Completely equal because of the size of bivalves has named the two shells, two symmetrical shells, each shell no symmetry plane. So be different and brachio-pods. Bivalves are invertebrates living one of the most widely used category, about 20,000 kinds, widely distributed from the equator to the poles, from the intertidal zone to 5800 m deep sea, from brackish to fresh water lake sea are distributed, the times of their lives: First appeared in the early Cambrian, in history, four prosperous period: O (Ordovician) __S (Silurian) early. D (Devonian) of fresh water type occurs, the sea of students continue to thrive.. To replace the Mesozoic period, the replacement of marine brachio-pods status. Eocene to the modern, class-based heyday. The living environment: Live in water most of the seafood, a few in fresh water, very few parasitic (internal send clam ntovalva, love clam Peregrinamor, etc.), mainly living benthic crawling or fixation to algae or plankton. General movement is slow, some potential home sediment, some that live by, and some stone quarry or chisel wood pastures, small business parasitic life.
Most edible, such as clam, oyster, clam, river clams, clams, etc.; some only eat their adductor muscle, such as scallop adductor dried scallop, said Jiang Yao said dried scallop adductor muscle. Many types of shells can be used as medicine, and some can be pearl, such as fresh water production cumingii, pearl shell and other seafood. Some of the industrial raw materials, and some can be used for fertilizer, lime and so on.
Main Features
Shells and a pair of generally symmetrical, there are asymmetric (ranging from clams and oysters Ostrea Anomia, etc.). Shell form an important basis for the classification, especially prominent in the central part of shell, slightly tilted to the front, called the shell top (umbo), which is the oldest part of the shell. Top location in the shell, the shell of the front. The opposite end to the rear. To shell top for the center, arranged in concentric circular growth lines, some species are from the top shell with radiation to the ventral edge of the rib or groove. Top shell of a small depression, often in front of said face-catching colors, the top shell to shield the post, the back edge of the shell thick, often in the teeth and alveolar here, around the tooth and alveolar shell coincide with each other to form strands Department (hinge). Stranded tooth number and arrangement of mixed species for the identification of the main features of bivalve. Stranded on the shell top gear mainly Chiang teeth, said his front teeth before the tooth, followed by posterior teeth. Department of links in the two strands back edge of the shell with a horny, and a flexible ligament (ligament), its role in bringing the two shells open. From the dorsal to the ventral shell of its height, its length from front to back, its widest point is about the width of the two shells.
Some species (mussels, cockles, scallops, etc.) in the belly of line later on foot office with a hole, known as the full wire holes, less learned person nematocysts, the secretions of the epithelial cells in contact with water that hardens into a shell pigment filaments, assembled in full thread (byssus), for the fixation of foreign material.
I was up and down two lips of the transverse joint, lip mostly triangular, with cilia, can be fed. The crystalline Gastrointestinal rod (crystalline style), slender rod. Stomach with gastric shield (gastric shield), the role of the protection of the stomach.
Gills in the original species (Wan Kam clam Nucula) for the shield; others are filamentous or valvular; some gill flap healing each other, and degradation, forming a hole in the diaphragm, as every other gill (hole mantis class Poromyacea), no longer respiration.
Room 2 eyes of the heart is bent structure, open tube cycle; excretory organ is a kidney; ganglion to the brain, feet, dirty three pairs (Wan Kam clams there ganglia), sensory-developed, most dioecious, a small number of hermaphroditism (oysters), occurred in individuals trochophore and ve-liger larvae of freshwater mussel glochidia are unique.
Most edible, such as clam, oyster, clam, river clams, clams, etc.; some only eat their adductor muscle, such as scallop adductor dried scallop, said Jiang Yao said dried scallop adductor muscle. Many types of shells can be used as medicine, and some can be pearl, such as fresh water production cumingii, pearl shell and other seafood. Some of the industrial raw materials, and some can be used for fertilizer, lime and so on.
Main Features
Shells and a pair of generally symmetrical, there are asymmetric (ranging from clams and oysters Ostrea Anomia, etc.). Shell form an important basis for the classification, especially prominent in the central part of shell, slightly tilted to the front, called the shell top (umbo), which is the oldest part of the shell. Top location in the shell, the shell of the front. The opposite end to the rear. To shell top for the center, arranged in concentric circular growth lines, some species are from the top shell with radiation to the ventral edge of the rib or groove. Top shell of a small depression, often in front of said face-catching colors, the top shell to shield the post, the back edge of the shell thick, often in the teeth and alveolar here, around the tooth and alveolar shell coincide with each other to form strands Department (hinge). Stranded tooth number and arrangement of mixed species for the identification of the main features of bivalve. Stranded on the shell top gear mainly Chiang teeth, said his front teeth before the tooth, followed by posterior teeth. Department of links in the two strands back edge of the shell with a horny, and a flexible ligament (ligament), its role in bringing the two shells open. From the dorsal to the ventral shell of its height, its length from front to back, its widest point is about the width of the two shells.
Some species (mussels, cockles, scallops, etc.) in the belly of line later on foot office with a hole, known as the full wire holes, less learned person nematocysts, the secretions of the epithelial cells in contact with water that hardens into a shell pigment filaments, assembled in full thread (byssus), for the fixation of foreign material.
I was up and down two lips of the transverse joint, lip mostly triangular, with cilia, can be fed. The crystalline Gastrointestinal rod (crystalline style), slender rod. Stomach with gastric shield (gastric shield), the role of the protection of the stomach.
Gills in the original species (Wan Kam clam Nucula) for the shield; others are filamentous or valvular; some gill flap healing each other, and degradation, forming a hole in the diaphragm, as every other gill (hole mantis class Poromyacea), no longer respiration.
Room 2 eyes of the heart is bent structure, open tube cycle; excretory organ is a kidney; ganglion to the brain, feet, dirty three pairs (Wan Kam clams there ganglia), sensory-developed, most dioecious, a small number of hermaphroditism (oysters), occurred in individuals trochophore and ve-liger larvae of freshwater mussel glochidia are unique.