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Re: [dinosaur] Juvenile sauropodomorph specimen from Lower Jurassic of China



No new taxon named; specimen is described as Massopoda indet.

On Wed, 31 Mar 2021 at 11:06, Ben Creisler <bcreisler@gmail.com> wrote:

Ben Creisler
bcreisler@gmail.com

A new paper:

[Note that this paper will have a free pdf on a Chinese website when it's officially published. I don't know if a new taxon is named in the paper itself.]

Claire Peyre de FabrÃgues, Shundong BI, Tianyu AI Â& Xing XU (2021)
A Juvenile Specimen of Sauropodomorpha from the Lower Jurassic of China and a Brief Review of the Lufeng Sauropodomorph Fauna.
Acta Geologica Sinica â English Edition (advance online publication)
doi: https://doi.org/10.1111/1755-6724.14707
https://onlinelibrary.wiley.com/doi/10.1111/1755-6724.14707



An incomplete dinosaur skeleton, including a partial skull, recently discovered from the Lower Jurassic Lufeng Formation of Yunnan, China, is here described. Except for its small size, little anatomical evidence supports, a priori, the nonâadult status of this new sauropodomorph specimen. Thus, osteohistological analyses were conducted, which suggest that the new specimen is a fastâgrowing juvenile. Despite the abundant early sauropodomorph fossils collected from the Lufeng Formation, it represents only the second occurrence of a juvenile nonâsauropodan sauropodomorph in the Lufeng Basin. The anatomy of the specimen does not match that of other Lower Jurassic immature specimens. Although cranial material is preserved, it does not display diagnostic characters of the early sauropodomorphs from the same horizon, namely Lufengosaurus, Yizhousaurus and Yunnanosaurus. Our phylogenetic analysis, which places the new specimen in a position relatively distant to other Chinese sauropodomorphs, corroborates the systematic hypothesis indicated by the anatomical evidence that it is not referable to a species already excavated in Yunnan. However, this result should be interpreted with caution considering that ontogeny affects phylogenetic reconstruction. A thorough comparison with adult forms, taking into account ontogenyârelated characters, suggests that this new juvenile specimen could represent an unknown species of early sauropodomorph.


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