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  • Traditional "explanation" of BPism :-DDD

    From [email protected]@21:1/5 to All on Sun Jan 29 12:46:04 2023
    Homoplasy in the evolution of modern human-like joint proportions in Australopithecus afarensis
    Anjali M Prabhat cs 2021 eLife 10: e65897 doi 10.7554/eLife.65897

    The evolution of BPism & reduced reliance on arboreality in hominins resulted in larger lower limb joints vsthe joints of the upper limb,
    but the pattern & timing of this transition remains unresolved.
    Here, we find the limb joint proportions of Au.afarensis, H. erectus & H.naledi to resemble H.sapiens,
    but Au.africanus, Au.sediba, Par.robustus, Par.boisei, H.habilis & H.floresiensis are more ape-like.
    The homology of limb joint proportions in Au.afarensis & H.sapiens can only be explained by a series of evol. reversals, irrespective of differing phylogenetic hypotheses:
    the independent evolution of sapiens-like limb joint proportions in Au.afarensis is a more parsimonious explanation.
    Overall, these results support an emerging perspective in hominin paleo-biology that Au.afarensis was the most terrestrially adapted australopith, despite the importance of arboreality throughout much of early hominin evolution.

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  • From JTEM is so reasonable@21:1/5 to [email protected] on Sun Jan 29 15:18:22 2023
    [email protected] wrote:

    The evolution of BPism & reduced reliance on arboreality in hominins resulted in larger lower limb joints vsthe
    joints of the upper limb, but the pattern & timing of this transition remains unresolved.

    Dating? Unresolved.

    Timing? Bipedalism had to happen first.

    They were shaped by selective pressures. The water cuts a channel through the rock by
    flowing. The water comes first. In this analogy the water is the selective pressures, the
    evolution of the joints, the position of the foramen magnum...

    Here, we find the limb joint proportions of Au.afarensis, H. erectus & H.naledi to resemble H.sapiens

    As would the joints of the LCA, the ancestor of Chimps.

    Now THAT is where the dating comes in...





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    https://jtem.tumblr.com/tagged/panic/page/2

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