Paleontologists have discovered a 240-million-year-old fossil in China that contains the oldest known preserved stomach, liver, and intestinal tissues of a reptile. This fossil, identified as Austronaga minuta from the Early Triassic period, provides evidence that stem-archosaurs with aquatic adaptations existed earlier than previously understood. The find offers a unique window into the evolutionary transition of Triassic reptiles from terrestrial to marine environments. AI
RANK_REASON Discovery of a fossil with preserved soft tissue and implications for evolutionary history. [lever_c_demoted from research: ic=1 ai=0.0]
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