Russian paleontologists have described new frog remains discovered at the Guurilin-Tsav site in southern Mongolia’s Gobi Desert. The fossils date to the late Cretaceous period (Maastrichtian stage, 72–66 million years ago). The team identified two groups: Gobiatids (extinct primitive frogs) and anurans resembling modern round-toed frogs. The key finding is that this frog fauna exhibited remarkable stability — it persisted almost unchanged for about 30 million years, even as dinosaurs were going extinct around them. This suggests low diversity, high endemism, and a resilient ecological niche in late Mesozoic Asia.
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