Yes

Morphological characteristics

Nail snail dioecious, oviparous, egg-laying season in April to May, egg incubation time varies depending on the temperature, in the 16 to 23 ℃, it takes about 20 to 28 days. Young snails have the habit of floating on the surface of the water, and adult snails do not need attachments can also be dispersed with the current for a long distance. Scattered in the Yangtze River Basin, nail snail named subspecies, like inhabiting rivers and lakes, ponds, irrigation ditches, rice paddies and other places. Nail snail is the intermediate host of schistosomiasis, schistosomiasis can be triggered by human, animal and poultry schistosomiasis, a serious health hazard. The key to control schistosomiasis is to eliminate the snail, eliminate the snail is equal to cut off the intermediate link in the life history of schistosomiasis. Elimination of snails can take artificial capture, trapping, deep burial, hemlock and other measures. According to the life pattern of the snail, it can be carried out in combination with the construction of farmland water conservancy in winter. Hemlock in April before the rise in temperature is the most suitable, after May hemlock should be applied to injure the eggs of the drug, after June to eliminate the current year's young snails.

The snail shell is small, the adult body is 7-10 millimeters high, 3-4 millimeters wide, pointed conical, with 6-9 conch layers. The shell is thick and strong, with smooth surface or coarse or weak longitudinal ribs, and the bottom conch layer is enlarged. The shell surface is light gray, the mouth of the shell is ovoid, with a black frame, and there is a thick raised lip ridge on the dorsal side of the outer lip.

Life habitats: Nail snails are amphibious snails. Juveniles like to live in the water, adults generally like to live in the grass above the water line in the wet zone.

Breeding environment

Lake and marsh type: mainly in Hubei, Hunan, Anhui, Jiangxi, Jiangsu and other provinces along the Yangtze River and around the lakes, there are a large number of winter land and summer water on the continental beach, and the lower reaches of the Pearl River in a small area. Nail snail scattered area mostly live in the lakes and marshes along the lakes, continental beaches, grassy beaches, reed flats along the rivers, etc., this type of area reproduction of the nail snail shell is large and thick, shell surface longitudinal ribs coarse; was scattered in the form of a sheet. Water network type: It is mainly found in the 3 corners of the Yangtze River. The water system consists of rivers and irrigation ditches, which are crisscrossed and as dense as a spider's web. Nail snails scattered along the riverbanks, mostly inhabiting the waterline, under the 1-meter range of the lake embankment. However, the nail snail in the water mostly reproduces along the waterline in rivers, irrigation ditches, etc., and is seldom found in paddy fields and ponds. In this type of area breeding nails snail shell is thicker, shell surface has thin longitudinal ribs; hill type: mainly scattered in China 4 Sichuan, Yunnan, Guangxi, Fujian, Taiwan and the middle and lower reaches of the Yangtze River in the mountainous areas. Nail snail according to the water system dispersal, wide dispersal, environmental complexity, nail snail is mainly produced in the river, rice paddies, some areas of the hillside meadows are also available, these places of the nail snail shell is thinner, the shell surface is smooth without longitudinal ribs.

Breeding season: The snail is dioecious and oviparous. Mating can take place throughout the year, with spring mating the most, followed by fall. Eggs can be laid from November to July, but the most eggs are laid in March-May. Eggs are laid in moist soil, and hatch in less than a month at suitable temperatures (16-23°C). The hatchlings develop in two months when food is plentiful and the temperature is suitable.

Scattering range: the nail snail scattered in eastern Asia and Southeast Asia. China's mainland only Hubei snail.

Dispersal of the five subspecies: Hubei Nail Snail Fingerling subspecies (O.h.h .Gredler) is widely dispersed in the middle and lower reaches of the Yangtze River and in Guangdong and Zhejiang Provinces; it inhabits low-lying, plain areas; Nail Snail Hills subspecies (O.h.fausti Bartsch) is dispersed in the lower and middle reaches of the Yangtze River in the lower elevations of the hilly areas, but it is also found in the coasts of Dongtai and Dafeng of Jiangsu Province; Fujian subspecies (O.h.fuji) is widely distributed in the middle and lower reaches of the Yangtze River; and Fujian subspecies is widely distributed in the eastern parts of Asia. O.h.Tangi Bartsch (Fujian subspecies) is found in the coastal lowlands of southeastern Fujian; O.h.quangxiensis Liu et al. (Guangxi subspecies) is found in northern Guangxi, in thin sand and ravines with poor water retention at an elevation of 200(4) m. O.h.robertson Bartsch (Yunnan subspecies) is found in China's 4 rivers, Yunnan Province, and the Yunnan Province, and is also found in the coastal areas of Dongtai and Dafeng in Jiangsu Province; and O.h.robertson Bartsch (Yunnan subspecies) is found in the coastal low hills in China's central and lower reaches of the Yangtze River. Scattered in China 4 Chuan, Yunnan Province at an altitude of 400 (1) 000 m, also scattered at 2400 m, inhabiting the irrigation ditch or hillside grassy beach.