The evolution of creatures from prehistoric times to the present day has always surprised people. These powerful creatures, with their large size gradually rise to the top of the food chain. Underwater creatures are also not out of this rule. In fact, through scientific studies and fossil samples, it has been discovered that many species of sea monsters have participated in the competition to dominate the ocean in the past.
Leedsichthys is the largest fish ever recorded. Archaeological studies indicate that they were once scattered over the oceans around 165 between the Jurassic period.
The first specimen of the Leedsichthys was found in 1880, so far there have been many more discrete samples belonging to more than 70 individuals. Since the bodies of Leedsichthys are easily biodegradable over time, it is difficult to determine their true shape and size. However, one of the specimens called ‘Big Meg’ was agreed to be about 16.5m in size.
The weight of Leedsichthys is also a question mark. But one can speculate from the size of the sperm whale. With a male sperm whale of similar length, the weight can be up to 40 tons. Even in the case of Leedsichthys’s slender and slender body structure, the weight is still impressive.
Based on the specimens collected for the Mosasaurus Hoffmanni, it is estimated that they can be 17 to 18 meters long, weigh about 15-20 tons and its skull is only nearly 2 meters long.
Mosasaurus Hoffmanni are gigantic in size, and they also have the perfect body structure of an underwater hunting species. The skull structure of Mosasaurus Hoffmanni is quite similar to modern worms, long jaws, thick jaw bones, capable of producing jabs with a bite force of 1/3 of body weight. It is estimated that the bite force of Mosasaurus Hoffmanni can fracture the leg or crush the skull of an adult T-Rex.
Their rare representatives of oversized sea monsters still exist today. Although they are called ‘fish’ they are actually more mammalian in nature. The sperm whale is very respectable in size, over 18m long and weighs about 57 tons. To feed such a massive body, they consume a huge amount of squid and fish every day, sometimes even sharks and giant squid.
Although almost invincible in nature, the sperm whale is hunted by humans for its multipurpose fat. In the eighteenth century, to get raw materials for soap, candles, ambergris … sperm whales were hunted massively. The fact that the sperm whale sank the Essex whaling ship in 1820 became the inspiration for the novel Moby Dick.
Mosasaurus Hoffmanni is only one of the largest marine reptiles, while Shastasaurus Sikanniensis is the largest marine reptile.
In 2004, a number of fossil samples from this species were found, estimated to be 21 meters in size and lived about 210 million years ago. The body weight is estimated at 62-68 tons. However, this Shastasauru Sikanniesis has a short skull and toothless jaw, it is thought that their prey is probably molluscs, less ferocious than the Mosasaurus Hoffmanni.