Long bone microstructure gives new insights into the life of pachypleurosaurids from the Middle Triassic of Monte San Giorgio, Switzerland/Italy

A detailed analysis of long bone microstructure in four pachypleurosaurid taxa from Monte San Giorgio reveals distinct adaptations to secondary aquatic lifestyles, supporting earlier findings on habitat diversity and reproductive strategies. The study highlights high compactness values in their bones, characterized by a thick cortex and persistent calcified cartilaginous core, with variations in remodeling processes, growth cycle spacing, and vascularization. These differences suggest varying longevities, ages at sexual maturity, and potential climate-dependent reproductive seasons akin to modern squamates. The research combines histological data with morphological and facies distribution studies, offering new insights into the life history of these Middle Triassic reptiles.

Hugi, J., Scheyer, T. M., Sander, P. M., Klein, N., & Sánchez-Villagra, M. R. (2011). Long bone microstructure gives new insights into the life of pachypleurosaurids from the Middle Triassic of Monte San Giorgio, Switzerland/Italy. Comptes Rendus Palevol, 10(5-6), 413–426. https://doi.org/10.1016/j.crpv.2011.03.009