1: Spiny tooth shark
The largest marine organism of the Permian period was the spiny tooth shark, which has two major categories, one of which appeared in the Late Carboniferous Period and can reach a maximum of 6 meters. The largest class of sharks with teeth ranging from 19 to 37 cm long , is estimated to be up to 10 to 20 meters long , belonging to the maritime overlords of the time , comparable to ichthyosaurs 220 million years ago.
2: Sword shoots fish
The sword-shooting fish has a dark blue back and a silvery belly, which serves as a camouflage color for it above and below. The combination of sharply bladed teeth and a powerful tail makes it a powerful chasing hunter. Sword-shooting fish cruise under the waters of the ocean. It preys on other large fish, including large fish that are 2 meters long, and prepares to pounce on seabirds on the surface of the water, such as a floating dusk bird.
Most importantly, however, sword-shooters were a great swimmer who could reach or exceed anything in the ocean at the time. It may be able to jump out of the water while helping itself to get rid of parasites from its skin. However, it is not invincible. Once injured, its sheer size means it's easy to spot and fall prey to sharks and dragons. Sword-shooting fish are predatory fish, with at least 12 species of prey found in their stomachs.
George F. Sternberg once found a 4-meter-long specimen of a sword-shooting fish, and a 1.8-meter-long gill glandular fish remained in its stomach. The sword-shooting fish appears to have died shortly after swallowing its prey, possibly due to the destruction of its organs while the prey struggled. Injured swordfish or their carcasses would have been food for Cretaceous sharks such as the Cretaceous beetle shark and the horned squalid shark.
The remains of a sword-shooting fish were found inside the body of a chalky spiny beetle shark. There are no data on the juvenile stage of sword-shooting fish. The smallest fossils of the sword-shooting fish consisted of a tooth and jaw, and the individual was estimated to be 30 cm long. The sword-shooting fish and other beggar fish became extinct at the end of the Upper Cretaceous period, when the western inland sea lanes receded. Parts of the skull of what may be a brand new species of sword-shooting fish have been found in the Czech Republic.
3) Steel Shredder - Dunn's Fish
The Dunn's fish is a representative member of the dinosaur family and the largest member of the known shield fish family, and was an absolute hegemon of the Devonian oceans that lived in the Devonian period about 360 million to 415 million years ago. It was up to 9 meters long, had the largest bite force and amazing suction force of any creature known to exist on Earth, and was at the top of the ocean's food chain at the time.
It could bite sharks in half in one bite and could prey on any kind of creature in the Devonian ocean. However, the huge body and size greatly affected the speed and sensitivity of the Dunn's fish, which made it gradually lose to small sharks and other carnivorous fish in the process of evolution; coupled with the changes in the earth's environment, it eventually gradually left the stage of biological reproduction and evolution.
4: Land-sea dictator - Heath's root-toothed fish/lungfish
They lived in the Sea of the Carboniferous Period, with a body length of 5 meters and a weight of 2 tons, which was the giant of the ocean at that time, and the primitive sharks of the same era, such as the pectoral fin shark, were just a piece of cake for it, because the animals at that time in addition to it, the largest was a 4-meter filter shark, and the thoraco-spinal shark would be torn apart when it encountered him. Lungfish have well-developed fins and strong muscles, so lungfish can climb up inshore to prey on land and amphibians.
5: Boss Appearance: The most biting force - megalodon
Megalodon sharks, like other modern sharks, have cartilage rather than bone bones, but there is little record of fossilized bones. Megalodons have a mouth diameter of up to two meters and a strong, streamlined body that allows megalodons to easily prey on any creature in the sea. Megalodon's teeth are similar to those of great white sharks and are about 7 inches long (maximum inclined length). Related studies have pointed out that it is a close relative of the great white shark, but some scientists believe that the similarity of teeth is due to convergent evolution.
It is speculated that the largest megalodon shark is 17 meters long and can eat a Tyrannosaurus rex. Judging from this shape, the megalodon shark can weigh up to 60 tons. Assuming that the great white shark's metabolism is used as a proportion, it needs to consume an average of fifty-one-tenths of its body weight (that is, 2400 pounds) of food per day. From the prehistoric food chain, it is generally believed to feed on cetaceans, but also preyed on other marine mammals. The species is habit of adult megalodons hunting in open oceans, while juveniles live in waters closer to the coast.
Megalodons attack animals that breathe on the surface of the sea. Megalodon sharks can swim quickly over short distances and attack from under their prey. When hunting large prey, megalodon sharks may attack their tail or fins first, rendering them incapacitated before eating them.