Entelognathus primordialis
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Entelognathus primordialis, described in 2013, is a placoderm armored fish, which lived in the Silurian, 419 million[1] years ago. The complete fossil exhibits the earliest known structures comparable to the modern jaw and facial bones common to all the jawed vertebrates, or Gnathostomes, A team led by Min Zhu of the Academy of Sciences' Institute of Vertebrate Paleontology and Paleoanthropology in Beijing and an Austrilian discovered the intact, articulated fossil in rock formations at a reservoir in Yunnan Province.
The fish is older than the earliest known sharks and other bony fishes, which didn't have this property. The finding of this fish puts a new perspective on human history with respect to the origin of the human kind and properties of the bony jaw we might share with this extinct fish.