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flatworm, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it.
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") [4] are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Flatworms are found in marine and fresh water. Flatworms are not related to sea slugs or other molluscs. Although very thin and delicate, flatworms are active carnivores and scavengers, using their proboscis to feed on dead or injured animals and colonial animals such as bryozoans and soft-corals.
Flatworms. Flatworms belong to the phylum Platyhelminthes. Examples of flatworms are shown in Figure below. There are more than 25,000 species in the flatworm phylum. Platyhelminthes. Platyhelminthes include flatworms, tapeworms, and flukes.
Platyhelminthes, or flatworms, are a phylum of simple, bilaterally symmetrical invertebrates with a dorsoventrally flattened body. They lack specialized respiratory and circulatory systems and include both free-living species, like planarians, and parasitic species, such as tapeworms and flukes.
flatworm, or platyhelminth, Any of a phylum (Platyhelminthes) of soft-bodied, usually much-flattened worms, including both free-living and parasitic species. Flatworms live in a variety of marine, freshwater, and terrestrial habitats worldwide.
Discover what flatworms are and learn their unique characteristics. Explore different examples of flatworms and if they are parasitic and harmful to humans. Updated: 11/21/2023