MESOGASTROPODA (Mesogastropoda) door molluscs (Mollusca), gastropods (Gastropoda), before Gill subclass (Prosobranchia) of a project. The heads didyma Branch (Naticidae), snail Branch (Viviparidae) in some species can be eaten; baby Branch (Cypraeidae), didyma Branch, Division spiral staircase (Scalariidae) Many species are collected by people like enjoying the product. Many freshwater species, such as snails genus (Oncomelania), beans snail genus (Bithynia), is the intermediate host of human and animal parasites.
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Species distribution
The project includes an extremely wide variety, marine, freshwater and terrestrial species have. There shore marine snails Branch (Littorinidae), Cerithium Branch (Cerithidae), Phoenix Lo Branch (Strombidae), Crown Lo Branch (Cassidae), didyma Branch, baby subjects such as freshwater snail families are black spiral Branch ( Melanidae), round mouth screw Branch (Cyclophoridae) and so on. Iso-foot suborder (Heteropoda) is a widely distributed marine taxa planktonic life. The head of animal fossils found in the Ordovician to modern strata, mainly seen in the Mesozoic. Fossil species are common, didyma (Natica), conch (Strombus), cowries (Cypraea), escargot (Viviparus), tower Lo (Turritella), Kinugasa Lo (Xenophora) and crab keep snails (Cerithium) and so on.
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Morphology
The project developed an animal shells, many species have pre-ditch, but water pipes underdeveloped. Changes in the shape and pattern of large shells. Generally operculum. Shell mouth mostly full mouth style. Sometimes there are front and rear ditch, the ditch is not tubular front. No nacre. Flap mostly horny. Nervous system more focused, with a clear osphradium, most species have a balancer in the Han otolith. Gill 1, showing pectinate, a side that has gill gill filaments. 1 heart ventricles and two atrial appendage, not through the rectum. Genital opening alone, without a kidney hole discharge. Radula for the New York-based tongue, tooth 2.1 · 1.1.2.
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Main Branch
1: snail Branch: large body, the body is divided into head, foot, visceral sac, mantle and shell of five parts. Shell height up to 70 mm or more, a small species of shell height can reach 30 mm. Conical shape, conical or gyro-shaped tower. Shell surface smooth or snail edge, ribbons, spine-like or papillae. Operculum is horny flakes. Obviously the head, each of the back side of the head of a needle tip of the tentacles. Eye on the students in the base of the antennae short handle, you can see the general 20-30 cm away. Head between the two antennae, there is a cylindrical protrusion extending toward the front, which is its snout. Kiss front ventral opening its mouth is. Tongue in the mouth with teeth arranged above the small teeth, tongue, teeth scraping food use. Rookeries freshwater snails, group habitat in rivers, lakes, ponds and paddy fields. With large gastropods creeping or crawling on the plants at the bottom. Strong adaptability to the environment, with drought, cold resistance ability of oxygen. Dioecious. Right male antennae thicker, forming a copulatory organ. Ovoviviparous vivo fertilization and development. Aberdeen snails grow into later, after another excreted live freely in the water business. 2, Jade Lo Branch: nearly spherical shell, shell height 27.1 mm, width of 22.1 mm shells, snails layer of about 6 layers. Spiral part elevated, accounting shell height of 1/3, compared with swollen body whorl, smooth without ribs, growth lines fine. Shell yellowish white, covered with purple-brown spots. Base white, purple shell top. Shell oval mouth, the pale. Curved outer lip, the lip forms a central nodule. Umbilical not very large, the lower half is a few nodules coverage. Operculum horny. Daini intertidal habitat in the sandy beach, see the kinds of learning for our coast. 3, Baby Section: shells, mostly ovoid, adult spiral portions are small, usually buried enamel, the entire shell of the body whorl possession. Shell surface light such as porcelain, with a variety of colors, patterns or spots, very beautiful. Shell narrow mouth, is located near the middle of the ventral surface. There are two different lengths of the lip or tooth colored. No operculum. Between deep-sea habitat in the intertidal zone to, but more shallow water species. When the head and feet stretched out activities outside the shell to the mast foot crawling on the seabed. Meanwhile mantle extends from the mouth of the shell to the back to start the shell completely enclosed. Many on growth projections, and a variety of colors, very beautiful. Multi night out activities to coral, foraminifera and small crustaceans for food. Dioecious, spawning more in the summer, has been prostrate on the egg masses, just leave upon hatching. China has more than 60 kinds have been found along the coast, the common stock shellfish (Mone-taria moneta), A Man ribbon shellfish (Mau-rifia arabica) and a tabby baby (Cypraea tigris). Edible meat. Shells for viewing, but also for medicinal purposes. Once used as currency in ancient treasure. 4, Bin Lo Branch: Shell small, oval or spherical surface is rough, the color is not bright, with a spiral rib or granular protrusions. Shell opening round, full, operculum horny, brown, thin. Bin snails living in the intertidal zone of high tide, and mangrove leaves on the base or on the tidal waves could hit the rocks. Each sea are distributed, but narrow range. In the study of intertidal ecology, and often it as a sign of division zone or layer. 5, Crown Lo Branch: Shell over the expansion, oval or triangular oval. Spiral part is low, swollen body whorl. The whorl swollen veins often vertical, thin shell surface smooth or with spiral grooves, as well as red-brown nodules protruding plaque or pattern. Tropical and temperate species are all common types of seafood. Living in the vicinity of the low tide line to 300 meters deep seabed sand or sediment quality. China's coastal areas can be taken to have recorded about 16 species of snails Paracel Tang crown. Shells and shell carving for ornamental use, meat edible. Also widely distributed in the Pacific and Indian oceans warm area.
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Wikipedia Encyclopedia
zhongfuzu mu MESOGASTROPODA Mesogastropoda Gill subclass of an eye. Marine, freshwater and terrestrial species have. Shell developed, there are many types of pre-ditch, but water pipes underdeveloped. Changes in the shape and pattern of large shells. Generally operculum. Nervous system more focused, with a clear osphradium, most species, only one otolith balancer. Gill 1, showing pectinate, a side that has gill gill filaments. 1 heart ventricles and two atrial appendage, not through the rectum. Genital opening alone, without a kidney hole discharge. Radula for the New York-based tongue, teeth formula 2 □ 1 □ 1 □ 1 □ 2. The project includes an extremely wide variety, marine foreshore Lo Branch, Cerithium Branch (Cerithidae), Strombus Branch (Strombidae), crown Lo Branch, didyma Branch (Nati-cidae), baby subjects such as; freshwater are snail Branch, black spiral Branch (Melanidae), round mouth screw Branch (Cyclophoridae) and so on. Didyma Branch, Division of snail some species are edible; baby Branch, Division didyma, spiral staircase Branch (Scalariidae) Many species are collected by people like enjoying the product. Many freshwater species, such as snails genus, genus, such as beans, snails, the intermediate host is a human and animal parasites. Iso-foot suborder (Heteropoda) is a widely distributed marine taxa planktonic life. (Qi Zhong Yan)
Littorinidae