Deng's fish is a genus of fish in the family Scaridae, also known as the shell fish. It is the largest known shield skin fish, with a body length of up to 11 meters. The body shape is spindle shaped, similar to that of a shark; The head and neck are covered with thick and hard shells; The skin on the back is dark in color; The abdomen is silver in color. Living in Devonian ancient organisms, inhabiting shallower waters. Being able to prey on any creature in the ocean at that time, he was likely the first king of beasts on Earth, more than 100 million years before the birth of the first dinosaur on land. The largest predator in the Devonian ocean and the largest carnivorous fish that has ever appeared on Earth is known as the Tyrannosaurus rex in the ocean.

The fish salamander is one of the oldest known terrestrial vertebrates and also the earliest known amphibian. According to the discovered fossils, they lived approximately 360 million years ago. Compared with the spiny salamander, the limb joints of the fish salamander are very flexible, and the ribs are wide, which is conducive to supporting its body to walk on land. Its spine has also grown joint processes, which can allow the spine to bend and move.