. "Protopteraspis"@en . . . . "Protopteraspis is an extinct genus of agnathan known Lower Devonian marine strata in Western Europe. The animal's somewhat flat build has led some to believe that it was a bottom dweller, living in freshwater areas. It has been described as \"somewhat unspecialized\". Its snout was round and narrow, shorter than that of its immediate relatives."@en . . . . .