Pinhead-sized sea creature was a bag with a mouth

Anus may have been absent in odd new fossils from 540 million years ago

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.

J. Han et al/ Nature 2017

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