It was described by Xiang and Ji in 1986 , and the type species is Dayongia longicephala .
Dayongia is a genus of trilobites in the order Phacopida , that existed during the upper Ordovician in what is now China .
Dayongia was described by Xiang and Ji in 1986 , and the type species is genus longicephala .
Dayongia is a genus of trilobites in the order Phacopida , that existed during the upper Ordovician in what is now China .