![]() ![]() ![]() The excretory system has protonephridia with the flame. In fact, the respiration generally occurs by simple diffusion through the body surface. Respiratory and circulatory systems are absent.In a few species, the digestive system is completely absent. In fact, there is a single opening which leads to a well-developed gastro-vascular cavity. The digestive system is incomplete or absent.They exhibit an organ system grade of organization.They are mostly parasitic with a few free-living.They do not have a body cavity and are acoelomate.Also, they are triploblastic, with three germ layers.Their body is dorsoventrally flattened.Browse more Topics under the Animal KingdomÄownload Animal Kingdom Cheat Sheet BelowĬharacteristic features of Phylum Platyhelminthes They are also hermaphrodites, which mean that both the sexes are present in the same organism. Some are microscopic, while a few go up to two feet long. The animals in this phylum have a diverse range in size. The parasitic species feed on the tissues of the host organism in which they live. The free-living forms are scavengers or predators. Around eighty percent of the flatworms are parasitic in nature, while a few free-form flatworms are also present. The body is also not segmented and they do not have specialized systems. As the body does not have any cavity, they are flat. The most distinguishing feature of these invertebrates is their flat body. ![]() They belong to the family Schistosomatidae. For example, Schistosomiasis, or bilharzia or bilharziasis, is a disease caused by these parasitic flatworms. A few species belonging to this phylum can be a major cause of certain diseases. Furthermore, it is because of this parasitic nature that they do cause some amount of trouble for the host animal. A few of these live as parasites on humans and other animals. As a matter of fact, there are around 20,000 species of these animals. They are a group of soft-bodied invertebrate animals. Platyhelminthes are commonly known as flatworms or tapeworms. ![]()
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