Mystery Of Half-Billion-Year-Old Creature With No Anus Solved

  • Scientists say they have solved an evolutionary mystery involving a 500 million-year-old microscopic, spiny creature with a mouth but no anus.
  • When it was discovered in 2017, it was reported that┬áthe tiny fossil of this sack-like marine beast could be humans’ earliest-known ancestor.
  • The ancient animal, Saccorhytus coronarius, was tentatively placed into a group called the deuterostomes.
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