Diplodocus (meaning “double beam”) is a genus of diplodocoidea sauropoda dinosaurs, the very first fossil of which was discovered in 1877 by Samuel Wendell Williston. The gender name was coined by Othniel Charles Marsh in 1878 on the basis of the animal's characteristic bones, which were initially thought to be unique, but were later found in other members of the Diplodocidae family and other sauropods such as Mamenchisaurus.
Diplodocus lived in western North America in the late Jurassic period. Its remains are among the more common dinosaur fossils in the upper part of the Morrison Formation, which consists of shallow marine and floodplain (alluvial) sediments deposited during the Kimmeridge – Tithon eras about 147–150 million years ago. The Morrison Formation has preserved traces of an environment and period dominated by giant sauropod dinosaurs like Camarasaurus, Barosaurus, Apatosaurus, and Brachiosaurus. Diplodocus, a classic dinosaur in shape, has a long neck and tail, and strong legs dinosaurs. It was the longest known dinosaur for years. Its large size may have deterred predators such as Allosaurus and Ceratosaurus, the remains of which were found in the same strata, indicating that they coexisted with Diplodocus. He could even use his long tail against large predators, one blow of which could even cause the death of the attacker. This is why it is also called an old whip tail.
Diplodocus is one of the best known sauropods, a very large, long-necked, four-legged animal with a whip-like tail. His front legs were slightly shorter than his hind legs, so his body was roughly horizontal. Its long-necked and tailed skeleton, with four strong legs, is mechanically reminiscent of a suspension bridge. Diplodocus is the longest dinosaur known by its entire skeleton. Partial remnants of D. hallorum increased its estimated length, but not to the extent previously expected; at the time of its first description, in 1991, the explorer David Gillette determined that it was 52 meters long, making it not the longest known dinosaur (not counting those known by particularly few remains, such as Amphicoelias). A weight estimate assumed a weight of 113 (or rather only 50) tons. This review was based on recent discoveries that showed that the giant tail vertebrae were actually located forward on the tail than Gillette had originally thought. The study showed that the entire 13th tail vertebra of the Diplodocus skeleton used to estimate the mass of Seismosaurus at the Carnegie Museum of Natural History in Pittsburgh came from another dinosaur, so the mass of Seismosaurus was overestimated by 30%. Although dinosaurs such as Supersaurus were probably longer, the fossil remains of these animals are only fragmentary.
Diplodocus's skull was very small compared to the animal's 32- to 33.5-meter body and associated 6-meter neck, and its skull was also small. His small, pile-like teeth stood forward and were located only in the front of the jawbones. The neck consisted of at least fifteen vertebrae and is now believed to be parallel to the ground and could not be raised much higher than the horizontal position. Modern weight estimates (excluding D. hallorum) suggest body weights between 10 and 16 tons, such as 10, 11.5, 12.7, and 16 tons, respectively. Diplodocus's tail was extremely long, consisting of about 80 vertebrae, roughly twice its , which is known from earlier sauropods (e.g.