Shanghai Zhuji Yangcheng Lake Hairy Crabs Store (Zhu Ji Xie Zhuang)Shanghai Zhuji Yangcheng Lake Hairy Crabs Store (Zhu Ji Xie Zhuang)
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Composition of crab

(A), external form:

as a result of evolution, crab's head and chest has healed together, collectively known as the cephalothorax, are the main parts of the body, back and covered with a layer of hard carapace (also known as head and chest armor, commonly known as the crab). Crab's abdomen (commonly known as crabs cord) is divided into 7 sections, bent to the front, attached to cephalothorax ventral surface, the shape of the abdomen, in growing up, females are round, male crabs are still narrow triangles, therefore, commonly known as the female crab, male crab, is one of the most significant differences between male and female symbols. Thoracic legs is a thoracic appendage, including a pair of claw foot and four on the back foot, are organs of action. Claw foot powerful pincer, Palm keys hair, especially the male crab is also one of the differences between the male and female gender symbols. Second to fifth pairs of thoracic legs the same structure, also known as step foot.

(b) the internal structure:

crab with complete various organs in the body, specifically outline description.

(1) the digestive system: including the mouth, esophagus, stomach, intestinal, intestine and anus. Between the palatal, surrounded around the upper lip and the second lower lip. Esophagus is short and straight, the end into the dilated stomach. The structure of the stomach, look for triangular sacs can be divided into the cardiac stomach and the pyloric stomach part II. Intestine is short, after bowel intestine, long end for the anus. The liver is the only crab digestive gland, Orange, left, is very large in size. A pair of hepatic duct into the intestine, conveying digestive juices.

(2) the respiratory system: the respiratory system of Eriocheir sinensis is 6 pairs of Gill, in the head and chest in the Gill cavity on both sides. The Gill cavity through holes and into the water outlet holes with the outside world.

(3) the circulatory system: the center of the heart in the head and chest, under the carapace, is a five-sided polygon, outsourcing is a wall of pericardial sac and a strap connected to the wall. Total 7 issued from the heart arteries, 5 forward and 2 backward, artery before are 1, 2 side artery, hepatic artery and 1 2 thoracic artery, the artery after the 1. Crab blood is colorless, by many macrophages (cells) and Lymphoma make up, serotonin is dissolved in the lymph.

(4) the excretory organs: the excretory organ of antennal gland is crab, also known as the "green gland", covered on the back of the stomach, both right and left, as an oval sacs.

(5) the nervous system: at the back of the head and chest, esophagus, within the process, there is a slight 6-sided ganglia. The cerebral ganglia, also called the brain. Forward from the cerebral ganglia and issued 4 major nerve on both sides, followed by the first antennal nerve, eye, skin, nerves and the second antennal nerve.

cranial nerves back through a pair of circumpharyngeal nerve joins with the cephalothorax ventral nervous system. From the esophagus surrounding pharyngeal nerve on both sides of a pair of sympathetic to the internal organs. Close to the back side of the esophagus, and there is a small transverse nerves around two surrounding pharyngeal nerves connect to form an Wai pharyngeal nerve ring.

ventral surface of the central nervous system consists of the nerves of the thoracic ganglion and the issue of form. Divided into many branches spread throughout the abdomen, abdomen feels very sensitive.

(6) the sense organs: eyes, eyestalk, both upright and recumbent, handles events.

statocyst, degradation, hidden in the base section of the first antennae. No balance in stone, openings have been closed.

sensory hair located in the second antennae and a second foot on the knuckles of palate and taste. Setae on the body and appendages with a sense of touch.

(7) the reproductive system: the sex gland located under the carapace. Male and female reproductive organs including ovaries and fallopian tubes in two parts. Around two leaves to be associated, "h"-shaped, mature ovarian Garnet or cameo, was very advanced. Oviduct is very short, tip the spermathecae, female hole opening on the Plastron. Within spermathecae of mated with semen, expanding milk ball.

testicular white, about two each have a vas deferens is connected at the bottom. Vas deferens back thick, muscular, ejaculatory ducts. Ejaculatory ducts in the membrane inside and accessory sex gland under convergence, convergence after a pipe diameter markedly thinner, through muscle, openings in the shell membrane protrusions of the seventh section, penis, about 0.5 cm long. Accessory sex gland is branched pipe, secretion of thick, creamy.