Pteranodon
While the first "Pteranodon" wing bones were collected by Marsh and Cope in the early 1870s, the first "Pteranodon" skull was found on May 2, 1876, along the Smoky Hill River in Wallace County (now Logan County), Kansas, USA, by Samuel Wendell Williston, a fossil collector working for Marsh. A second, smaller skull soon was discovered as well. These skulls showed that the North American pterosaurs were different from any European species, in that they lacked teeth and had bony crests on their skulls. Marsh recognized this major difference, describing the specimens as "distinguished from all previously known genera of the order Pterosauria by the entire absence of teeth." Marsh recognized that this characteristic warranted a new genus, and he coined the name "Pteranodon" ("wing without tooth") in 1876. Marsh reclassified all the previously named North American species from "Pterodactylus" to "Pteranodon". He considered the smaller skull to belong to "Pteranodon occidentalis", based on its size. Marsh classified the larger skull, YPM 1117, in the new species "Pteranodon longiceps", which he thought to be a medium-sized species in between the small "P. occidentalis" and the large "P. ingens". Marsh also named several additional species: Pteranodon comptus and "Pteranodon nanus" were named for fragmentary skeletons of small individuals, while "Pteranodon gracilis" was based on a wing bone that he mistook for a pelvic bone. He soon realized his mistake, and re-classified that specimen again into a separate genus, which he named "Nyctosaurus". "P, nanus" was also later recognized as a "Nyctosaurus" specimen.
Glyptodon
Although Darwin is said to have found the first fossils of glyptodontines (the subfamily), the first mention of the genus "Glyptodon" in Europe was in 1823, from the first edition of Cuvier's "Ossemens Fossiles". The then unnamed "Glyptodon" was briefly mentioned in a letter from Dámaso Antonio Larrañaga. He had found "a femur... It was about seven pounds, and maybe six or eight inches wide", as well as part of a tail. At the time, the discovery was believed to have belonged to "Megatherium", a type of giant ground sloth. A man named Sellow found some carapace plates in three-foot deep clay in Uruguay four years later. That discovery only made the professors even more certain that the discoveries were of "Megatherium", since the bones of this prehistoric giant sloth were usually found in similar conditions and Cuvier had said that the genus was loricated.