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.
Elizabeth Philpot
The Philpot sisters' extensive and meticulously labelled fossil collection was used for research by many geologists. All three sisters contributed to the collection, but it was Elizabeth Philpot who corresponded with leading geologists like William Buckland, William Conybeare, and Henry De la Beche about the collection. The collection was well known for its fossil fish. It also contained the fossil teeth that William Buckland combined with a famous partial skeleton discovered by Mary Anning when he described the pterosaur "Pterodactylus macronyx" (later renamed by Richard Owen to "Dimorphodon macronyx"), in 1829. In his famous 1824 paper that described the almost complete plesiosaur skeleton discovered by Anning in 1823 Conybeare mentioned examining a plesiosaur skull in the possession of "Miss Philpot".