Project 4023: Zoe T. Kulik, Jacqueline K. Lungmus, Kenneth D. Angielczyk, Christian A. Sidor. 2021. Living Fast in the Triassic: New data on life history in Lystrosaurus (Therapsida: Dicynodontia) from northeastern Pangea. PLOS ONE. (In Press)
Specimen: † Lystrosaurus sp. (IVPP/Vert Paleontology:IVPP V26548)
View: fibula midshaft thin section

Abstract

Lystrosaurus was one of the few tetrapod genera to survive the Permo-Triassic mass extinction, the most profound biotic crisis in Earth's history. The wide paleolatitudinal range and incredible abundance of Lystrosaurus during the Early Triassic provides a unique opportunity to investigate changes in growth dynamics and longevity following the mass extinction, yet most studies have focused only on species that lived in the southern hemisphere. Here, we present the long bone histology from twenty Lystrosaurus skeletal elements spanning a range of sizes that were collected in the Jiucaiyuan Formation of northwestern China. In addition, we compare the average body size of northern and southern Pangean Triassic-aged species, and conduct cranial geometric morphometric analyses of southern and northern specimens to begin investigating whether populations from China are likely to be distinct from South African populations. We demonstrate that Lystrosaurus from China have larger average body sizes than their southern Pangean relatives and that the Chinese and South African populations have distinct cranial morphologies. Our osteohistological examination revealed sustained, rapid osteogenesis punctuated by growth marks, in some, but not all immature individuals from China. We find that the osteohistology of Chinese Lystrosaurus shares a similar growth pattern to South African species that show sustained growth until death. However, bone growth arrests more frequently in the Chinese sample. Nevertheless, each of the long bones sampled here do not indicate that maximum or asymptotic size was reached, suggesting that the maximum size of Lystrosaurus from the Jiucaiyuan Formation remains unknown.


Project DOI: 10.7934/P4023, http://dx.doi.org/10.7934/P4023
This project contains
  • 20 Media
  • 3 Folios
  • 1 Taxon
  • 5 Specimens
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MorphoBank Project 4023
  • Creation Date:
    02 June 2021
  • Publication Date:
    21 October 2021
  • Project views: 543

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    Authors' Institutions

    • University of Washington



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    Zoe Kulik
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