Tiny, 540-Million-Year-Old Human Ancestor Didn't Have an Anus

A speck-size creature without an anus is the oldest known prehistoric ancestor of humans, a new study finds.

Researchers found the remains of the 540-million-year-old critter — a bag-like sea organism — in central China. The creature is so novel, it has its own family (Saccorhytidae), as...

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