Tag Archives: deuterostome

Bag-like Sea Creature Was Humans’ Oldest Known Ancestor

Researchers have identified traces of what they believe is the earliest known prehistoric ancestor of humans—a microscopic, bag-like sea creature, which lived about 540 million years ago. Named Saccorhytus, after the sack-like features created by its elliptical body and large mouth, the species is new to science and was identified from microfossils found in China.

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It is thought to be the most primitive example of a so-called “deuterostome”—a broad biological category that encompasses a number of sub-groups, including the vertebrates. If the conclusions of the study, published in the journal Nature, are correct, then Saccorhytus was the common ancestor of a huge range of species, and the earliest step yet discovered on the evolutionary path that eventually led to humans, hundreds of millions of years late Read more