1, China snail: it is a common species in China. The shell is 60mm high and 40mm wide. The shell is thin and strong. There are 6 ~ 7 spiral layers. The stitches are deep. Habitat in lakes, ditches, ponds and rice fields. Strong adaptability to dry and cold, can shrink the body into the shell, close the shell mouth with a shovel, shrink into the soil, and climb out when the environment is suitable. The breeding season of China snails in Beijing is from April to August. Mating is mostly carried out during the day, and the time is not fixed, and the elderly can reach 12 hours; Mother snails mostly give birth at night, with the largest number in June-July. The average number of pregnant snails in the nursery bag is more than 70, as high as 100. After they develop into mature snails, they give birth in vitro and live freely. Larvae can develop into snails after 65,438+0 years of growth. Adult snail meat tastes delicious and has high nutritional value. The main variety of edible snails sold in the domestic and international markets is China snail.

2. Snails: type species, which belongs to the genus Snail, is distributed in Dianchi Lake, Erhai Lake, Fuxian Lake, Yilong Lake and Datun Lake in Yunnan. The shell is huge, with a height of 77 mm and a width of 47 mm. The shell is thick and conical, with six spiral layers, and the shell surface has spiral edges and thorns. It can breed all year round. There are 3 ~ 7 embryonic snails in the cyst, and the height of the shell of the embryonic snail is more than 10 mm, and the young snail grows rapidly after giving birth and matures less than 1 year. The meat tastes delicious. Snail meat and snail yellow (male gonad) are all loved by people.

3. Hull snail: the model species of the genus Hull snail. Distributed in Hunan and Guangdong provinces. Individuals are smaller than the first two, and the shell is generally 25mm high and 15mm wide. The spiral layer has four layers, the spiral part is lower, and the body spiral increases, accounting for the vast majority of the whole shell. The mouth of the shell is large and oval. Perched in the river.