A 500 million-year-old microscopic, spiny creature with a mouth but no anus had puzzled scientists.
Scientists say they have solved an evolutionary mystery involving a 500 million-year-old microscopic, spiny creature with a mouth but no anus.the tiny fossil of this sack-like marine beast could be humans' earliest-known ancestor.
One "intriguing option", she said, is that an even earlier ancestor of this whole group did not have an anus, and that Saccorhytus evolved after that. When scientists looked in more detail - using powerful X-rays to examine the 1mm creature closely - they realised that these were actually the base of spines that had snapped off.
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