Nematodes and Platyhelminthes are generally more common than round and flat worms (or tapeworms) refers. There are over 16,000 species of parasitic nematodes, while more than half of the 12,000-plus species and parasitic Platyhelminthes. The major differences between the nematodes and Platyhelminthes are their shapes (round over flat) and how to handle them, what they are taking. Roundworms an actual digestive system, while flatworms have only a generalized intestinal digestion.
Nematode digestive system are as many types of worms. They pass through an opening at one end through which nutrients and an opening at the other end, where waste is discharged. They are also slim and are usually less than 1/10 inch long. Many are so small you need a microscope to see them, others may be more than 2 inches long. Nematode heads are large and distinctive.
Platyhelminthes, unlike nematodes do not actually have a digestive system. Rather, they take in nutrients and oxygen through their flattened bodies and then vomit waste by mouth organs, but some have to do anus. Most have no special respiratory or circulatory system, also unlike nematodes. Moreover, they are bilateral, ie. Identical right and left sides, while nematodes are rounded, in particular, with no side
Nematodes come as male and female and reproduce sexually, while Platyhelminthes be hermaphoditic tend. That is, they have the ability to reproduce without having sex with other benefits Platyhelminthes. While roundworms tend widespread nervous system, have all flatworm species systems, which are concentrated at their bedsides. Platyhelminthes tend to concentrate in aqueous or moist environments found during nematodes inhabit any environment, wet or dry, are in the world.
Both nematodes and Platyhelminthes are parasites of humans and can cause a number of serious diseases. In severe parasitic attacks, both can even lead to death if they infect their hosts in sufficient numbers common nematode infections include those of hookworms and pinworms and can cause trichinosis trichinosis. Humans eating raw or undercooked pork products can contract the worm via this route. Schistosome Platyhelminthes be to cause potentially fatal schistosomatic fever known.