They can measure several centimeters and have suction cups to fix on the host. Trematodes: they are found in animals and some species can affect man.They are hermaphrodites with crossed reproduction. Monogenous: they are mainly parasitic species of amphibians and fish.They move through cilia and live in the sea, although some have adapted to fresh water and land. Turbellarians: they are also known as planarians and have an autonomous life.We can mention four different types of flatworms, which are: They can be found mainly in rainy, marine and terrestrial environments that are humid.They breathe into their integument and the gases diffuse directly through their humid outer surface, which is known as integumentary exchange.Flatworms do not have a true circulatory or respiratory system, but like all other animals, flatworms consume oxygen.The organ systems are formed from three germinal layers: an external ectoderm and an internal endoderm, with a mesoderm between them.They are the simplest and most organ-bearing animals of the triploblastic group.The soft body of a flat worm is ribbon-shaped, flattened on the back and bilaterally symmetrical.
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