How many legs does a crab have, how many legs does a crab have?

1 crab has 8 legs, and two are its big pincers, called 'chela', but the encyclopedia says 5 pairs of feet, but Xunzi's "Persuasion": "Crab six kneels and two chela". That means crabs have eight legs.

Modern Chinese Standard Dictionary", crab explains it this way: the whole body has a shell, and there are five pairs of feet. In this way, the crab should be 10 legs.

Normal crabs have a pair of pincer-like feet to burrow, defend and attack, called chelicerae; The remaining four pairs of feet are used for walking or paddling, and are called gaitk. Chelicerae and gait do not function the same. Therefore, strictly speaking, the crab should have eight legs that can walk, and two chelicerae that do not have the ability to walk.

So I think both the strip and the strip are right, depending on how you define it.

8 legs, two large pliers do not count.

In fact, crabs have eight legs and two chela, but the first three legs of the crab are used for walking, and the last two legs are used for paddling, and the last two legs have no other functions, so they are called six kneeling.

The crab has appendages attached on both sides of its body. Appendages on the head, called antennae, have the sense of touch and smell, and some appendages have the function of mouths, which are used to tear food and put it in the mouth.

The crab thoracic cavity has five pairs of appendages called thoracopods. A pair of appendages in front of them have strong chelae that can be used for feeding, and the remaining four pairs of appendages are the feet of crabs, and crabs rely on these four pairs of appendages to walk and move, and they walk in a unique and interesting way, most of them walk sideways rather than straight forward, except for monk crabs, which walk straight.

In the persuasion, it is said that the crab six kneels and the two chelates are wrong.

Crabs are crustacean.

8 legs 2 pliers.

Crabs have 8 legs that are on both sides of the body, and the crab's large pincers do not belong to the crab's legs.

A normal crab has a pair of pincer-like feet that are used to burrow, defend and attack, called chelicerae, and the other four pairs of feet are used for walking or paddling, called gaites. Chelicerae and gait do not function the same, so strictly speaking, a crab should have eight legs that can walk, and two that do not have the ability to walk.

螃crab (páng xiè): Animalia, phylum Arthropods, Crustacea, Molluscs, True Softnails, Decapods, Ventral Embryos, Brachycda. It is a crustacean whose body is protected by a hard shell and breathes by its gills.

Taxonomicly, it is the same animal as shrimp, lobster, and hermit crab. The vast majority of species of crabs live in the sea or near the sea, but some inhabit freshwater or land.

Crabs spend most of their time looking for food, they are generally not picky eaters, as long as the chela can get their hands on food, small fish and shrimp are their favorite, but some crabs eat seaweed, and even animal carcasses and plants can eat.

Crabs eat other animals, and other animals may also eat crabs, for example, humans use crabs as a delicacy, and water birds also eat crabs, and some fish also like humans to eat crab legs. When young and juvenile crabs float in the sea in groups, they may be preyed upon by other marine organisms, so crabs have to lay a lot of eggs when laying eggs to ensure the survival rate of crabs.

Answer: The crab has 8 legs, which are on the sides of the body, and its large pincers are not legs. A normal crab has a pair of pincer-like feet that are used for defense and offense, known as chelicerae, and the remaining four pairs of feet are used for walking or paddling, called gaites. A small number of crabs grow and breed in fresh water, mostly inhabiting the rocks of streams, and a few crabs can adapt to life on land, burrowing in damp mud holes, and migrating to the sea during the breeding period.

1. The crab has 8 legs, which are on both sides of the body, and its large pincers are not legs. A normal crab has a pair of pincer-like feet that are used to defend, burrow, and attack, called chelicerae, and the remaining four pairs of feet are used for walking or paddling, called gaites. The frontal part of the crab** has a pair of antennae, the outer side is a stalked compound eye, and the mouthparts include a pair of large jaws, two pairs of small jaws, and three pairs of jaw feet.

2. A small number of crabs grow and reproduce completely in fresh water, mostly inhabiting under the rocks of mountain streams, and a few crabs such as ground crabs can adapt to land life, burrow in damp mud holes, and migrate to the sea during the breeding period. Most crabs are omnivorous, a few crabs such as the window crab scrape or filter feed on algae and organic detritus, and some crabs are carnivorous, such as the pike crab, which can prey on shrimp, fish and molluscs.

2. Nutrients of crabs.

1. Each 100 grams of crab edible part contains fat grams, protein grams, calcium 126 mg, phosphorus 182 mg, iron milligrams and rich vitamin A and vitamin B1.

2. Taking the saw-edge blue crab as an example to analyze its nutritional composition, the components of the saw-edge blue crab are rich in protein, among which the protein amino acids are complete, and the essential amino acid score is as high as the female gonadal content, which is the highest protein content in the fresh product.

3. The body of the saw-edge blue crab is rich in fat and unsaturated fatty acids (UFA), and the UFA of the muscle is as high as high. The unsaturated fat content of saw-edge blue crab is high, especially the content of EPA, DHA and -3 fatty acids that cannot be synthesized in the human body, and the content of liver CA is also very high, second only to dace, stone snail, shrimp skin, dried shrimp and clove fish, and the content of other essential elements Cu, Zn, mg, Fe and Mn is also high.

Crabs have a total of 10 legs, which is strictly speaking, but when I was a child, I memorized Xunzi's "Persuasion": Crab six kneeling and two chela, and also sang crab children's songs: Crabs have one claw and eight claws, and the two pointed ends are so big.

So in most people's minds, crabs have six legs plus two claws.

But crabs are a class in the order DecapodNormal crabs have a pair of pincer-like feet to burrow, defend and attack, called chelicerae; The remaining four pairs of feet are used for walking or paddling, and are called gaitk. Chelicerae and gait do not function the same.

Therefore, strictly speaking, the crab should have eight legs that can walk, and two chelicerae that do not have the ability to walk, that is, ten legs.

The common characteristics of all crabs are:

1. All crabs are covered with chitin carapaces. The carapace protects the body of the crab, and the juvenile crab needs to grow bigger and bigger through molting, and the new shell that has just been molted is soft and collapsed, but the new shell will harden within 12 hours. This is also one of the reasons why crabs are classified as molluscs.

2. All crabs belong to the decapoda below the class Mollusc. That is, when calculating the crab's legs, in addition to the feet, two pincers should be added.

3. All crabs belong to the short-tailed suborder under the order Decapodae. The crab's navel resembles a folded tail that clings to its body, and the female crab during the breeding season carries fertilized eggs at its umbilicus. Because of this characteristic, all crabs are classified as short-tailed suborders under the order Decapodae.

A crab has 8 to 10 legs.

The number of legs of a crab varies according to its species. Some crabs have four pairs of legs for a total of eight, while others have five pairs of legs for a total of ten. There are even some crabs with more than ten legs, and these crabs are called "multi-legged crabs".

Different species of crabs adapt to different environments and lifestyles. For example, some crabs live on sandy beaches and need to dig burrows in the sand, so their legs are longer and more powerful so that they can dig deeper burrows.

Nutritional value of crabs:

1. Crab hail is rich in protein, less fat and carbohydrates.

2. The cholesterol content in crab roe is high.

3. Crabs are rich in calcium, phosphorus, potassium, sodium, magnesium, selenium and other trace elements.

4. Crabs are rich in vitamin D.

5. It also contains a higher content of oil and cholesterol, for people with high blood pressure, coronary heart disease, and atherosclerosis, try to avoid eating crab roe from the source to avoid rising blood cholesterol. <>

Ten legs. Crabs are a group of decapods. The crab thoracic cavity has five pairs of appendages called thoracopods.

The pair of appendages in front of them have strong chelae that can be used for feeding, and the other four pairs of appendages are the feet of the crabs, and the crabs rely on these four pairs of appendages to walk and move.

Normal crabs have a pair of pincer-like feet to burrow, defend and attack, called chelicerae; The other four pairs of legs are all used for walking or paddling, and are called gaits. Chelicerae and gait do not function the same.

Therefore, strictly speaking, the crab should have eight legs that can walk, and two chelicerae that do not have the ability to walk, that is, dozens of legs.