Abstract
A Cretaceous eucosmodont multituberculate mammal skeleton has been found in Mongolia with all of the bony elements of the shoulder girdle in place. This specimen demonstrates a different forelimb stance from that recently hypothesized for another Cretaceous eucosmodont. Primitively, it retains a separate ossified inter-clavicle, as in monotremes and non-mammalian cynodonts. In other respects it shares with therians and their extinct allies key features associated with mobility of the pectoral girdle and shoulder joint during locomotion, and a more parasagittal forelimb posture. This locomotor transformation appears to have evolved just once among the common ancestors of multituberculates and therians, some time before the Late Jurassic.
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Sereno, P., McKenna, M. Cretaceous multituberculate skeleton and the early evolution of the mammalian shoulder girdle. Nature 377, 144–147 (1995). https://doi.org/10.1038/377144a0
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DOI: https://doi.org/10.1038/377144a0
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