Scientists say they have solved an evolutionary mystery involving a 500 million-year-old microscopic, spiny creature with a mouth but no anus. (These are the primitive ancestors of vertebrates - including humans.)
When it was discovered in 2017, it was reported that the tiny fossil of this sack-like marine beast could be humans' earliest-known ancestor.
The ancient animal, Saccorhytus coronaries, was tentatively placed into a group called the deuterostomes.
Scientists speculate the reason it went extinct was because it was severely 'anal retentive!'
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