evolution

A 90-million-year-old skeleton from Argentina reveals that alvarezsaur dinosaurs shrank to under two pounds before evolving their hallmark ant-eating adaptations, upending decades of evolutionary assumptions.

Spinosaurus mirabilis, the first new spinosaurid species in over a century, has been identified from fossils in Niger's Sahara, challenging the view that these predators were coastal.

Paleontologists report paired discoveries from China that rewrite the early chapter of bony fish evolution and, by extension, the evolutionary lineage leading to all living vertebrates including humans.

A team led by the University of Chicago has named Spinosaurus mirabilis, a scimitar-crested, fish-eating theropod found 500–1,000 km from the nearest ancient sea, reshaping what scientists know about where spinosaurs lived.