Speculating on the process of turtle fossil formation essay 20 words?

The turtle fossil is supposed to be excavated in a group of studios thousands of years ago, not long ago on the beach.

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Over the past decade, archaeologists have discovered two fossilized prehistoric turtles that have partially evolved their carapace but have not yet developed toothless beaks like modern turtles. Recently, archaeologists have discovered another fossil of an ancient turtle with a beak but no armor. This discovery has refreshed scientists' understanding of the evolution of turtles.

This 100-million-year-old "Chinese protocarpus" (eorhynchochelys sinensis) is more than 2 meters long and probably lives near the shore and feeds in the shallows. A team led by Li Chun, a researcher at the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences, discovered the fossilized skeleton of this ancient turtle in Guizhou.

Although the shape of this prehistoric long-tailed turtle is similar to that of modern turtles, its spine and ribs have not yet healed to form a carapace. What's more, the front of the turtle's mouth has a beak, but the back of the upper and lower jaws still retains teeth.

According to a new international study, the Chinese protobeak turtle evolved its beak before other ancient turtles, but did not develop dorsal or ventral carapaces like theirs, reflecting the characteristics of mosaic evolution. Fundamentally, this fact suggests that the various ancestral species of a modern animal evolved different characteristics at different times, and that these characteristics were all ultimately expressed in the same animal.

This astonishing fossil is an exciting discovery that provides us with another clue to the mystery of turtle evolution. The author of the above-mentioned report.

1. Nick Fraser of the National Museum of Scotland said, "This shows that the evolution of the ancient turtle did not depend on the gradual accumulation of those iconic features, but through a series of more complex events." Our findings are just the beginning. ”

In addition, the skull features of this ancient turtle indicate that it belongs to the biforale reptile species, which belongs to the same phylum as today's lizards and snakes. Prior to this, scientists had speculated that prehistoric turtles originated from the family of porous species.

Based on the biforareal skull of the Chinese archaeopteral turtle, we know that the turtle did not originate from ancient non-porous reptiles, but from more thoroughly evolved biforated reptiles. The author of the report.

1. Olivier Rieppel of the Field Museum of Natural History in Chicago said, "It's a nail in the coffin, and the argument is over." ”

As for the meaning of the word eorhynchochelys, in Latin it means "the beginning of the beaked turtle", that is, the first turtle with a beak; Sinensis, on the other hand, is "from China".

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The tortoise's body was blocked from the air, and after hundreds of millions of years of transformation, under the action of high temperature and high pressure, the sediment shrouded on the body became thicker and thicker, until the sediment above and below the tortoise's body became hard sedimentary rock. The remains of the turtle sandwiched in these sedimentary rocks have also been transformed into turtle fossils, which are very hard objects like stones.

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I have a little turtle at home, and the little turtle sleeps in the tank all day long, carrying a heavy shell on his back every day. His shell can be beautiful, square by square, each with a different green, light and dark .......

The little turtle's head is even cuter, a green, small head like a grain of rice; A little eye, black, as if it had been dotted with ink; The tiny calves get up, and the tail and shell flutter, which is fun.

Every time I put the pork in front of its head, it first thought it was something dangerous and retracted its head into its shell. After a while, noticing that there was no movement, it slowly stuck its head out and touched the piece of meat with its hand. After observing for a while, when he saw that he was fine, he put his mouth over and ate.

It takes a bite first, and then slowly puts the whole piece of meat into its mouth and bites.

Sometimes, it's probably stuffy, and it just flips its head in the tank. One dozen, with all fours in the air. Haha, the little turtle used all his strength to turn its body over!

Once, when I put a branch on its head, the little turtle immediately shrank its head, hands and feet into its shell and turned into a stone. I struck his shell with a twig, and the little turtle immediately stretched out its feet and ran away, and crawled into a house, as if nothing else was allowed to touch its beautiful shell.

This little turtle is my favorite baby.

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The turtle is a grass turtle, and its species was formed very late, and there is no possibility of fossil formation. If it is a turtle of other ancient species of the reptilian turtle order, it is possible that there are fossils, but the turtle does not.

In layman's terms, a fossil is a stone that turns the remains or remains of living beings living in the distant past.

In the long geological time, there have been countless creatures living on the earth, and many of the dead bodies of these creatures or the traces left by life have been buried by the sediment of the time.

In the years that followed, the organic matter in the remains of these organisms was decomposed, and the hard parts such as the shells, bones, branches and leaves, along with the surrounding sediment, were petrified and turned into stone, but their original form, structure (and even some subtle internal structures) remained; Oh ( -

In the same way, the traces left by those creatures when they lived can be preserved in this way. We refer to these petrified biological remains and relics collectively as fossils. Through the study of fossils, scientists can gradually understand the morphology, structure, and types of organisms in the distant past, and can infer the process of the origin, evolution, and development of organisms over hundreds of millions of years.

It can also restore the ecological environment of the earth at all stages of the long geological history.

I have a turtle at home, and I have been raising it for seven or eight years, and when I talk about it, I am really proud of it!

The turtle is earthy yellow because it has a thick red stripe on each side of its head, and Dad said it was called the "Brazilian Red-eared Turtle" because of the thick red stripe on each side of its head. It has a pair of small eyes on its head, like two black pearls. Under the eyes, there are two nostrils the size of sesame seeds, and a barbed mouth.

It has a large shell on its back with uneven stripes. The most special thing is that every year the turtle grows old, it sheds a layer of shell, and the stripes on its back will be one more circle. There are also four short feet next to it.

As soon as I touched it, he would retract his head, hands, feet, and tail, and he was really a "turtle with a shrunken head".

The turtle is a veritable "big rice bucket". Whenever I put fresh shrimp in front of it, it always pounces, bites into the shrimp meat, and enjoys it greedily. It is very intelligent, and eats shrimp and carefully peels its own shell.

Once, I deliberately teased it by holding the shrimp above his head, and the turtle stared at the shrimp intently. Looking at its pitiful appearance, it really makes people laugh and cry.

Don't look at him so well-behaved now, it's really scary to be fierce! I remember that one winter, the turtle hibernated. Dad was afraid that it would starve to death, so he woke it up.

I saw the turtle glaring at my father viciously, and suddenly, it pounced. After a miserable scream, the turtle had already bitten his father's thumb tightly, and he couldn't pull it out, and he couldn't shake it off, and his father broke out in a cold sweat in pain. When the turtle's mouth was pried open with a vice, Dad's thumb had become red and swollen.

This is my smart, witty, and a little mischievous best friend, the turtle.