Era & DiscoveryEdit
Archelon lived during the Late Cretaceous period, 85-65 million years ago in the seas of the Northern Hemisphere. Consequently, several skeletons of Archelon, lacking flippers, were found by various scientists. Most of Archelon skeletons are injured by Mosasaurs or other predators, like Xiphactinus. The first specimen of Archelon was collected from the Campanian-age Pierre Shaleof South Dakota by Dr. G.R. Wieland in 1895 and described by him the following year.
The largest turtle that has ever existed, Archelon was unlike any modern living turtle. With a 23-26 foot flipper span, reaching 14.7 feet (4.5 m) in length, and a weighing over 3 tons, Archelon was a monster of a reptile that could reach the size of a speedboat at adulthood with the sting proof beak, thickened skin mouth and razor-sharp beak was strong enough to cut through shell and bone. Archelon's flippers were powerful enough to propel it through the water for hours on end.
To minimize weight, Archelon's shell was not solid. It was instead made of a series of thin, parallel ribs, with leathery skin stretched across it. Despite its size, Archelon was relatively defenseless. Its head and flippers couldn't be withdrawn, so were vulnerable to predators like Tylosaurus.
Behavior & Traits Edit
Despite its size, it was no more aggressive than the modern sea turtles are, and actually lacked a hard bony shell, just as the modern leatherback turtle does. That made it vulnerable to attacks by such carnivores as Tylosaurus, Xiphactinus, as well as various Cretaceous sharks and an array of other marine killers would have come into contact with Archelon. It would have been a docile, peaceful wonder of nature, yet it in spite of being at least twice the size of even the greatest Leatherback and Loggerhead turtles, it was far from invulnerable. It is said to have lived in "the single most dangerous seas of all time - Hell's aquarium".
In its own turn, Archelon probably fed on jellyfish, squid, small fish, and other soft bodies creatures as well as ammonites, just as the modern sea turtles do. Since most of its food lived near the surface of the water, Archelon would rarely dive deep. It spent most of its life in the open sea and only ventured onto land to lay their eggs. Since shifting its body onto dry land was such a difficult task, they would lay their eggs at night to minimize the risk of being attacked by land predators such as dinosaurs.