physical Anthropology, Vol. 159, 01.01.2016, p. S19-S36.

    Research output: Contribution to journalArticle

    Williams, S, Middleton, ER, Villamil, CI & Shattuck, MR 2016, 'Vertebral numbers and human evolution', American Journal of Physical Anthropology, vol. 159, pp. S19-S36. https://doi.org/10.1002/ajpa.22901
    Williams S, Middleton ER, Villamil CI, Shattuck MR. Vertebral numbers and human evolution. American Journal of Physical Anthropology. 2016 Jan 1;159:S19-S36. https://doi.org/10.1002/ajpa.22901
    Williams, Scott ; Middleton, Emily R. ; Villamil, Catalina I. ; Shattuck, Milena R. / Vertebral numbers and human evolution. In: American Journal of Physical Anthropology. 2016 ; Vol. 159. pp. S19-S36.
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