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feature of paylum Platyhelmintis.
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Biology > Animal Kingdom > Phylum Platyhelminthes
Animal Kingdom
Phylum Platyhelminthes
Did you know, potentially life-endangering parasites can live in the human body for up to several decades? Moreover, these parasites, known as blood flukes, have the ability to regenerate themselves. And so, can survive in hostile environments. Furthermore, these worms belong to Phylum Platyhelminthes. Let us explore this phylum.
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Phylum Platyhelminthes
Platyhelminthes - Bedfords Flatworm
(Source: Wikipedia)
Platyhelminthes are commonly known as flatworms or tapeworms. They are a group of soft-bodied invertebrate animals. As a matter of fact, there are around 20,000 species of these animals. A few of these live as parasites on humans and other animals. Furthermore, it is because of this parasitic nature that they do cause some amount of trouble for the host animal. A few species belonging to this phylum can be a major cause of certain diseases. For example, Schistosomiasis, or bilharzia or bilharziasis, is a disease caused by these parasitic flatworms. They belong to the family Schistosomatidae.
The most distinguishing feature of these invertebrates is their flat body. As the body does not have any cavity, they are flat. The body is also not segmented and they do not have specialized systems. Around eighty percent of the flatworms are parasitic in nature, while a few free-form flatworms are also present. The free-living forms are scavengers or predators. The parasitic species feed on the tissues of the host organism in which they live.
The animals in this phylum have a diverse range in size. Some are microscopic, while a few go up to two feet long. They are also hermaphrodites, which mean that both the sexes are present in the same organism.
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Some defining features of the phylum are that flatworms are acoelomate (they have no body cavity), triploblastic (the body has three tissue layers), and bilaterally symmetric (they have symmetric right and left sides and usually a definite head) and so on.