
Early mammaliaforms, such as the Middle Jurassic docodontan Krusatodon, exhibited a prolonged life history with slower growth and longer maximum lifespan compared to modern small mammals.


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Juvenile and adult skeletons of Middle Jurassic Krusatodon from the Isle of Skye, Scotland, show that this mouse-sized mammaliaform had longer development and lifespan than modern mammals of similar mass.

Jurassic fossil juvenile reveals prolonged life history in early mammals - Nature

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Jurassic Fossil Reveals Prolonged Life History in Early Mammals
