Pteranodon
"Pteranodon" was the first pterosaur found outside of Europe. Its fossils first were found by Othniel Charles Marsh in 1870, in the Late Cretaceous Smoky Hill Chalk deposits of western Kansas. These chalk beds were deposited at the bottom of what was once the Western Interior Seaway, a large shallow sea over what now is the midsection of the North American continent. These first specimens, YPM 1160 and YPM 1161, consisted of partial wing bones, as well as a tooth from the prehistoric fish "Xiphactinus", which Marsh mistakenly believed to belong to this new pterosaur (all known pterosaurs up to that point had teeth). In 1871, Marsh named the find ""Pterodactylus oweni"", assigning it to the well-known (but much smaller) European genus "Pterodactylus". Marsh also collected more wing bones of the large pterosaur in 1871. Realizing that the name he had chosen had already been used for Harry Seeley's European pterosaur species "Pterodactylus oweni" in 1864, Marsh re-named his giant North American pterosaur Pterodactylus occidentalis, meaning "Western wing finger," in his 1872 description of the new specimen. He also named two additional species, based on size differences: Pterodactylus ingens (the largest specimen so far), and Pterodactylus velox (the smallest).
Pelagornis
While "P. miocaenus" was the first pseudotooth bird species to be described scientifically, its congener "Pelagornis mauretanicus" was only named in 2008. It was a slightly distinct and markedly younger species. Its remains have been found in 2.5 Ma Gelasian (Late Pliocene/Early Pleistocene, MN17) deposits at Ahl al Oughlam (Morocco).
Additional fossils are placed in "Pelagornis", usually without assignment to species, mainly due to their large size and Miocene age. From the United States, such specimens have been found in the Middle Miocene Calvert Formation of Maryland and Virginia, and in the contemporary Pungo River Formation of the Lee Creek Mine in North Carolina (though at least one other pelagornithid is probably represented among this material too). USNM 244174 (a tarsometatarsus fragment) was found near Charleston, South Carolina and assigned to "P. miocaenus", and the slightly smaller left tarsometatarsal middle trochlea USNM 476044 might also belong here. A broken but fairly complete sternum probably of this genus, specimen LHNB (CCCP)-1, is known from the Serravallian-Tortonian boundary (Middle to Late Miocene) near Costa da Caparica in Portugal. Contemporary are certain specimens