Feeding roundworms. General characteristics of roundworms

In this article, we will introduce you to roundworms, which, unlike flat ones, have a body cavity. This species has a cavity between the wall of the body and the intestine.

Type round worms. Classes

Round worms differ bilateral symmetry and are invertebrates. Now there are more than thirty thousand species that form four classes:

• Hairy;
• Intestines;
• Nematodes;
• Rotifers.

Round worms are spread everywhere, throughout the globe, and very often they can be seen as parasites in animals, plants and humans. Now let's take a closer look at each class of roundworms.

Hair loss

This class of roundworms is distinguished by the fact that the larvae lead an exclusively parasitic life. Such a name they got because of the hairy body. They have a color from white to brown. The length of the body is up to forty centimeters, while the thickness does not exceed five millimeters. Note that females in length have a larger body than males.

The nutrition of roundworms of this class is characteristic of the fact that adults can not swallow food at all. Their throat is a bundle of cells.

A full cycle of development of a hairy woman takes eighteen months. Adult individuals (females) lay to one million eggs, of which larvae leave within a month. Their main goal is to get into the host's body, where they can penetrate even with food. If the owner does not fit, then the worm waits until its master is eaten by another predator.

When the owner is "approved", the hairy hair grows violently. If the worm has reached the peak of its development, then it leaves the body (drilling the host's body), while, as a rule, the owner dies.

Stomach Groat

These are very small representatives of this type. The body of round worms of the intestines is only one and a half millimeters in length. Now more than two hundred representatives of this class are known. They move with the help of cilia, which sometimes form whole bunches, located on an elongated or bottle-shaped body. In order to be able to temporarily attach to the substrate, there are tubes on the body (at the back end). The whole surface of the body, including the cilia, is covered with a cuticle forming on the upper part of the scales. The primary cavity of a roundworm of this class, such as the belly-harlequin, is very weakly expressed.

The mouth is at the anterior end of the body. Feeding roundworms of this class is carried out with the help of bacteria. The pharynx works like a pump, the cilia create a water current that is directed into the mouth.

As for reproduction, along with the dioecious forms there are also hermaphrodites. Fertilization is internal, the genital organs lie in front of the anal opening.

Nematodes

This class leads to a free and parasitic lifestyle. The variety of roundworms (nematodes) is more than a million species. Free-living live both on land and in water, with one million cubic meters of them numbering more than a million individuals. These species play a very large, significant role in ecosystems. But many representatives of this class lead a parasitic life, causing diseases of plants and animals, including humans. Nutrition of roundworms (nematodes) is limited to algae and bacteria, in the case of a parasitic lifestyle - food at the expense of the host.

In plants, parasites cause damage to stems, roots, fruits, leaves, and in humans - various types of invasive diseases. The most common in humans are:

• Ascarids;
• Pinworms;
• Trichinella;
• Hookworms;
• Rishta and so on.

Treatment consists in getting rid of, parasite data from the body of the host by various methods.

Nematodes in humans

Let's start with how roundworms can get into the human body. First, this food: round worms there is a great many, and if you do not comply with the rules of hygiene, then via dirty food or water, these parasites enter our body. It is also possible to infect through an insect bite or through the skin. The most dangerous insect, most likely to be awarded by worms, is a mosquito. And through the skin, parasites enter, if there is an open contact of the earth and blood (for example, with a cut).

How to understand that you have parasites? Primary symptoms are itching in the anus, wandering pain, disturbance of stool and appetite, vomiting is possible. At the initial stage it is necessary to get rid of superfluous visitors who can in the further very seriously be reflected in your health.

Rotifers

Let's move on to the last class of roundworms. To a greater extent this class leads a free life in fresh water bodies, but they are found in the seas and in moist soil. Despite the fact that most lead a free way of life, there are parasites. A special feature of the structure of rotifers is the presence of the feet and fingers. It is a muscular growth of the body, which helps to move.

As for development, in favorable conditions only female individuals are observed in the population, which by means of parthenogenesis only produce such females. As soon as there is a threat (for example, the drying up of water bodies or freezing), males come to the aid, with the help of which females can lay winter eggs.
It is surprising that female individuals can do without tens of millions of years without sexual reproduction.