The name of the body structure of the crab, the body structure of the crab

The body of the crab is symmetrical and can be divided into frontal area, eye area, heart area, liver area, stomach area, intestinal area, and gill area. The two sides of the crab's body are connected by appendages. 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. The pair of appendages in front of them have strong chelae that can be used for foraging, 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, and they walk in a unique and interesting way, mostly walking sideways rather than straight forward.

Extended Materials. 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. They rely on the mother crab to give birth to baby crabs, and each time the mother crab lays a large number of eggs, the number of which can reach more than millions. Crabs rely on the geomagnetic field to determine direction.

The genetic material of such organisms is complex and highly varied, often as many as more than 100 pairs.

Common crabs include hairy crabs (river crabs, hairy crabs, clear water crabs), pike crabs, etc. China's crab resources are very abundant, among which the hairy crabs produced by Gucheng Lake, Taihu Lake, Gaoyou Lake, Yangcheng Lake, Xilou Hairy Crab, Xinghua Hairy Crab and Hongze Lake Hairy Crab in the lower reaches of the Yangtze River are the top quality.

1 family of decapods, the shape of the cephalothorax varies, most of them are square or transversely rectangular, and some are spherical or square. The forehead is narrow, often bent downward, and the eye sockets are deep and large. The first antennae are folded longitudinally, or obliquely horizontally.

The mouth is large, and the anterior part is slightly narrower than the posterior. The third jaw foot mostly completely covers the oral cavity and the outer limbs are elongated. Males tend to have narrow strips on their abdomen.

There are sand crabs, fiddler crabs, big-eyed crabs, monkey-faced crabs, and snap crabs.

Long-legged rectangular crab.

This entry will be reviewed by the "Science Popularization China" Science Encyclopedia Entry Compilation and Application Work Project.

Metaplax longipes (scientific name: metaplax longipes) is an animal of the genus Metaplax Longipes. Distributed in Hong Kong and Guangdong, Fujian, Zhejiang and other places in Chinese mainland, the living environment is seawater, mainly living on intertidal mud beaches.

Scientific name in Chinese. Long-legged rectangular crab.

Latin scientific name. Metaplax Longipes Stimpson kingdom Animalia.

Phylum Arthropoda: Phylum Arthropoda.

Class Crustacea: Crustacea.

Subclass. Malacostraca: Subclass mollusc.

Mesh decapoda: Decapoda.

subhead. Brachyura: Short-tailed suborder.

Family Grapsidae: Crabaceae.

Subfamily. Sesarminae: Subfamily Crab.

Genus Metaplax: Genus Crab rectifolis.

Area of distribution. North Korea, Japan, Taiwan Island, and Guangdong, Fujian, Shandong, Liaodong Bay and other places in Chinese mainland.

The hard carapace of the crab protects the crab from predators, but the carapace does not expand as the body grows. Therefore, the growth of crabs is interstitial, that is, after a period of time, the body will continue to grow after the old shell is shed. The largest crabs on the planet are spider crabs, with their feet spread out and wide to a meter, and the smallest crabs are bean crabs, which are less than half a centimeter in diameter.

The crab thoracic cavity has five pairs of appendages called thoracopods. The other four pairs of appendages are the feet of the crabs, and the crabs rely on these four pairs of appendages to move and move, and they walk in a unique and interesting way, mostly walking sideways rather than straight forward. The exception is monk crabs, which walk straight.

Crab roe is present in the body of the female crab, after breaking the shell of the crab, you can see that there is yellow crab roe near the mouth of the crab shell, and the crab roe of the part of the crab body exists in the middle of the left and right halves of the crab body, which is the location of the crab roe.

Crab roe is rich in protein and various minerals, eating can increase the content of amino acids in the body, promote the production of antibodies, have the effect of enhancing humoral immunity, minerals can promote the growth of physique, so eating crab roe has the effect of enhancing the body's resistance.

Precautions for crab roe

Most gout patients are accompanied by complications such as excess weight, elevated blood lipids, and fatty liver, which requires seafood cooking methods to be as simple as possible, mainly steaming, stir-frying, and stewing, and avoiding frying, frying, grilling, etc. This not only ensures that the nutrients are not completely destroyed, but also reduces the intake of salt and oil.

The bacteria in the body of dead crabs multiply rapidly and spread to the crab meat, decompose the amino acids in the crab meat, and produce a large number of harmful substances, and eating dead crabs may induce vomiting, abdominal pain, and diarrhea.