Researchers have described a previously unknown sauropod dinosaur from fossils found in Argentina's Chubut province. The creature, called Bicharracosaurus dionidei, reached about 20 meters in length and lived around 155 million years ago.

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Scientists have determined that structures once seen as traces of tiny animals in 540-million-year-old Brazilian rocks are actually fossilized communities of bacteria and algae. The reexamination uses advanced imaging to reveal preserved cells and organic material.

A 250-million-year-old fossil egg containing a Lystrosaurus embryo has provided the first direct evidence that mammal ancestors laid eggs. Discovered in South Africa, the find resolves a decades-old question about early mammalian reproduction following the End-Permian extinction. Researchers used advanced imaging to reveal the embryo's pre-hatching stage inside a soft-shelled egg.

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Researchers have identified a 500-million-year-old fossil from Utah as Megachelicerax cousteaui, the earliest known chelicerate and relative of spiders, scorpions and horseshoe crabs. The discovery, detailed in a Nature study, extends the group's evolutionary history by 20 million years to the Cambrian period. A tiny claw uncovered during preparation confirmed its significance.

 

 

 

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