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Hadrocodium (Jurassic mammaliaform) skull morphology (free pdf)

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Ben Creisler

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Jan 24, 2025, 3:40:21 PMJan 24
to DinosaurMa...@googlegroups.com
Ben Creisler

A new paper:

Free pdf:

Molly Tumelty & Stephan Lautenschlager (2025)
Is cranial anatomy indicative of fossoriality? A case study of the mammaliaform Hadrocodium wui
The Anatomical Record (advance online publication)
doi: https://doi.org/10.1002/ar.25630
https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.25630

Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/epdf/10.1002/ar.25630


Determining the ecology of fossil species presents considerable challenges due to the often fragmentary preservation of specimens. The mammaliaform Hadrocodium wui from the Jurassic of China is known only from the cranium and mandible but may have had a fossorial lifestyle. It shares morphological similarities with talpid moles and soricid shrews and is closely related to other fossorial mammaliaforms. However, the lack of postcranial elements has so far precluded a definitive assessment regarding its fossorial behavior. Using a combination of geometric morphometric analysis of the lower mandible and finite element analyses of the cranium, comparisons between H. wui and extant groups are made. H. wui resembles talpid moles more closely than shrews in mandible shape. However, there are more similarities between H. wui and semi-fossorial/semi-aquatic moles than fully fossorial moles. The skull of H. wui is particularly weak in every tested biomechanical scenario when compared to the related mammaliaform Morganucodon oehleri and talpid moles. This weakness is potentially a result of the reduction in thickness of the zygomatic arch. In contrast, the shrew crania show similar stress magnitudes and distribution. These results imply that H. wui was not fully fossorial and fed on a diet of softer invertebrates. Skull morphology may therefore not be sufficient to infer fossoriality in forelimb-digging species.

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