Platyhelminthes (from Ancient Greek πλατύ platy 'flat' and ἕλμινς helmins 'parasitic worm') [4] is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called …

Oct 29, 2025 · Flatworm, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. Several species are free-living, but about 80 percent are parasitic.

Aug 3, 2023 · Platyhelminthes definition. Platyhelminthes characteristics and Classification. Class 1- Turbellaria. Class 2- Trematoda. Class 3- Cestoda.

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 …

Phylum Platyhelminthes is composed of the flatworms: acoelomate organisms that include many free-living and parasitic forms. Most of the flatworms are classified in the superphylum Lophotrochozoa, …

Platyhelminths have practically no fossil record. A few trace fossils have been reported that were probably made by platyhelminths (Alessandrello et al., 1988), and fossil trematode eggs have been …

Phylum Platyhelminthes belongs to kingdom Animalia. This phylum includes 13,000 species. The organisms are also known as flatworms. These are acoelomates and they include many free-living …

Jul 9, 2002 · Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. Some forms are free living but many are parasitic.

Jul 23, 2025 · Phylum Platyhelminthes is a phylum of invertebrates that consists of organisms that are bilaterally symmetrical and unsegmented. Usually, species in this phylum are known as flatworms or …

In Summary: Phylum Platyhelminthes Flatworms are acoelomate, triploblastic animals. They lack circulatory and respiratory systems, and have a rudimentary excretory system. This digestive system …