What is called a living fossil , I know that there is a living fossil and .

Some of the ancient species of living organisms that exist. It is a non-scientific term. Darwin first used Ginkgo biloba, which was thought to be extinct more than 100 million years ago in East Asia. It is generally accepted that there are four qualifications for living fossils:

Anatomically very similar to an ancient species, but not necessarily identical or that species.

This ancient species is at least 100 million or tens of millions of years old, and has retained many of its original features throughout its geological history without major changes, and is a slow-evolving organism.

The living members of this group are represented by one or a few species.

They have an extremely limited range.

According to research, the growth rate of slow-evolving organisms is low, and they are very adaptable to fluctuations in the physical and chemical conditions of food and habitat. The new species associated with them may not be competitive in the same environment. Seeding is an important part of biological evolution.

With a very low rate of habitat formation, these organisms will not change for millions of years. As a result, some ancient creatures that have lasted for tens of millions of years have been formed, and other creatures of the same era have long been extinct, and only they have survived alone, living in a very small area, called "living fossils".

According to the type analysis of biological evolution, "living fossils" are lines in phylogeny that have not undergone advance evolution for a long time, nor have branching evolutions. In addition, there is no interruption of the lineage (extinction), but the result of a state of stagnant evolution. and must remain a living species.

In 1938, the first remaining remnants of the total finned fish speartail were discovered in the waters of southeast Africa, and it is one of the world's most famous living fossils. China's current gymnosperms ginkgo, water pine and mammal giant panda are all recognized as precious living fossils by the world.

Other animals that were widely distributed in geohistory and have survived for a long time, such as the brachiopod sea bean tooth, are also "living fossils", but they are not relict organisms.

In short, relict organisms must be "living fossils", but "living fossils" are not necessarily relict organisms.

Examination knowledge of civil servants and public institutions.

Ginkgo biloba, giant panda, Chinese sturgeon, metasequoia, silver fir, dove tree, purple frog, frilled shark, Jurassic shrimp, three-eyed beetle, velvet worm, crocodile, platypus, nautilus, horseshoe crab, Martian ant, coelacanth, mantis shrimp, Latimai fish, Chinese alligator, baby fish.

Hundreds of thousands of years ago was the heyday of the giant panda, which was widely distributed in eastern China, and later the animals of the same period became extinct one after another, but the giant panda has been left behind to this day, and maintains the original ancient characteristics, so it is known as a "living fossil".

Living fossils of plants include: ginkgo, metasequoia, and fragrant fruit trees.

1. Ginkgo biloba. The ginkgo tree is also known as the white fruit tree, and in ancient times, it was also known as the duck's foot tree or the gongsun tree. More than 270 million years ago, the ancestors of ginkgo biloba began to appear, and it was still a higher plant compared to the ferns that were all over the world at that time.

More than 170 million years ago, ginkgo biloba has spread all over the world like the dinosaurs that dominated the world at that time, and later, most of the ginkgo biloba became extinct like dinosaurs, and only a little bit was preserved in some parts of our country, and it has been passed down to this day and has become a rare treasure.

2. Metasequoia. Metasequoia is a deciduous and coniferous tree. It is one of the rare and precious plants in ancient times, and is a first-class protected plant in China.

Metasequoia, a precious relict plant that has experienced the catastrophe of the Quaternary glaciation, grows rapidly, reaching more than 10 meters in about 10 years, and can generally become mature in 20 years. The material is light and soft, the texture is straight, the structure is fine, it is a good material for shipbuilding, construction, bridges, agricultural tools and furniture, and a good raw material for the paper industry.

3. Fragrant fruit tree.

Deciduous trees. The leaves are opposite, stalked; Leaves broadly elliptic or broadly ovate-elliptic, entire; The leaves are triangular-ovate and early falling. The inflorescences are arranged in the form of panicles of the neck; The flowers are large, pale yellow, stalked; calyx small, 5-lobed, lobes triangular-ovate, exfoliating, in an inflorescence, one of the calyx lobes of some flowers expands into leaf-like, white and conspicuous, still persists after fruiting; The corolla is funnel-shaped, with villus, apex 5-lobed, lobes covered with shingle-like arrangement.

Living fossils of animals: Chinese salamander, crocodile lizard, naked sturgeon, nautilus, beaver...

Living fossils of plants: alder, thousand-year-old yew, sandy cloud, dove tree, silver fir...

1. Echidna.

This is the most primitive mammal, with spines on the back and sides, a slender mouth, and lives on non-insects, a bit like a hedgehog + anteater, and sometimes it looks quite cute. They are mostly found in areas such as Australia and are now endangered.

2. Sea turtles. Turtles are known for their longevity, and they actually have a long history. It is known that they are closely related to dinosaurs, crocodiles and even birds, and far from lizards and snakes. The first turtles probably didn't go into the water, and it's now generally accepted that they started going into the water about 200 million years ago, when there were even giant tortoises weighing up to 2 tons.

3. Crocodile. Crocodiles look like dinosaurs that barely survived the mass extinction, and they are one of the most primitive animals alive to date; Some believe that their swimming habits also helped them through that difficult period. Crocodiles are also internationally endangered.

4. Horseshoe crab.

This is a strange-looking arthropod, not a crab, whose scientific name is horseshoe crab; The body is brown, covered with a hard carapace, and has four eyes, two of which are compound eyes. Horseshoe crabs are ancient creatures called the trilobites, which are now fossilized. Adult horseshoe crabs always move in pairs and never separate.

5. Platypus.

The platypus is one of the most primitive and lowest-grade mammals, not viviparous but oviparous, they are native to Australia, they have basically not evolved much for hundreds of millions of years, and they are very amazing living fossils. Due to their peculiar appearance, scientists who initially received the platypus specimen even thought it was a prank.

1.Purple Frog 2Wrinkled gill shark 3

Jurassic shrimp 4Three-eyed beetle 5Velvet Worm 6

Crocodile slack Gong wall pretense to write a debate Tong pinefish 7Platypus 8Nautilus 9

Horseshoe crab 10Martian Ant 11Coelacanth 12

Mantis shrimp panda.

Panda, Ginkgo biloba, Chinese sturgeon, Nautilus, Qinling fir, Armored shrimp nigmus, Grass sparrow, Silver fir, Three-eyed wedge-toothed lizard, Yew, Ili River nudibranch, white-sided dolphin, dove tree, lobster flower, platypus.

Chinese sturgeon, giant panda, ginkgo tree, yew.

Giant pandas, ginkgo trees, Chinese sturgeons.

Living fossils, which can be vaguely called Jing's relics, refer to any kind of similar species of raw liquid scattered that only exist in fossils, and there are no other extant similar species. These species once survived major extinction events and retain their original characteristics from the past. Some of the ancient species of living organisms that exist are non-scientific terms.

Chinese tree species known as "living fossils" include: ginkgo, silver fir, dove tree, fragrant fruit tree, etc.

Animals known as "living fossils" include: giant pandas, "living fossils" in the water, Chinese sturgeon, etc. Among them, the giant panda is the most famous.

Living fossils refer to species with a long origin, widely distributed in the Tertiary or earlier of the Cenozoic Era, and most of the species have been extinct due to geological and climatic changes, and the shape of these existing organisms is basically the same as that found in fossils, retaining the original shape of their ancient ancestors. Most of its relatives are extinct and relatively isolated, and organisms that evolve slowly can be called relict organisms or living fossils.

As a result, some ancient creatures that have lasted for tens of millions of years have been formed, and other creatures of the same era have long been extinct, and only they have been preserved alone, suitable for the modern environment, living in an extremely small area, called "living fossils".

Living fossils refer to species that appeared in ancient times and survived until modern times and still retain some of their original characteristics and are not extinct. Living fossils can be divided into plant living fossils and animal living fossils.

Famous representatives of living fossils of plants: (list 5).

Cycads. Cycads first appeared in the Miocene (about 10 million years ago) and are embryonic plants. So far, it has been widely distributed in China, Japan, Indonesia, the Philippines and other places.

Cycads are versatile, both as ornamental plants and as medicinals; It can be wild or artificially grown.

Ginkgo. Ginkgo biloba first appeared in the early Cretaceous period (about 100 million years ago) and once existed in the same era as the dinosaurs. Nowadays, the number of ginkgo biloba preserved is very small, so ginkgo biloba is also called a "relict plant".

Dove tree. It is a relict plant left over from the Miocene (about 10 million years ago), which is a unique species in China and is currently listed as a national first-class protected plant.

Metasequoia. Metasequoia first appeared in the Cretaceous period, and scientists once found only fossils of metasequoia, and at one time thought it was extinct. However, it was later discovered that in China, the primary forest of metasequoia is still preserved, and it is now an endangered species of the International Union for Conservation of Nature.

Cyanobacteria. Cyanobacteria first appeared in the Proterozoic (about 2.5 billion years ago) and are one of the world's earliest and longest-surviving organisms, and are still not extinct. Distributed all over the world, cyanobacteria are extremely adaptable, can survive in alpine deserts and tropical deserts, and can be seen in hot spring vents with temperatures of up to 90 degrees Celsius.

Famous representatives of living fossils of animals: (list 5).

Chinese sturgeon. The Chinese sturgeon first appeared in the Triassic period (about 230 million years ago), and is an ancient fish between cartilaginous and hard bones. The Chinese sturgeon is currently listed as a national first-class protected animal.

Panda. The panda first appeared in the late Miocene (about 8 million years ago), and was first discovered in China, an endemic species of China, and is now one of China's national images.

Alligator. The Chinese alligator first appeared in the Paleozoic Era (about 100 million years ago), the same era as the dinosaurs. The Chinese alligator still retains primitive reptiles and dinosaur-like structures, which are living fossils.

The Chinese alligator is a national first-class protected animal and a critically endangered species of the International Union for Conservation of Nature.

Cockroach. The scientific name of cockroach "cockroach" first appeared in the Silurian period (about 100 million years ago), its history predates the dinosaurs, and it existed in the same era as the dinosaurs. Cockroaches not only successfully escaped the Cretaceous mass extinction, but also survived to this day, with footprints all over the world, and are well-deserved "Xiaoqiang".

Horseshoe crab. The horseshoe crab first appeared in the Devonian period (about 400 million years ago) and still retains its original and ancient physiognomy, and is closely related to trilobites. The blood of horseshoe crab can be ** traumatic bleeding and gastric bleeding, and has high scientific and medicinal value.