Platyhelminthes (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") [4] is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms.

Feb 18, 2025 · 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.

Dec 8, 2020 · Flatworms are a diverse group of animals in the phylum Platyhelminthes. Although most are fully aquatic, there are many species that exist on land in moist, terrestrial habitats, particularly those in the family Geoplanidae.

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.

Flatworms (Platyhelminthes) are a group of bilaterally symmetrical, acoelomate, soft-bodied invertebrate animals found in marine, freshwater as well as moist terrestrial environments.

Flatworms are the simplest of the worm groups. There are about 20,000 species in this group. Flatworms are found many places and can be free living or parasitic. A parasite lives off another living thing called a host and can be harmful. One of the best known flatworms is the tapeworm.

Feb 6, 2025 · 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.

Platyhelminthes are also known as flatworms, belonging to the kingdom Animalia. These are triploblastic, acoelomate, dorsoventrally flattened, and bilaterally symmetrical organisms, found as free-living, or in the body of a host.

Flatworm species are divided into three classes: Turbellaria, Trematoda and Cestoda. All flatworms, according to Cool Galapagos, are hermaphroditic, soft-bodied worms with rudimentary nervous systems, no respiratory or circulatory systems and …

Flatworms have bilaterally-symmetrical flat bodies. They are ribbon-shaped and are flattened dorsoventrally. There are four major classes of flatworms such as Cestoda (tapeworms), Turbellaria (planarians), Trematoda (flukes), and Monogenea.