Sleeping history ...
This world is 454.3 million years old. We Homo sapiens originated where only 4 to 2.5 million years ago. It is not even a blink of an eye on the scale of the great age. How many monsters have shaken the earth and ruled the earth for billions of years before this. And left behind is the thrilling history of hundreds of millions of years lying dormant on the earth. Much of that history is forgotten today in the cataclysm of time. Yet, from time to time, some bubbles burst from the sheets of time, and we tried to rescue them by arranging them like jigsaw puzzles. What we know is no less than the use of our invented technology and the maximum use of the brain.
So dinosaurs are a huge part of this history. Today I am starting the journey of the ancient world from the Silurian period. Tell the story of how strange dinosaurs, especially sauropods, appeared over billions of years from marine fish. Stop at the end of the Cretaceous era. Their contribution to bringing diversity to the world and behind our existence is undeniable. So today I will personally respect them and talk, I hope no one will mind. So let's shed some light on the scope of our acquired knowledge ...
Approximately 44.34 crore years ago to 41.92 crore years ago. The Silurian period is going on in the world then. The average temperature is 3 ° C higher than now.
The ancient continent of Gondwana covered most of the equator and the southern hemisphere. And across the northern hemisphere was a huge ocean called the Panthalasic. Osteoarthritis fish are roaming in that sea, jawless, jawless and bony fish peeking out from their descendants. This is the first time that tetrapods have evolved from bony fish. Tetrapods are four-legged animals that have better spines than fish. This is the first time that algae and moss have spread to other parts of the world. Arthropods have also started to come up.
Some tetrapods called Reptiliomora first started laying eggs in the Mississippian period 320 million years ago. This is the first egg of the ancient world. Egg yolks contain fetal food. This is a kind of fluid that surrounds the yolk and the fetus. Whose name is Amnion. The eggs of animals that contain ammonia are called amniota. At this time the amniotic laying animals were divided into two half-brothers. These two stepbrothers are-
1. Synapseida
2. Sorapsida
Synapseida:
The species Synapsida originates from amniotic laying animals. All mammals are honorary members of this episode. For this reason they are also called Theropsida.
Sorapsida:
Primitive reptiles originated from Sorapsida during the Pennsylvanian period 312 million years ago. Eureptilia reptiles differ from primitive reptiles. It was then that the Romerida masses spread from Eureptilia, evolving as leaders of reptiles.
Among them, animals with a temporal hole in the skull are called diapsida. The genus Diapsida of the reptile class appeared in new forms. Evolved new dypsida masses are called neodyapsida. They appeared in the Permian period 269 million years ago. All kinds of lizards, crocodiles, birds and other animals came from this neodyapsida.
In the evolution of the Neodiapsida genus, animals called sorias came into the Permian period 265.6 million years ago. The evolution of reptiles later led to the emergence of various species. According to this formula, the Sorias are divided into different sects.
One of these divisions is Arcosorumorpha. These reptiles appeared in the Permian period 265.1 million years ago. Then came the greatest extinction in the history of the world. 252 million years ago today. Exactly what happened cannot be confirmed. However, the idea is that this destruction is the sum of some pieces of events. Towards the end of the Permian period, volcanoes begin to emit much more carbon dioxide. Some methagenic bacteria release methane gas into the air. As a result, the temperature rises a lot. Bubbles of hydrogen-sulfide rise from the sea. Acid rain begins. Meanwhile, a huge eruption began in Siberia. As a result, in just 60,000 years, about 98% of living things die in the throes of death. Somehow only the archos survived. Below are fourteen of them-
Arcosoria:
They originated in the Triassic period 250 million years ago.
Avemetatarsalia,
Dinosaur morph
And dinosaur morphs:
They also originated in the Triassic period 245 million years ago.
Dinosauria: They originated 231.4 million years ago and the Srishtians spread as their leader during that well-known Triassic period.
About 200 million years ago today, 50 million years after the Permian catastrophe, the earth became hostile again. Triassic-Jurassic destruction begins. There are differences of opinion as to the exact cause of this catastrophe, but some believe that some of the massive asteroid fragments that came out of nowhere were the cause of the devastation. About 80% of the animals died this time. The rest of the Arkosas brothers left the world. Survive only crocodiles, giant pterosaurs and dinosaurs that live on land as heirs of archos. Their reign began on earth. Long-necked dinosaurs are called saropads. And short-necked dinosaurs are called theropods. There were many more species of dinosaurs besides theropod saropods.
The genus Dinosaur has been divided into two groups according to the structure of the pelvis. The thing is, what is this pelvis?
In the living world, the hip structure of two-legged or four-legged creatures is made up of three bones. This is the pelvis. It has a hole in the center. This is where the femoral head is attached and the hip joint is formed. So, while collecting fossils, scientists found samples of some pelvis that resembled reptiles, but they were not exactly like reptiles. Again, these are not like mammals or birds.
Scientists initially collected samples of this species that looked like the buttocks of a giant monster. Again, they were shaped like lizards. That is why they are named dinosaurs. The Greek “deinos” means horrible, terribly huge. And “sauros” means lizards or reptiles. The combination of these two words was first coined by the English biologist Sir Richard Owen in 1842. The Bengali word dinosaur is a phonetic form of the English word dinosaur.
Scientists examined samples of the pelvis of the genus Dinosaurus and found that the pelvis of some species resembled a bird. The pelvis of some species resembles that of ancient lizards. In this trial, scientists determined two classes. In 1967, the scientist Silly made this division and named it - 1. Orinitheskia.
2. Surprise.
All dinosaurs originated from these two classes. And a subgroup of these Sarischiyas is His Majesty Saropad
Beautiful of nature sleeping beauty