Flatworms, also known as flatworms, are a type of invertebrate animal.
Traditionally, flatworms have been included together with nematodes, within a group called "worms". They have simple organs and no apparatus.
The main characteristics of flatworms are:
- They have a flattened body, which is why they are also called "flat worms", although the term worm does not correspond to any taxonomic category.
- They have no skeleton, neither internal nor external.
- They do not have locomotor appendages.
- The alimentary canal does not have an anus, and acts as a digestive cavity. That is, it performs digestion and distributes nutrients, since they do not have a circulatory system either.
- Some flatworms are free-living, but others are parasites, such as tapeworms or tapeworms that parasitize the intestines of humans and other animals.
- Most are hermaphrodites.
The two best-known groups of flatworms are:
They are intestinal parasites, also of humans. In the front they have the scolex, a structure that allows them to attach to the wall of the intestine of the animal they are parasitizing. They do not have a mouth, but directly absorb nutrients from the intestine.
Video: Solitary or tapeworm.