When the saccorhytus was discovered in 2017 it was believed the spikey, wrinkly sack could be humans' oldest ancestor.
abc.net.au/news/creature-with-no-anus-not-related-to-humans/101349556Researchers have discovered a mysterious creature with a mouth but no anus is not an ancestor of humans after all.New research has shown the saccorhytus is not a deep relative of humans as was believed when it was first discovered
However, extensive analysis of 500 million-year-old fossils from China has shown that the holes around the mouth on the saccorhytus are bases of spines that broke away during the preservation of the fossils. Researchers from Chang'an University and the University of Bristol believe the saccorhytus is an ecdysoszoan, which is a group that contains arthropods and nematodes.
"To resolve the problem our computational analysis compared the anatomy of saccorhytus with all other living groups of animals, concluding a relationship with the arthropods and their kin, the group to which insects, crabs and roundworms belong."
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