The smooth-sided odontosaurus was the strongest and largest aquatic beast in history. In the late Jurassic, their huge figures, driven by four giant paddles, cut through the shallow water majestically, venting invisible hegemonic momentum! The long chin of the smooth-toothed dragon was covered with sharp teeth. In the face of such a devouring machine, crocodiles, Leeds fish, ichthyosaurs and even other pliosaurs have to stay at a respectful distance from each other, otherwise born to die. The nasal cavity structure of plesiosaur makes it smell in water, so plesiosaur can find the whereabouts of its prey far away. Synodon spends all his life in water except breathing on the water, so they are oviparous animals and like to give birth in shallow water. Until recently, the largest adult plesiosaur that scientists could determine was only18m, but in 2003, a pliosaur fossil of18m was unearthed in Mexico, and it was only a cub! If it grows successfully, it will be very shocking.

Time:1.65 ~ 65438+50 million years ago

Earth, 1.49 million years ago. When violent geological movements slowly tore apart the ancient Pangaea, the steadily rising sea level shaped the Jurassic coastline. Thousands of square kilometers of low-lying areas were submerged by seawater, forming a large shallow water area called "land surface sea" by geologists. These sunny waters have become another stage for biological evolution.

With the potential food sources becoming more abundant, many terrestrial animals began to gradually adapt to aquatic life. Reptiles, after becoming the rulers of the land and the sky, completed the takeover of the Mesozoic ocean at this time, acting as the ultimate killer in this environment and being called the "ultimate consumer" in ecology.

These sea hunters are not directly related to dinosaurs, but they are also huge monsters. Although they float to the surface to breathe air in a single way, their bodies have changed in various ways: ichthyosaurs, which are streamlined like fish, can dive deeper into the sea to chase squid; Crocodiles adapted to the salt water environment don't mind the hard shell of ammonites; Long-necked pterosaurs watched the fish that were about to swim out of the shadow. Among these sea hunters, Shanglong is the largest, such as the 25-meter-long smooth-toothed dragon, which is the largest carnivore in that era and even in history. The giant mouth of the smooth-toothed dragon is 3 meters long, and it seems to be specially designed to tear up its unlucky prey. The residents of these waters can completely scare the dinosaurs on the shore.

As if it were a terrible echo from the past, the complete skeleton fossil of this smooth-sided odontosaurus clearly shows the skeletal characteristics of Shanglong: notice the wide disk-shaped bones in its abdomen, which reinforced its trunk.

A fully mature male smooth-toothed dragon quietly watched what was happening underwater. It can be seen from the posture of its limbs that the largest marine reptile in history is ready to attack. This monster is 25 meters long and weighs 150 tons. Each fin foot is 3 meters long. Dagger-like teeth emerge from the end of its huge mouth and can easily pierce the skin of any prey. The smooth-sided odontosaurus had a keen sense of smell and was good at tracking prey in seawater with its nose. In fact, this smooth-sided odontosaurus was attracted by a small fish dragon born 150 km away.

The smooth-sided odontosaurus slowly raised its broad head and gently pressed the flippers down. The behemoth began to move forward, the water washed the ammonites back and forth, and the fish hurriedly hid in the coral reef. In a flash, the killer opened his mouth and grabbed the unguarded big-eyed ichthyosaur. The huge attack force made his head jump out of the water with his prey, and then slammed into the sea. In this sudden bleeding, his prey died immediately. Almost in the blink of an eye, the body of the big-eyed ichthyosaur has been broken into two pieces from the back, and the small fish dragon in the body has also been pierced by the teeth of the smooth-toothed dragon. The hunter who succeeded in the sneak attack was satisfied. He shook his head, adjusted the position of his prey in his mouth and quickly bit the body of the big-eyed ichthyosaur. Finally, the female ichthyosaur's body was torn into three pieces, and the smooth tooth dragon bit the front piece and floated into the sea. As soon as it looked up, this big piece of meat fell into its mouth and was swallowed by him. He breathed a sigh of relief, went back to the bottom of the sea again, picked up the second ichthyosaur body, and then floated to the sea surface of Shanghai ... At the same time, the beautiful crescent tail of the big-eyed ichthyosaur skimmed the coral reef and slowly slid to the bottom of the sea at a depth of 100 meters.