Nematoda |
Nematoda phylum is made up of organisms that are commonly known as roundworms. Nematoda are worm-like organisms that are surrounded by flexible and strong living tissue. There are over 25,000 known species in this phylum, and over half of them are parasitic. The nematodes have very simple flat bodies and are found in almost any type of environment.
The nematodes do not have an ordinary circulatory system, they transfer oxygen and the nutrients they need to themselves through diffusion. Due to the fact that there is no circulatory system in this phylum, some species that are apart of it obtain something called a pseudocoelom, which is something that is located in the body cavity and it is filled with large amounts of fluids and it transports the important nutrients the organism needs such oxygen. In addition, the metabolic waste that is made is excreted through two ducts in the species.
The nematodes do not have an ordinary circulatory system, they transfer oxygen and the nutrients they need to themselves through diffusion. Due to the fact that there is no circulatory system in this phylum, some species that are apart of it obtain something called a pseudocoelom, which is something that is located in the body cavity and it is filled with large amounts of fluids and it transports the important nutrients the organism needs such oxygen. In addition, the metabolic waste that is made is excreted through two ducts in the species.