A microorganism whose evolutionary roots can be traced to the era of the first multicellular animals may provide a glimpse of how single-celled organisms made a critical evolutionary leap. In ...

A newly identified primate species from Wyoming is challenging a long-standing model of early primate evolution. The species, Tetonius varleyorum, lived about 55 million years ago and combines ...

To study evolutionary morphings, scientists often look at teeth, which are well preserved and thus well represented in the fossil record. But scientists can do more than observe the traces left behind ...

Choanoflagellates are primitive microorganisms whose evolutionary roots can be traced to the era of the first multicellular animals (metazoans). In December 18 Proceedings of the National Academy of ...