Nautilus Pompiplius is a mollusk and shellfish belonging to the order Nautilus in the suborder Tetrapoda of the class Cephalopoda. There are few existing species, but all are warm-water animals. They are endemic to the sea areas of the Indian and Pacific Oceans, and are found in Taiwan, Hainan Island and the islands of the South China Sea in China. Nautilus basically belongs to the benthic animals, usually more in 100 meters of deep water bottom with the wrist slowly creeping. They can also use secretions from their wrists to attach themselves to rocks or coral reefs. They can rely on the inflatable shell chamber in the water to swim, or to funnel the water spray way "fast retreat". On calm nights after storms, the nautilus floats comfortably at the surface with its shell up and mouth down, its head and wrists fully extended. These animals are nocturnal and feed mainly on benthic crustaceans, especially small crabs. The shell of the nautilus is beautiful and quite distinctive in its construction. This calcareous shell is large and thick, symmetrical from side to side, and rotates dorsoventrally along one plane in a spiral. The shell has a smooth, grayish-white exterior, interspersed with many orange-red corrugated shapes at the back. This can be clearly seen on the nautilus stamps issued by all countries. The shell consists of two layers of material, an outer magnetic layer and an inner layer of lustrous pearl. The inner cavity of the shell by the compartment is divided into more than 30 shell chamber, the animal hides in the front of the last next door, that is, known as the "living room" in the largest shell chamber. The other layers are called "gas chambers" because they are filled with gas. Each compartment has a concave surface towards the mouth of the shell, and a small circular hole in the center, through which it is connected by cords leading from the back of the body. The truncated Nautilus, like a rotating staircase and a pleated skirt, with one compartment spiraling from small to large, determines the sinking and floating of the Nautilus, which is the key to unlocking the submarine's conception of the world's first battery-operated submarine and the first nuclear submarine, thus named the "Nautilus". There are few existing species of Nautilus, but there are as many as 2,500 fossilized species. Nautilus fossils, also known as chrysocolla, constitute an important stratigraphic indicator of the highly thriving populations that existed during the Paleozoic era. Using these fossils, which existed at different address ages, geologists can study the animal evolution, energy minerals and environmental changes associated with them, providing scientific data for utilizing nature and transforming it. The Nautilus Reveals Nature's Evolution In September 1952, Algeria hosted the 19th International Geological Congress, for which a set of commemorative stamps was issued for the first time, the first of which featured the fossilized nautilus, which is 450 million years old. Since then, pictures of nautilus fossils have frequently appeared on stamps. In 1996, the China Clipper reprinted an article about another role of the nautilus fossil: "Recently, the United States, two geographers based on the study of the nautilus fossil, put forward an extremely bold insight, the moon is far away from us, it will be getting darker and darker. The nautilus was almost worldwide during the Paleozoic era, but is now largely extinct, except for six species of nautilus that still exist in the deep waters of the South Pacific. The two scientists looked at several extant species of nautilus and found that the undulating threads on the shell have tree-like properties. The threads are divided into many compartments, and although the width varies, the number of tiny wavy growth lines on each compartment is around 30, which is exactly the same as the number of days in a modern-day plastron (a month in the Chinese lunar calendar). Observations found that the nautilus wave-like growth lines every day long one, monthly long a compartment, this special growth phenomenon so that the two geographers were greatly inspired. They observed the ancient nautilus fossils, and were surprised to find that the number of growth lines per interval of the ancient nautilus and with the age of the fossil backward and gradually reduced, while the same geological age is fixed. The study shows that the growth lines on the shell of the Cenozoic Oligocene is 26; Mesozoic Cretaceous is 22; Mesozoic Jurassic is 18; Paleozoic Carboniferous is 15; Paleozoic Ordovician is 9. From this, it is inferred that during the Paleozoic Ordovician, more than 42,000 million years ago, the moon circled the earth for only nine days. Geographers also calculated the distance between the moon and the Earth according to the law of gravity and other physical principles, the result is that more than 400 million years ago, the distance is only 43 % of the present. Scientists have carried out a computational study of recorded lunar eclipses over the last 3,000 years and the results are in perfect agreement with the above reasoning, proving that the moon is moving away." The Nautilus is truly instrumental in revealing the mysteries of nature's evolution. Recently, with the giant panda as belonging to the national level of protection of animals with the "living fossil" known as the nautilus also settled in the Beijing Oceanographic Museum. These nautilus, after 65 million years of evolution, appearance, habits and 450 million years ago has lived in the ocean ancestors compared to almost no change, which makes scientists also marveled! The six nautiluses that came from abroad to make their home in the Beijing Oceanographic Museum are adsorbed on the underwater reef and are the size of an adult's fist. Their appearance is very beautiful, much like a colorfully dyed enamel cylinder. The nautilus has a thin, lightweight, spirally coiled shell with a white or cream colored surface. From the umbilicus of the shell radiate reddish-brown zigzag stripes, much like the head of a parrot. The keeper used long tweezers to hold the squid meat and stick it underwater, and the originally motionless nautilus quickly acted, advancing forward by discharging the water inside the shell chamber, and could be suspended in the water like a submarine, which was very magical! According to Mr. Yang Daoming, an expert of the Oceanarium, these 1-year-old nautilus have not yet reached the age of having children, so it is not yet clear whether they are male or female from the outside. Currently, these rare marine creatures are in a state of recuperation, and can eat very fresh shrimp and fish every day, living a life of meals. Of course, they are also tasked with scientific research, the Beijing Oceanographic Museum will carry out scientific research on deep-sea fish farming and animal evolution. Nautilus is the national level of protection of animals, belonging to the ancient mollusks, has hundreds of millions of years of life history, known as the "living fossil", in the study of animal evolution has a high value. At present, there are only four species left in the world. Nautilus and squid belong to the same mollusc cephalopods, but the appearance and gastropods of the common snails are similar: a single spiral shell; they will be curled up in the shell, through the shell of the interior air regulation to control the body's sinking and floating. They are diurnal, rising to the surface of the water in the evening to feed, and have been domesticated to feed during the day on frozen fish, squid and shrimp. The nautilus has multiple fascinating lives. It has been nicknamed by paleontologists as the "Latiman fish" of invertebrates, a synonym for living fossil. Scientists have marveled at the fact that these chambered nautiluses have evolved over 65 million years with seemingly little change in appearance! Their ancestors, of which there are more than 30 species, were swept to extinction along with the dinosaurs in the great cataclysm of 65 million years ago. The few remaining living Nautilus descendants inhabit the Indian and Atlantic Oceans, leaving the "Pontiac Nautilus", the "Deep Navel Nautilus", the "Big Head Nautilus", and two uncertain species. Pontiac nautilus, deep-bottomed nautilus, big-headed nautilus, and two less certain species. Scientists call it a living fossil because it is related to the chrysomelids, which also have multi-chambered shells. Nautilus belongs to the Cephalopoda class of mollusks, which also includes squid, octopus and cuttlefish, and is the most specialized of the marine mollusc phylum, and is known to marine biologists as the jet propeller of the ocean. Through the water constantly through the body of the animal's coat membrane, and then by the tubular muscle itself and the body of the animal expansion software and jet propulsion procession to the rear. The nautilus is even more specialized, its shell is divided by a transverse partition, separating more than thirty separate small rooms, the last (and largest) room is the animal body living place. The last (and largest) chamber is where the animal resides. As the animal grows, the chambers periodically advance outward, and behind the outer coat membrane, calcium carbonate and organic matter are secreted to create a new partition. In the middle of the plate, a thin tube runs through and connects the shell: it transports gases (mostly nitrogen) into the chambers, thus controlling the floating and moving of the shell chambers like a submarine. Nautilus is usually active at night and rests on the ocean floor during the day, holding its tentacles on the rocky substrate. Living on the surface of the ocean all the way down to six hundred meters deep, the amount of gas must be able to be regulated so that the nautilus adapts to the pressures of different depths. When the animal dies, the body software sheds its shell and sinks, while the outer shell remains adrift at sea for the rest of its life. Its name is in fact derived from the Latin word "sailor", people in ancient times, only to find groups of nautilus empty shells with the waves; and mathematicians, even more fascinated by the nautilus shell section of the beautiful conch line. Since ancient times, the nautilus with its dazzling beauty to let people send out heartfelt praise. Unearthed in the Eastern Jin Dynasty Nanjing Wang Xingzhi couples tomb of the nautilus cup to the sea of rare shellfish nautilus shell for the cup body, the shell outside the copper rim with buckle, both sides are equipped with copper ears, the natural formation of water wheels within the conch piece can store wine, well-conceived, unique modeling, so far is the only one in the six dynasties in the archaeology. Nautilus cup is rare in excavated relics, but not rare in ancient poetry. In Li Bai's Xiangyang Song, there is the verse "Cormorant ladle, nautilus cup, a hundred years and 36,000 days, one day must pour 300 cups". In addition to its appearance, the nautilus is a miracle of creation because of its precision construction. Human imitation of the nautilus drainage, suction floating, sinking way, made the first submarine. 1954 the world's first nuclear submarine "Nautilus" was born, "Nautilus" number of total weight of 2,800 tons, * * * cost 55 million U.S. dollars. The entire hull length of 90 meters, the average speed of 20 knots, the maximum speed of 25 knots, can be in the maximum speed under continuous navigation for 50 days, the whole 30,000 kilometers without adding any fuel. Compared with ordinary submarines at that time, the speed of the boat is about half as fast. The entire nuclear power plant occupies about half of the hull. Hull shape and internal, power instruments and combat equipment, are the most sophisticated scientific products, are the most streamlined appearance and simple control of the assembly, compared with ordinary submarines, "Nautilus" hull shell appears to be more thick, the diving depth of 150 meters or less, in the deep sea when traveling, by virtue of its specially installed sonar, you can Free to explore the way, never touch the reef and hit the rocks. According to the Israeli Ministry of Defense, the United States and Israel jointly developed the "Nautilus" laser weapon to become the world's first tactical high-energy laser weapon system to successfully shoot down rockets. Although the Nautilus is as rare as the giant panda, many people do not know. It is understood that some cities along the coast of China have appeared in the phenomenon of selling nautilus artifacts. According to the Aquatic Wildlife Resources Protection Law, the nautilus belongs to the national level of protection of animals, if you need to sell, each must pay 30,000 yuan to the state to protect the resources of the fee, and at the same time must be approved by the Ministry of Agriculture in order to operate. However, the illegal operation of nautilus behavior has been prohibited. Relevant persons believe that the reason for the repeated prohibition is because the owner of the illegal trafficking in a very secretive way, the goods are not on the shelves, and some shopkeepers even nautilus shells hidden away from the store a certain distance from home, or other difficult to find out where the fisheries and industry and commerce departments of the shopkeepers are generally known to the investigation and handling is very difficult. Can the magical Nautilus continue to be beautiful for another 450 million years? Today's lesson: The water flows continuously through the coat membrane of the animal body, and then through the tubular muscle itself and the expansion software of the animal body and ejected to the back of the procession. The nautilus is even more specialized, as its shell is divided into more than 30 separate chambers by a transverse partition, the last (and largest) of which is where the animal lives. The last (and largest) chamber is where the animal resides. As the animal grows, the chambers periodically advance outward, and behind the outer coat membrane, calcium carbonate and organic matter are secreted to create a new partition. In the middle of the plate, a thin tube runs through and connects the shell: it transports gases (mostly nitrogen) into the chambers, thus controlling the floating and moving of the shell chambers like a submarine. Nautilus is usually active at night and rests on the ocean floor during the day, holding its tentacles on the rocky substrate. Living on the surface of the ocean all the way down to 600 meters deep, the amount of gas must be able to be regulated so that the nautilus adapts to the pressures of different depths.