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Paleontology

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Dinocephalosaurus

PREHISTORIC PREGNANCY  With a long-necked body not suited to walking, an ancient marine reptile Dinocephalosaurus (illustrated) may have evolved to give live birth in the ocean rather than lay eggs on land, a new study suggests.

horse evolution

HORSE RACE  As ancient horses rapidly diversified into new species, drastic changes in body size didn’t occur, despite the diversity found in the fossil record, a new analysis shows. (Three species from roughly 8 million years ago are shown.)

deuterostome fossil

MOUTHING OFF  New fossils show tiny creatures with accordion mouths (one shown) that lived 540 million years ago. The animals are the earliest known deuterostomes, a category so big it includes everything from humans to starfish.

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