Pteranodon
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaur that included some of the largest known flying reptiles, with wingspans over 8 meters (26 feet). They lived during the late Cretaceous geological period of North America in present-day Kansas, Alabama, Nebraska, Wyoming, and South Dakota. More fossil specimens of "Pteranodon" have been found than any other pterosaur, with about 1,200 specimens known to science, many of them well preserved with nearly complete skulls and articulated skeletons. It was an important part of the animal community in the Western Interior Seaway.
Thalassodromeus
The holotype (and only known skull) of "Thalassodromeus sethi" is one of the largest pterosaur skulls ever discovered. The entire skull is estimated to have been long; the bones were fused together, indicating adulthood. Based on related pterosaurs, its wing-span was , making "Thalassodromeus" the largest known member of its clade, Thalassodromidae. Of similar proportions, its skull was more heavily built than that of its relative "Tupuxuara". Although the postcranial skeleton of "Thalassodromeus" is unknown, relatives had unusually short and blocky neck vertebrae, with well-developed front and hind-limbs that were almost equal in length (excluding the long wing-finger). The hindlimbs were 80 percent that of the forelimb length, a unique ratio among pterodactyloids (short-tailed pterosaurs). As a pterosaur (extinct order of flying reptiles), "Thalassodromeus" was covered with hair-like pycnofibres and had extensive wing membranes (which were extended by the wing finger).