Horseshoe crabs (horseshoe crab) Horseshoe crab is in fact not true crabs, but the primitive arthropods. ?? Have a large disk-shaped body, slender needle-like tail. ?? Their ancestors can be traced back to the Cambrian period, but not until the Jurassic period, before the development of a horseshoe shape. Although still today there are five horseshoe crab, but after the Cretaceous period began,?? Are on the less common. Both the horseshoe crab looks like a shrimp like a crab, as the "horseshoe crab", is a class of trilobites (now only a fossil) is as old as the animals. Horseshoe crab's ancestors appear in the Paleozoic geological history of the Devonian, when the rise of dinosaurs yet, the original fish has just come out, over time, with its contemporary animal or evolution, or extinction, while the values of only 400 million from the horseshoe crab years ago the advent of the original and still retain their ancient appearance, the horseshoe crab has a "living fossil," said. Whenever the horseshoe crab's breeding season in spring and summer, male and female, once married, they were inseparable, often laden with hypertrophy of the female horseshoe crab thin husband stumble. At this time caught a crab, is brought to a pair of horseshoe crab to enjoy it, "sea duck" reputation. TAL has four eyes. Carapace 0.5 mm in the front two small eyes, small eyes, the most sensitive to UV light, indicating that only the eyes to perceive light. On both sides of the horseshoe crab's carapace has a pair of compound eyes, each eye is composed by a number of small eyes. It was discovered that the compound eye of Limulus there is a phenomenon of lateral inhibition, that is, images of objects can be more clear, this principle is applied to television and radar systems, to improve the clarity of television and radar imaging display of sensitivity. To this end, the unknown millions of years old animal leaped into a striking modern bionics in "Star." Horseshoe crab blood contains copper ions, its blood is blue. The blue blood of the extract - "LAL", can accurately and quickly detect whether the internal organization of the human body due to bacterial infection and disease; in the pharmaceutical and food industries, it can be used to monitor toxic pollution. In addition, the horseshoe crab meat, eggs can be consumed.
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Morphological characteristics of horseshoe crab
Is a class of trilobites (now only a fossil) is as old as the animals. Horseshoe crab's ancestors appear in the Paleozoic geological history of the Devonian, when the rise of dinosaurs yet, the original fish has just come out, over time, with its contemporary animal or evolution, or extinction, while the values of only 400 million from the horseshoe crab come out years ago it still retains the original and ancient appearance, so crab a "living fossil," said. Horseshoe crab is in fact not true crabs, but breathing with gills original arthropods. A large disk-shaped body, slender needle-like tail. Their ancestors can be traced back to the Cambrian period, but not until the Jurassic period, it developed a horseshoe shape.
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Horseshoe crab species introduced
马蹄蟹的品种介绍
The world's only four: Chinese horseshoe crab, American horseshoe crab, Limulus Malay king crab and round tail.
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Horseshoe crabs habits
Live in deep offshore waters, are not good at swimming, with a wing flap on the body to endure into the water, or slowly crawling on the seabed. Seabed ooze the most suitable for them, where small clams and larvae, with the head as a Miner to dig out from the ooze. Where most of the year, live in coastal.
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The propagation characteristics of horseshoe crab
Each spring, mature adult crabs migrate in droves to the _select_ed lay their eggs on the beach. Spawning ground is usually the impact of waves to the beach, this choice led to the decline of many individuals. It has not yet fully understand the reasons for this breed of migration, but it seems the full moon spring tide, when tens of thousands of crabs migrate to the shore, in the climax at the sand pit, the birth of female crabs in the pit 200-300 eggs, before being buried in sand fertilized egg to the male crab, and then allowed to develop. With those exposed in the surf on the coast, many of crab thrown by the waves, its fragile, soft body exposed to the hot sun, very easy to gather on the beach became the prey of the seagulls. Can be used as a lever of its long tail, to correct their course, but quite difficult. However, the risk seems worth it, because in the more secluded beaches, spawning the female crab is likely to survive, but the eggs are hatched almost impossible. Laid eggs hatch four weeks, just in time for the next full moon spring tide, the newly hatched crab rushed into the sea. There is no obvious reason to explain its ancient lineage survived because, apparently it is well adapted to their unique way of life, it is very strong, enough to suffer huge losses during the spawning survived.
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The scientific value of horseshoe crab
Eye Four eyes. Carapace 0.5 mm in the front two small eyes, small eyes, the most sensitive to UV light, indicating that only the eyes to perceive light. On both sides of the carapace has a pair of compound eyes, each eye is composed by a number of small eyes. It was discovered that the compound eye of Limulus there is a phenomenon of lateral inhibition, that is, images of objects can be more clear, this principle is applied to television and radar systems, to improve the clarity of television and radar imaging display of sensitivity. To this end, the unknown millions of years old animal leaped into a striking modern bionics in "Star." Blood Horseshoe crab blood to other current research and application in medicine as scientists have continued to explore and evolving. Edible
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Horseshoe crab anecdotes
The "love" steadfast Horseshoe crabs can be called for their steadfast companion. Adult horseshoe crab is always in pairs, never separated. Male female horseshoe crab Limulus always lying on the back, one does not leave; and female horseshoe crab Limulus always burdened with the male to move around. When people catch king crab fishing is always caught a pair is the best proof. It is said that if people will Zhuozou female horseshoe crab, Limulus male will remain in place waiting for the return of female horseshoe crab, a female horseshoe crab does not appear, the male crab will not leave. (This is actually because people usually only in the horseshoe crab, "the couple" both ashore to lay eggs when caught king crab, resulting in the illusion.) In Taiwan, a famous local artist Mr. Wu Dingren's pen was actually fascinating and charming. There Ci Yishou as follows: Min Hai Hau East Houqingxihou Yunancangming bitter North Sea Wang Hong sea lying blue delicious name wrong Limulus in the hundreds of millions of years ago and be able to reproduce is not bad, on the one hand is the horseshoe crab's own reproductive ability, on the other horseshoe crab meat because of poor taste, but after eating the body prone to allergies and toxic shock due to horseshoe crab toxicological properties have special physical, very little has been killed. However, in recent years, because some people do not really know to eat crab on health dangers, some of the small traders in their economic interests, driven by speculation and intentionally misled during the blind, resulting in the paleontological resources have been severely LAL damage. This Eastern king crab fishing and the killing of those who risk their lives for the expense of eating behavior should arouse people's attention. According to the world medical research shows that consumption of king crab on the health and safety there is a great danger: 1, the horseshoe crab meat contains a non-specific Sensitization to proteins of the macromolecular material eating horseshoe crab can cause allergic skin rash, swelling and itching, leading to serious or fatal anaphylactic shock and toxicity, poisoning, high mortality . This phenomenon as early as 1988, "Chinese Journal of Marine Drugs," the third phase, from the Guangxi Institute of Oceanography Liangguang Yao, who reported that the "Toxic Guangxi coastal crab Preliminary Report," consistent with the situation. 2, the horseshoe crab meat contains a lot of inner amide purine chemicals. According to modern medical research showed that: purine metabolism of substances in the body when not fully or accumulation, leading to gout important reason for the development of disease. 3, the color blue horseshoe crab blood, Limulus plasma is because the main components of hemocyanin, the blue blood protein per 1ml of heavy metal organic copper (Cu2 +) in the 0.28 ~ 0.31mg (horseshoe crab from the water the length of time differences). Per only (male, female) calculated the ratio of the average weight of horseshoe crab, adult crab meat containing plasma and from the quality of this copper (Cu2 +) at 600 ~ 1300mg. According to medical studies show that: a heavy metal (Cu2 +) into the human body with the blood circulation mainly accumulate in the liver and kidneys, the liver and kidney dysfunction, may accelerate the liver cell necrosis, or the development of cirrhosis and renal failure caused by ammonia poisoning complications. In addition, the (Cu2 +) quality can also lead to human hematopoietic dysfunction and affect the normal development of children and other nervous system. There may be some people think they have eaten crab, how come no allergic reaction? This is because each person's physical existence of the reasons for individual differences. While eating crab did not occur when the allergic reaction, but the horseshoe crab Limulus blood and meat contain chemicals harmful to human health is no doubt that when these chemicals accumulate in the body or metabolism is not complete, we will certainly harmful to human health damage. Therefore, for effective protection and rational use of horseshoe crab resource to ensure ecological balance of nature and fully reflects the social value of horseshoe crab resource, please attach great importance to all levels of government and the masses of resources to protect the true meaning of Limulus. Also, for your health, please stop eating crab
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Marine life
Both the horseshoe crab looks like a shrimp like a crab, as the "horseshoe crab", is a class of trilobites (now only a fossil) is as old as the animals. Horseshoe crab's ancestors appear in the Paleozoic geological history of the Devonian, when the rise of dinosaurs yet, the original fish has just come out, over time, with its contemporary animal or evolution, or extinction, while the values of only 400 million from the horseshoe crab years ago the advent of the original and still retain their ancient appearance, the horseshoe crab has a "living fossil," said. Whenever the horseshoe crab's breeding season in spring and summer, male and female, once married, they were inseparable, often laden with hypertrophy of the female horseshoe crab thin husband stumble. At this time caught a crab, is brought to a pair of horseshoe crab to enjoy it, "sea duck" reputation. TAL has four eyes. Carapace 0.5 mm in the front two small eyes, small eyes, the most sensitive to UV light, indicating that only the eyes to perceive light. On both sides of the horseshoe crab's carapace has a pair of compound eyes, each eye is composed by a number of small eyes. It was discovered that the compound eye of Limulus there is a phenomenon of lateral inhibition, that is, images of objects can be more clear, this principle is applied to television and radar systems, to improve the clarity of television and radar imaging display of sensitivity. To this end, the unknown millions of years old animal leaped into a striking modern bionics in "Star." Horseshoe crab blood contains copper ions, its blood is blue. The blue blood of the extract - "LAL", can accurately and quickly detect whether the internal organization of the human body due to bacterial infection and disease; in the pharmaceutical and food industries, it can be used to monitor toxic pollution. In addition, the horseshoe crab meat, eggs can be consumed.
