In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: Lystrosaurus. Now, a stunning fossil discovery—an ancient egg containing a curled-up embryo—has finally answered a decades-old mystery about whether mammal ancestors laid eggs. Using advanced imaging technology, scientists confirmed that these resilient creatures did reproduce this way, likely producing large, soft-shelled eggs packed with nutrients.

Summary:

In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: Lystrosaurus. Now, a stunning fossil discovery—an ancient egg containing a curled-up embryo—has finally answered a decades-old mystery about whether mammal ancestors laid eggs. Using advanced imaging technology, scientists confirmed that these resilient creatures did reproduce this way, likely producing large, soft-shelled eggs packed with nutrients.

Julien Benoit, Vincent Fernandez, Jennifer Botha. The first non-mammalian synapsid embryo from the Triassic of South Africa. PLOS One, 2026; 21 (4): e0345016 DOI: 10.1371/journal.pone.0345016

  • mika_mika@lemmy.worldEnglish
    4·
    1 month ago

    Any mammalogist would know mammal ancestors laid eggs. This was never a fucking mystery.

    “Researchers found preserved egg of mammal ancestor” I guess isn’t as spicy.