others remain disputed. In 1815, the generic name Ptéro-Dactyle was latinized to Pterodactylus by Constantine Samuel Rafinesque. Unaware of Rafinesque's publication however, Cuvier himself in 1819 latinized the name Ptéro-Dactyle again to Pterodactylus, but the specific name he then gave, longirostris, has to give precedence to von Sömmerring's antiquus. In 1888, English naturalist Richard Lydekker designated Pterodactylus antiquus as the type species of Pterodactylus, and considered Ornithocephalus antiquus a synonym. He also designated specimen BSP AS.I.739 as the holotype of the genus. Description Pterodactylus is known from over 30 fossil specimens, and though most belong to juveniles, many preserve complete skeletons. Pterodactylus antiquus was a relatively small pterosaur, with an estimated adult wingspan of about , based on the only known adult specimen, which is represented by an isolated skull. Other "species" were once thought to have been smaller. However, these smaller specimens have been shown to represent juveniles of Pterodactylus, as well as its contemporary relatives including Ctenochasma, Germanodactylus, Aurorazhdarcho, Gnathosaurus, and hypothetically Aerodactylus if this genus is truly valid. The skulls of adult Pterodactylus were long and thin, with about 90 narrow and conical teeth. The teeth extended back from the tips of both jaws, and became smaller farther away from the jaw tips, this was unlike the ones seen in most relatives, where teeth were absent in the upper jaw tip, and were relatively uniform in size. The teeth of Pterodactylus also extended farther back into the jaw compared to close relatives, and some were present below the front of the nasoantorbital fenestra, which is the largest opening in the skull. Another autapomorphy that Pterodactylus has is that the skull and jaws were straight, which are unlike the upwardly curved jaws seen in the related ctenochasmatids. Pterodactylus, like related pterosaurs, had a crest on its skull composed mainly of soft tissues. In adult Pterodactylus, this crest extended between the back edge of the antorbital fenestra and the back of the skull. In at least one specimen, the crest had a short bony base, also seen in related pterosaurs like Germanodactylus. Solid crests have only been found on large, fully adult specimens of Pterodactylus, indicating that this was a display structure that became larger and more well developed as individuals reached maturity. In 2013, pterosaur researcher S. Christopher Bennett noted that other authors claimed that the soft tissue crest of Pterodactylus extended backward behind the skull; Bennett himself,