Project 3730: Mongle C.S., Strait D.S., Grine F.E. 2023. An updated analysis of hominin phylogeny with an emphasis on re-evaluating the phylogenetic relationships of Australopithecus sediba. Journal of Human Evolution. 175:103311.
Specimen: Australopithecus sediba (unvouchered)
View: Anterior

Abstract

The discovery and description of Australopithecus sediba has reignited the debate over the evolutionary history of the australopiths and the genus Homo. It has been suggested that A. sediba may be an ancestor of Homo because it possesses a mosaic of derived Homo-like and primitive australopith-like traits. However, an alternative hypothesis proposes that the majority of the purported Homo-like craniodental characters can be attributed to the juvenile status of the type specimen, MH1. We conducted an independent character assessment of the craniodental morphology of A. sediba, with particular emphasis on evaluating whether the ontogenetic status of MH1 may have affected its purported Homo-like characteristics. In doing so, we have also expanded fossil hypodigms to incorporate the new Australopithecus anamensis cranium from Woranso Mille (MRD-VP-1/1), as well as recently described Paranthropus robustus cranial remains from Drimolen (DNH 7, DNH 155). Morphological character data were analyzed using both standard parsimony and Bayesian techniques. In addition, we conducted a series of Bayesian analyses constrained to evaluate the hypothesis that Australopithecus africanus and A. sediba are sister taxa. Based on the results of the parsimony and Bayesian analyses, we could not reject the hypothesis that A. sediba shares its closest phylogenetic affinities with the genus Homo. Therefore, based on currently available craniodental evidence, we conclude that A. sediba is plausibly the terminal end of a lineage that shared a common ancestor with the earliest representatives of Homo. We caution, however, that the discovery of new A. sediba fossils preserving adult cranial morphology, or the inclusion of postcranial characters may ultimately necessitate a reevaluation of this hypothesis.


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Article DOI: 10.1016/j.jhevol.2022.103311

Project DOI: 10.7934/P3730, http://dx.doi.org/10.7934/P3730
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 21 Taxa
  • 1 Specimen
  • 107 Characters
Total size of project's media files: 68.97k

Download Project SDD File
Total scored cells: 1849
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 107
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 326
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:12/95
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MorphoBank Project 3730

    This research
    supported by

    Authors' Institutions

    • University of Johannesburg

    • Washington University - Saint Louis (WUSTL)

    • American Museum of Natural History

    • Stony Brook University



    Members

    member name taxa specimens media chars character
    notes  media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Carrie Mongle
    Project Administrator
    2111107107001849
    (1849, 0, 0)
    000


    Taxonomic Overview for Matrix 'M28777' (21 Taxa)

    taxon unscored
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    NPA
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    "-" cellscell images labels on
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    [1] Colobus guereza
    Last Modified in 05/20/22
    410310300001
    [2] Papio
    Last Modified in 05/20/22
    210510500001
    [3] Hylobates
    Last Modified in 05/20/22
    110610600001
    [4] Pongo pygmaeus
    Last Modified in 05/20/22
    010710700001
    [5] Gorilla gorilla
    Last Modified in 05/20/22
    010710700001
    [6] Pan troglodytes
    Last Modified in 05/20/22
    010710700001
    [7] Sahelanthropus tchadensis
    Last Modified in 05/20/22
    57505000001
    [8] Ardipithecus ramidus
    Last Modified in 05/20/22
    24838300001
    [9] Australopithecus anamensis
    Last Modified in 05/20/22
    35727200001
    [10] Australopithecus afarensis
    Last Modified in 05/20/22
    410310300001
    [11] Kenyanthropus platyops
    Last Modified in 05/20/22
    79282800001
    [12] Australopithecus garhi
    Last Modified in 05/20/22
    77303000001
    [13] Australopithecus africanus
    Last Modified in 05/20/22
    010710700001
    [14] Australopithecus sediba
    Last Modified in 05/20/22
    44636300001
    [15] Paranthropus aethiopicus
    Last Modified in 05/20/22
    26818100001
    [16] Paranthropus robustus
    Last Modified in 05/20/22
    210610500001
    [17] Paranthropus boisei
    Last Modified in 05/20/22
    110610600001
    [18] Homo habilis
    Last Modified in 05/20/22
    510210200001
    [19] Homo rudolfensis
    Last Modified in 05/20/22
    29797800001
    [20] Homo ergaster
    Last Modified in 05/20/22
    10979700001
    [21] Homo sapiens
    Last Modified in 05/20/22
    010710700001


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    Project overview476
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    Media views916Media search (775 views); M688002 (141 views);
    Taxon list1214
    Views for media list272
    Specimen list494
    Bibliography175
    Documents list1




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    Total downloads from project69
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    Matrix downloads44Craniodental character matrix (44 downloads);