Hyperoartia is a group of jawless fishes that includes the modern lampreys and their fossil relatives, the jawless fishes of the class Anaspida. Example of hyperoartian from early in their fossil record are Endeiolepis and Euphanerops, fishes with hypocercal tails that lived during the Late Devonian Period. Some paleontologists still classify these forms among the jawless armored fishes. The only hyperoartians surviving today are lampreys, classified in the Petromyzontiformes. The discovery of… (More on Hyperoartia)