The extraordinary osteology and functional morphology of the limbs in Palorchestidae, a family of strange extinct marsupial giants


Autoři: Hazel L. Richards aff001;  Rod T. Wells aff003;  Alistair R. Evans aff001;  Erich M. G. Fitzgerald aff002;  Justin W. Adams aff002
Působiště autorů: School of Biological Sciences, Monash University, Clayton, Victoria, Australia aff001;  Geosciences, Museums Victoria, Melbourne, Victoria, Australia aff002;  Ecology and Evolution, College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia aff003;  Palaeontology, South Australian Museum, Adelaide, South Australia, Australia aff004;  Department of Anatomy & Developmental Biology, School of Biomedical Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia aff005
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0221824

Souhrn

The Palorchestidae are a family of marsupial megafauna occurring across the eastern Australian continent from the late Oligocene through to their extinction in the Late Pleistocene. The group is known for their odd ‘tapir-like’ crania and distinctive clawed forelimbs, but their appendicular anatomy has never been formally described. We provide the first descriptions of the appendicular skeleton and body mass estimates for three palorchestid species, presenting newly-identified, and in some cases associated, material of mid-Miocene Propalorchestes, Plio-Pleistocene Palorchestes parvus and Pleistocene Palorchestes azael alongside detailed comparisons with extant and fossil vombatiform marsupials. We propose postcranial diagnostic characters at the family, genus and species level. Specialisation in the palorchestid appendicular skeleton evidently occurred much later than in the cranium and instead correlates with increasing body size within the lineage. We conclude that palorchestid forelimbs were highly specialised for the manipulation of their environment in the acquisition of browse, and that they may have adopted bipedal postures to feed. Our results indicate palorchestids were bigger than previously thought, with the largest species likely weighing over 1000 kg. Additionally, we show that P. azael exhibits some of the most unusual forelimb morphology of any mammal, with a uniquely fixed humeroulnar joint unlike any of their marsupial kin, living or extinct.

Klíčová slova:

Biology and life sciences – Anatomy – Musculoskeletal system – Skeletal joints – Body limbs – Biological tissue – Connective tissue – Organisms – Eukaryota – Animals – Prehistoric animals – Diprotodon – Paleontology – Paleobiology – Paleozoology – Vertebrate paleontology – Medicine and health sciences – Skeleton – Humerus – Arms – Bone – Earth sciences


Zdroje

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