Palaeontologists found the fossil in January 2020 while searching for feathered dinosaurs in Santa Cruz province in Argentina. “They did not achieve their goal,” says Mariana Chuliver at ...
The 550-million-year-old Quaestio simpsonorum is the first fossil to show a definitive left-right asymmetry, an important sign of evolutionary development in the history of animals. In 1947 ...
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