Lystrosaurus eggs discovered
Finding very old (Triassic) egg fossils
is a GREAT discovery, even if a ‘shell’ was not preserved.
Legendre et al 2022 reported,
“the eggshells of monotremes, the only extant egg‐laying amniotes outside reptiles, have been poorly studied.”
Here are the DGS elements of the embryo Lystrosaurus
in situ and in vivo. Notable is the lack of any skeletal element beyond the knee – as in newly hatched monotremes and newly born marsupials. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0345016
is much larger and relatively larger than typical in basal mammals. The authors report, “Comparing egg sizes amongst amniotes reveals that Lystrosaurus laid relatively large eggs for a non-avian amniote, regardless of the body size considered.”
is in the text, but several times it appears in citation titles because Lystrosaurus is famous for making burrows. Such dens would have been suitable to ideal for raising helpless young – perhaps fed by herbivorous regurgitating mothers.
of an echidna embryo hatching from its soft egg for comparison. https://www.youtube.com/watch?v=dHocViqKbbc
Legendre LJ, Choi S and Clarke JA 2022. The diverse terminology of reptile eggshell microstructure and its effect on phylogenetic comparative analyses. Journal of Anatomy: 241(3):641–666. doi: 10.1111/joa.13723
Publicity
https://interestingengineering.com/science/fossil-egg-lystrosaurus-mammal-ancestor
Source: https://pterosaurheresies.wordpress.com/2026/04/16/lystrosaurus-eggs-discovered/
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