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Adult male Pteranodon were among the largest pterosaurs, and were the largest flying animals known until the late 20th century, when the giant azhdarchid pterosaurs were discovered. The wingspan of an average adult male Pteranodon was 5.6 m (18 ft). Adult females were much smaller, averaging 3.8 m (12 ft) in wingspan. [18]
Size of P. sternbergi male (green) and female (orange) compared with a human. Pteranodon sternbergi was among the largest pterosaurs, with the wingspan of most adults ranging between 3 and 6 meters (9.8 and 19.7 ft). No complete skulls of adult males have been found, but a nearly complete lower jaw has been estimated at 1.25 meters (4.1 ft ...
Alexander Kellner, for example, named several additional species for specimens previously classified as Pteranodon, and placed P. sternbergi in a distinct genus, Geosternbergia. Kellner re-defined Pteranodontidae as the most recent common ancestor of Pteranodon longiceps , Geosternbergia sternbergi and Dawndraco kanzai , and all of its descendants.
The smallest known pterosaur is Nemicolopterus with a wingspan of about 25 cm (10 in). [1] The specimen found may be a juvenile or a subadult, however, and adults may have been larger.
In contrast, the more advanced, large pterodactyloid pterosaurs, such as Pteranodon, grew to adult size within the first year of life. Additionally, pterodactyloids had determinate growth, meaning that the animals reached a fixed maximum adult size and stopped growing. [206]
He found that female Pteranodon outnumbered male Pteranodon by 2:1. [115] Bennett argued that since large crests were only associated with one size morph, that it functioned purely as display. [117] He also hypothesized that Pteranodon sternbergi was the direct ancestor of Pteranodon longiceps. [117]
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In 2003, it was given a phylogenetic definition by David Unwin as the common ancestor of Pteranodon and Nyctosaurus plus all its descendants. Though Marsh had originally named this group based on the shared absence of teeth in those species, most analyses show that all of the traditional "ornithocheiroid" pterosaurs are also members of this clade.