Dinosaurs were once the masters of the earth, its sudden disappearance has been the subject of debate in the scientific community, there are no less than twenty reasons for the disappearance of dinosaurs, the most mainstream theory is that planetary impacts and volcanic eruptions say that 65 million years ago a short period of time destroyed seventy percent of the life on earth, but some of the oceans survived, the following is a list of fish that appeared in distant prehistoric periods.
Sawfish, an endangered animal that lived in the Cretaceous era, had long kissing saws, covered with teeth, and would use the saws to attack small fish, or use them to excavate underlying organisms.
Lamprey, according to the fossils that have been found, the three-phase life history of modern lamprey eels has been formed as early as 125 million years ago and has been maintained to this day, lamprey eel has only one nostril, the eyes are developed, its eyes are behind the body each have 7 gill holes, this is why it is called "lamprey eel", no jaw, it is full of sharp teeth, which is one of the characteristics of ancient fish ancestors
Arowana, which existed as early as the ancient Carboniferous period, has a lifespan of up to several decades. Fierce in temperament. Developed as an ornamental fish since the mid-20th century, it has attracted attention for its shimmering metallic, armor-like scales, bright light colors, and majestic manners
The long-snouted sail lizard, which has a distinctly prehistoric appearance, is fierce in appearance, sharp in teeth, has sails on its tail, and its appearance is reminiscent of some dinosaurs. The body is slender, with a long and high dorsal fin, and a large mouth with fangs. It is a voracious carnivorous fish that feeds on a variety of fish and invertebrates
Named for its jagged gill cleavage on its head, the jagged shark, despite its appearance, has 300 sharp teeth, more than 25 rows, and is a fierce sea predator that has been alive on Earth for 80 million years
Sturgeon is one of the earliest vertebrates of extant origin, and sturgeon first appeared in the Early Triassic Period, 230 million years ago
Crocodile eels have lived on Earth for more than 100 million years. Its name comes from the shape of the snout, and its whole body is covered with super-hard fish scales, and the largest can reach 3 meters. The crocodile eel resembles a reptile in appearance, with a long beak and double rows of sharp teeth, which is extremely fierce
Senegalese polyfinfish lived in the Cretaceous period and were aggressive in nature, with slender bodies, generally growing up to 40 cm. This fish has multiple layers of scales, and its special four-layer cross structure and composition make it resistant to huge impacts
The echinospid is the oldest animal to survive to date, and the fossil record dates back 410 million years, and it is thought that they became extinct during the Cretaceous period until 1938, when a living coelacanth was discovered in South Africa
Arapaima is speculated to have appeared as early as 100 million years ago, the arapaima is huge, the adult length can exceed 2.5 meters, the longest is 3 meters, the weight is up to 200 kilograms, the arapaima parade is very slow, relying on the predation of small fish for a living, the arapaima needs to float to the surface from time to time to swallow the air to breathe to survive