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Polyplacophora (kitonlar)

Polyplacophora refers to carrying a large number of plates. They are oval-shaped, bilateral cerebral animals with a shell of eight back plates lined with art. The front has the annulus in the posterior. The Sölom has been reduced to a small void surrounding the heart. Kitons live a quiet life almost without motion. They move by crawling on the surface of shallow waters and are fed with algae particles, which are called horns, with radial teeth. They can bring flat and wide feet to a very powerful moment, and when they are disturbed they are so strongly clamped on the rocks that they can hardly be removed from where they are.


Members of this class have been known as fossils since long, and it was thought that this class was extinct 350 million years ago. However, in 1952, ten live specimens (belonging to the genus Neopilina) were found in the mud taken from a deep pit on the Costa Rica coasts of the Pacific Ocean.
These examples have started very heated debates over the origin of the mollusk. Because the specimens had some kind of internal segmentation, a feature not seen on any other member of the branch. Because it is known that the larva type of the mollusk and the first segmentation model show a striking resemblance to the corresponding developmental stages of the ringworm (Annelida branch), Neopilina segmentation resulted in the conclusion that many biological ancestral molluscs are segmented animals, possibly primitive ringworms.
However, many other biologists believe that the segmented structure of Neopilina is secondary rather than the first, and that the original molluscic body is not. Whichever view is correct, it is clear that there is a close kinship relationship between the soft player and the ringworm.

Gastropoda (snails and relatives)

Most of the members of the gastropoda have a curled skin. However, in some cases, curl is the minimum. Some species belonging to Aplysia and the other members of Nudibranchia have lost their shells in the adult period. Larva in Gastropoda, bilateral symmetry in early periods; but as the larva develops, the anus is bent down and forward with the digestive tract until it comes near the mouth. The entire inner mass then rotates at an angle of 180 ° to the dorsal side of the head located at the anterior part of the body. Most of the internal organs on this side (usually on the left side) are blunted and growth continues asymmetrically and characteristic stranding occurs.
The essence of your bodies
Gastropoda members are thought to show similarity to ancestral molluscs, except that they are twisted and twisted by hand. They have a separate head with very well-developed sense organs. Most have strong radials and are fed by biting plant or animal tissues. Gastropoda members glue their food with these organs, brushes or lightly brush. Gastropoda species are found in a wide variety of habitats. The vast majority live in seas; their mostly large and ornate shells are among the most precious finds found on the beaches. However, there are also a number of freshwater species, some of which live on land. The land snails are among the few invertebrate groups of animals that have been fully adapted to terrestrial life. In the majority of these gills have disappeared; but the mantle void has become very vascular and has begun to function as a lung. Such snails are called lung snails. Some lung snails later turn into secondary water and have to come to the surface of the water periodically to get air.

Scaphopoda (ivory crustaceans)

Scaphopoda members have a long tubular tube that is open at both ends. The shell is generally smaller than the other one and thus has a shell, ivory or tooth-like appearance. Ivory crustaceans are all marine and live in sand or mud piercing. Live animals are seen as the cause; but the shells of the dead can sometimes be found in beaches.

Bivalvia (midyeler)

The term "bivalv" indicates that these animals have come from two parts of the shark. These two parts or valves are generally similar in shape and size and are hinged together on the one side (the dorsal side of the animal). The animal opens and closes these valves through the large muscles. Common members of Bivalvia include lizards, ostriches, seabirds, combs, filials, and eclipses. In the adult period, the majority prefer to live permanently in one place, but the seafloor sometimes swims by opening and closing their shells quickly.
Bivalvia members are usually fed with the filtrate because they have no radii. They are fed by very small food particles that are filtered from the water flowing on the gills.

Cephalopoda (cuttlefish, octopus and relatives)

Most members of Cephalopoda show little resemblance to other softbodies. Unlike their relatives who are living on the ground, cadavers are specialized to kill and eat big prey, especially crabs and fish, for fast pace and predator lifestyles.
Fossil heads usually have very large shells; but the shell is either greatly reduced or totally lost in the majority of today's living forms. (Nautilus is a well-developed shell with an ornithine shell and is a living form and an exception to the present day.) The body is thin-long and has a well-developed and very large head around the long tentacles.
Some species can reach a size of several meters.
The giant cuttlefish (Architeuthis) living in Northern Alantic is the largest living invertebrate animal; the largest individual recorded is 17 m. (including tentacles) and weight about 2 freeze. The octopuses have never reached this size.
Cranberries have many similarities, most notably arthropods, which appear as convergence endings with vertebrates. For example, the inner cartilage that ink fish possesses is analogous to the skeleton of the vertebrates, and has a brain box that has come to the point of a cartilage from a skull. They also have a well-developed nervous system in which a large, complex brain is located. What is perhaps most striking about all the similarities of ink fish to the vertebrates is that they have a fairly large camera-type eye that is exactly the same as ours.
Source: poxox.com learn

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