Instead, they have what are called ‘Protonephridial excretory organs’.įlatworms reproduce as hermaphrodites. Flatworms possess a ‘blind gut’, they have a mouth but no opening at the lower end of the alimentary canal through which solid waste is eliminated from the body. Their bodies have 3 layers of tissues with organs and organelles however, they contain no internal cavity. Flat Worm Characteristicsįlatworms are bilaterally symmetrical and dorsoventrally flattened meaning ‘they look like a ribbon’. The tapeworm then eats off the host and is dangerous to the host as it grows and consumes more of the host and its food. The tapeworm can get into a persons digestive tract and grow to enormous lengths. One of the best known flatworms is the tapeworm. A parasite lives off another living thing called a host and can be harmful. Flatworms are found many places and can be free living or parasitic. There are about 20,000 species in this group. Image Source Flat Worms (Phylum Platyhelminthes)įlatworms are the simplest of the worm groups.
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