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Some species can form both male and female sex cells that is, they are omnipresent. The reproductive biology of combs varies from species to species. Food particles are selected and swallowed by the fluffy and ciliated formations called lips. Food particles are attached to the anterior surface of the gill fibers From here, it is transferred to the feeding grooves that open to the mouth via the anterior cilia. As a result, the entire gill appears V-shaped. The fibers are very long and curled in a U shape. They are composed of many gill fibers located around an axis. The gills are slender organs located on both sides of the foot and fill most of the mantle cavity. Like other bivalves, combs feed by filtering food particles in the water stream provided by the cilia on the gill fibers. But behind the retina are multilayered guanine crystals these crystals completely cover the posterior part of the eye and reflect the image back to the retinal cells. is far away therefore the animal cannot perceive a clear image. The focal point of the lens is 1.2 mm from the center of the lens. Although the eye has a lens, the image retina falls to a point far behind the eyes. The retina at the back of the eye regulates the orienting movement. Cells in the outer retina only respond to light changes. Each eye has a lens and a retina consisting of two different layers of the eye. In addition to these tentacles, there are irregularly arranged eye points, which are half the number of grooves on the shell.Įyes, which have a very complex structure, have the power to detect the smallest light changes in the environment. The mantle circle has thread tentacles that can be moved in and out. There are glands in this mantle that allow new crusts to form. The inner ligament resists contraction of the proximal muscle. Closure is provided by the proximal muscle. Inside the shell, at the joint, there is another wedge-shaped ligament that is compressed when the valves are closed. The caps are connected posteriorly by a flexible ligament at the joint area. As with the other bivalves, the tissues of the comb are protected by calcareous flaps on both sides.
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The body shape is generally the same in all combs. In pectenes, the left cover is convex and the right cover is flat. All species of the genus Chlamys can be easily distinguished from species of the genus Pecten. The other scallops are Chlamys islandicus off the coasts of northern Europe and North America, Chlamys nodosus off the southeastern coast of the USA and the Caribbean Sea, and some species native to subtropical regions. The most common of the species in Europe is the queen comb (Chlamys opercularis). The best known are the tiger comb (Chlamys tigerina), the humpback comb (Chlamys distorta) and the multicolored comb (Chlamys varia). One of the most common breeds of combs is the genus Chlamys. This species is found on the Atlantic coasts of Europe. The best known type of comb is the large comb (Pecten maximus). Since their general appearance resembles a Roman comb, their main breed is named with the word Pecten, which means comb in Latin. There are about 300 species spread all over the world. A general name given to some two-lidded mollusks from the flat-gill class.