In 1928 Charles Gilmore named a new species of Pteranodon: P. oregonensis. A humerus (holotype MPUC V.126713), two fused dorsal vertebrae and the broken-off end of some joint bone had been unearthed from the Lower Cretaceous (Albian) beds of the Hudspeth Formation in Wheeler County, in the state of Oregon, USA, to which the specific epithet refers. Gilmore noted similarities to Nyctosaurus though the specimens were larger.