Yes. There are several species of parasitic flatworms.
The phylum with the most species that parasitize humans is Platyhelminthes, specifically the class Trematoda (flukes) and the class Cestoda (tapeworms). These parasites can cause diseases such as schistosomiasis and cysticercosis in humans.
Platyhelminthes, or flatworms, play several important roles in the ecosystem. They are decomposers, breaking down dead organic matter and recycling nutrients back into the environment. Some flatworm species are also parasites, which can have impacts on the populations of their hosts. Flatworms also serve as food for other organisms in the ecosystem.
Muhammad Sharif Bhutta has written: 'Digenetic trematodes of vertebrates from Pakistan' -- subject(s): Parasites, Platyhelminthes, Trematoda, Vertebrates
Platyhelminthes
platyhelminthes
The scientific name for flatworm is Platyhelminthes.
Flatworms are in the Platyhelminthes Phylum
these live as endoparasites in human e.g taenia{tapeworm},Fasciola{liver fluke}.These two parasites have two hosts.Planaria is a free living specie.
Marine Flatworms are in the Platyhelminthes phylum
platyhelminthes
The marine flatworm belongs to the Phylum Platyhelminthes.
If you mean parasitic flatworms, they belong to the phylum Platyhelminthes.