Close up of 'living fossils'

Although nearly every animal evolved to adapt to a new environment, some animals remained virtually unchanged from the infancy of evolutionary history. It is called "living fossils".

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Many fossils live more ancient than mammals; some species existed before the dinosaur era. Looking closely at animals almost unchanged over millions of years and continues to live in low life forms today.

1. Platypus

Platypus is an animal with egg-laying fur, whose beak contains poison. Charles Darwin used the term 'living fossil' for this species when observing them. The platypus lives in eastern Australia, the only animal in the Ornithorhynchidae family. This group of animals is thought to have separated from the mammalian layer 166 million years ago.

2. Horseshoe crab

Horseshoe crabs can hold the record as the oldest animal in the world still in existence today. Appearing from the Paleozoic era, horseshoe crabs already existed on earth before dinosaurs and survived many major extinction events. In 2008, the oldest horseshoe crab fossil was found dating back to 445 million years ago, according to the LiveScience report .

3. Shrimp tadpoles

Tilapia shrimp is an opponent for the title of the oldest living animal. This species has relatives of horseshoe crabs. According to the Telegraph report, today's tadpoles are identical to the specimen fossils dating back to about 200 million years ago. Shrimp tadpoles are now on the list of endangered animals.

4. Hand fin fish

Once thought to be extinct in the same major extinction event of the dinosaurs 65 million years ago, the finfish has caused controversy over whether this species represents a missing branch between marine and animal animals. shallow four feet. According to National Geographic , this animal was found again in 1938 and only two species of finfish are alive today. In 2007, a fossil fossil was found to be around 400 million years old.

5. Turtle turtle

The turtles have stepped onto the ground 40 million years ago, but they were completely unchanged during 215 million years of evolution, according to the Tortoise Trust.

6. Crocodile

More than 20 species of crocodiles and alligators today have evolved from about 320 million years ago, however, the basic physical characteristics of this reptile almost remain the same for 320 million years. Crocodile and American alligators share their ancestors, although these two groups split about 60 million years ago.

7. British snail dance

The British snail is the most primeval animal that survives, a group including squid and octopus. Originating from half a billion years ago, the British snail reached its peak during the Paleozoic period of about 505 million to 408 million years ago. Several species of English snail still exist today, not much changed from those of the ancestors.

8. Goblin sharks

Leprechaun sharks are rare ocean inhabitants with unique long noses that distinguish them from other sharks. They appear about 112 to 124 million years ago. About 200 fossils of various shark species have been found, according to the ReefQuest Shark Research Center. The oldest shark species lived before dinosaurs about 200 million years ago.

9. Cockroaches

Cockroaches are famous animals because of their viability. These insects can survive for weeks after losing their heads, even if they can survive the atomic bomb explosion. Cockroaches are also long-lived species. Cockroaches have appeared on Earth about 320 million years ago, with about 5 to 10 million cockroaches have different shapes, sizes and habitats. This picture shows the cockroach of Blaberus , one of the most giant cockroaches.

10. Sardines

Grouper was first described by scientists in the 18th century, but this ugly marine animal has existed for about half a billion years ago. Rocky grouper also represents an important evolutionary step. This ancient fish is probably one of the first animals to evolve a camera-like complex eye rather than a less sensitive eye like more primitive species. Thus, rocky grouper represents a defective branch in the evolution of animal eyes.

11. Deer mouse

Compared to other living fossil animals, the mouse deer is probably a "younger junior" . However, it is a relatively ancient animal compared to mammals. This animal is one of those breaststones that existed 35 million years ago, and of course they have not changed since their appearance.

12. Mars Ant (Martialis heureka)

Martialis heureka ants are considered 'Martian ants', all ants share the same ancestors: The next generation of ground-eating parasites (subterranean forager), however, progressed to 120 million Last year they began to work on the ground.

13. Seagull

It appeared about 760 million years ago, one of the oldest.

14. Bacteria

This is the earliest form of life on Earth. This micro-species has dominated the world for 3.5 billion years. Scary, they often cause many illnesses.

15. Fish Sturgeon

This fish is not dangerous, their existence is said to be in danger. The taste of this fish is loved by humans, they exist on Earth 200 million years.

16. Rock microorganisms Stromatolite

Bacteria on sedimentary rocks Stromatolite is one of the important samples in studying the formation of life on Earth. It is estimated that these bacteria have survived for about 34 million years.

The majority of ancient stromatolite rocks are of biological origin, they are formed with the effect of growing microorganisms on the ocean floor. The surface of microorganisms is covered with a layer of mucus to 'trap' the particles that pass.

In addition, microorganisms also grow silk threads that grab them when they pass. This buildup will form rock layers like today. Initially they have wave-bending layers, over time, these waves split into separate cylindrical blocks that grow taller.