arharensis

combined with a hydrodynamic body

Although the skull is not fully known

as the distinction between ontogenetic variation and actual taxonomic differences in tyrannosaurids is complex

Boreopterus Troodon arharensisBoreopterus is a genus of pterodactyloid pterosaur from the Early Cretaceous (BarremianAptian, around 125 million years ago) , known from well preserved fossils in the Yixian Formation of Liaoning Province, northeast China. [turn0search1][turn0search2] It is classified within the family Boreopteridae , a lineage closely related to ornithocheirids, characterized by cranial and dental adaptations that suggest a piscivorous lifestyle . The skull of