Why are crocodiles not dinosaurs? Are crocodiles descendants of dinosaurs

I'm sure many people think that the earth was ruled by reptiles before the extinction of the dinosaurs, but in fact, such a statement can be said to be incorrect. To be precise, after the Carboniferous, two major groups of amniotic animals diverged, one of which was the conglocutary group (inferior pore), which included modern mammals and their ancestors, and the other was a group of sauriformes (saurophores) that included birds, dinosaurs, crocodiles, lizards, etc., and their ancestors, and for a long time, the one that evolved into modern reptiles, that is, the latter, was not dominant. All of the Permian, half of the Triassic, terrestrial vertebrates consist mainly of the ancestors of living mammals, the Zygosaurus, including the creeping but sail-like Coilosaurs, and the theropores more closely to mammals.

Especially before the greatest extinction of the Phanerozoic, the p-t extinction, the sauroids, that is, the ancestral group of reptiles, were not dominant. After the extinction of the p-t, most of the primitive Arches became extinct, but the orropoids survived and radiated to various parts of Pangea in the early Triassic. You may be familiar with the rest of the story, a meteorologist used their fossils to prove continental drift.

Before the mass extinction, some primitive groups of the main body presented in this article, the common ancestor of dinosaurs and crocodiles, had already appeared. And, it was very successful in surviving the P-T mass extinction (many of the basal sauriformes went extinct). However, by the Triassic, the top spot on land was not theirs.

However, a very small extinction in the geologic history period, which occurred around the middle of the Late Triassic, at the turn of the Carney to Noli periods, was probably a major moist event (wet, due to the dreadistine) that led to the decline of the entire Zygonida, the extinction of most of the Zygonus tetrapods, and the re-emptiness of the land. In fact, after the large-scale withdrawal of the arch group, some mosaic ankles that appeared earlier occupied most of the ecological niche on the landmass. And the bird beetle, which includes dinosaurs and pterosaurs, actually does not occupy much advantage.

The traditional view is that dinosaurs are the chosen ones early on, and they are determined to be leaders early on. <>

The ancestral group of living crocodiles, the ankles, was separated from the birds and dinosaurs, the two rising stars of reptiles, who overthrew the domination of their mammalian ancestors over land in the middle of the Triassic. However, after seizing land domination, the weaker bird beetles managed to start their own generation of more than 100 million years after the mass extinction. Crocodiles, now say that they are closer to dinosaurs, because most of the things that are closer to dinosaurs are extinct, but they are far less related to birds and dinosaurs.

Before the extinction of Carney-Noli, the main dragons were divided into two groups. One is called the bird beetle, which can be understood by listening to the name, with a bird-like type of beetle (which is a few bones on the feet), which is actually the later pterosaur, the ancestor of dinosaur birds; The other type is the mosaic ankle, the so-called mosaic ankle, which is a type of ankle bone with very inlaid characteristics. <>

It needs to be mentioned that the limbs of primitive quadrupeds are on both sides of the body, and supporting the body is a method similar to push-ups in support. The limbs are located under the torso to significantly improve the efficiency of movement, and there is also a very big advantage, standing does not require much effort. It should be noted here that similar structures in mammals evolved independently, and many tetrapod taxa have to move from the sides of the limbs to the bottom of the torso.

Between the Carney-Noli extinction event and the Triassic-Jurassic extinction event, there is also about the Noli period, and the Reti period is less than 30 million years. However, the extinction of the Triassic-Jurassic caused most of the most thriving group of the Triassic group to disappear. What's left?

The rest is the direct ancestor of the current crocodile, this type happens to be the one ambushed in the water, and the current crocodile, with small short legs, lies in the water. However, their ancestors were once a group of dinosaurs. <>

Crocodiles are not descendants of dinosaurs, they are carnivorous oviparous vertebrate reptiles, the oldest reptiles of the same age as dinosaurs more than 200 million years ago, and one of the most primitive animals living to date. Crocodiles survive and thrive because of their strong vitality, making them one of the oldest living fossils on Earth.

Crocodiles are endangered wildlife and are internationally listed as endangered wild animals and plants under Class I protection. China's special Chinese alligator is listed as a national first-class wild protected animal. In 2003, the State Forestry Administration approved three crocodiles, namely the Nile crocodile, the Gulf crocodile and the Siamese crocodile, to be included in the first batch of 54 species of wild animals that can be used commercially.

Crocodiles are not dinosaurs.

The crocodile is a vertebrate reptile that is the oldest reptile of the same age as the dinosaurs more than 200 million years ago, and it is also one of the most primitive animals living to date. Crocodiles survive and thrive because of their strong vitality, making them one of the oldest living fossils on Earth.

Crocodiles usually prefer to inhabit the wetlands of lakes and swamps or in the muddy areas of hills and mountain streams. Crocodiles often give the illusion of being sluggish. Others describe crocodiles as staggering, four-legged, floating, and dragging their tails on the ground instead of crawling forward close to the ground.

Belonging to two different species, the crocodile family champsosauridae is an ancient extinct reptile.

The skull of a crocodile is very similar to that of a lizard, but heavier. Lack of complex stool grinding square bones with subscaly classes. Due to the characteristics of the bibowed reptile biota, the location of Lombactera in the phylaxis is very unclear.

Distinguish from: Baryonychinae crocodile genus Suchomimus Ancient extinct spinosaur reptiles.

The morphology of the dorsal vertebrae of crocodile is similar to that of Diplosaurus, but very different from that of Spinosaurus. The dorsal vertebral nerve spines of Spinosaurus extended more upward. Crocodiles-like dragons have wishbones and are in the shape of a "V".

The shoulder blade has a deep, slightly triangular acromion process. The olecranon process of the ulna is unusually well developed, the length of the forelimbs is significantly shorter than that of the hind limbs, and the hands have well-developed finger claws.

Crocodiles did not evolve from dinosaurs, except that they share a common ancestor.

Crocodiles often live in rivers, lakes and other areas, they are separated from the dinosaurs' living area, we all know that the skin of the crocodile is very hard, this is its protective cover, and the bite force of the adult crocodile is very amazing, which makes the dinosaurs helpless against them, so at that time, the crocodile and the dinosaur have maintained a relatively friendly relationship, plus the crocodile survives for a long time, which makes the crocodile survive until now.

Crocodile has a very strong anti-hunger ability, compared to the violent predation of dinosaurs, crocodiles' predation methods are more sophisticated, after people's research on crocodiles, we found that crocodiles will first hide their bodies in the water when predating, slowly approach the prey, and then launch a surprise attack when they reach the vicinity, this way can reduce the physical consumption of crocodiles, and crocodiles can also survive for a long time without eating for a long time, which is also incomparable to dinosaurs.