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.
Pterygotidae
The Pterygotidae includes the largest known arthropods to have ever lived, with several species surpassing two metres in length (such as "Jaekelopterus rhenaniae" at 2.5 metres and "Acutiramus bohemicus" at 2.1 metres). There are several known factors that restrict the size arthropods are able to grow to. These factors include respiration, the energy it costs to moult, locomotion and the properties of the exoskeleton. Except the cheliceral claws, which are robust and heavily sclerotized, a majority of fossilized large pterygotid body segments are unmineralized and thin. Even the plates that form the surface of the abdominal segments, the stergites and sternites, are preserved as paper-thin compressions which suggests that pterygotids were very light-weight in construction. Similar adaptations have been observed in other prehistoric giant arthropods, such as "Arthropleura", and may be vital to the evolution of arthropod gigantism as a light-weight build decreases the influence of size-restricting factors.