Fossils of Saccorhytus are well preserved and revealed new insight about our ancestors, a millimeter-long creature with a sack-like body that lived some 540 million years ago, were studied by researchers at Cambridge University in the United Kingdom and Northwest University in Xi’an China who believe it to be the earliest prehistoric ancestor for humans and many other species. The team published a paper on their work in the journal Nature.
According to the international team’s findings, humanity’s earliest known ancestor had a mouth but no anus. Its body shape and lack of an anus likely means that both food and digested waste were passed through the creature’s mouth. Thank god we evolved and no not doing that anymore.