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www.answers.com/Q/What_are_the_four_major_classes_of_phylum_platyhelminthes

Platyhelminthes contain 20,000 species of soft-bodied, bilaterally symmetrical, invertebrate animals and are commonly called flatworms. There are four classes: Turbellaria, and Trematoda, Cestoda ...

hubpages.com/education/Classes-of-platyhelminthes

Platyhelminthes or flatworms are dorsoventrally flattened bilaterally symmetrical tripoblastic but acoelomate animals which have a blind sac body plan.There are about 13,000 species, most of which are parasitic, a few commensal or free living. The free living forms occur in both fresh water and marine habitats.

www.encyclopedia.com/.../animals/zoology-invertebrates/platyhelminthes

Almost all Platyhelminthes are aquatic, both fresh water and marine, but a few terrestrial species live in moist, warm areas. Species vary in size from microscopic to over 60 feet (20 meters) long for some tapeworms. There are four major classes of Platyhelminthes and over twenty-five thousand species.

biologywise.com/characteristics-of-platyhelminthes

Phylum Platyhelminthes comprises 34,000 known species which are categorized under four classes: Turbellaria, Monogea, Trematoda, and Cestoda. Class Turbellaria comprises flatworms that are ciliated and free living, whereas members of class monogea are ectoparasitic (live outside the host body) and constitute monogenetic flukes.

bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book:_General...

Platyhelminthes are traditionally divided into four classes: Turbellaria, Monogenea, Trematoda, and Cestoda. The class Turbellaria includes mainly free-living, marine species, although some species live in freshwater or moist terrestrial environments. The ventral epidermis of turbellarians is ciliated which facilitates their locomotion.

www.earthlife.net/inverts/platyhelminthes.html

The Platyhelminthes are a successful phylum with around 25,000 known species divided into four classes. Most Platyhelminthes are parasites on other animals, only the Turbellarians are mostly non-parasitic. A few species are commensalists living in harmony, or mutual benefit with another, normally larger organism.

www.sciencedirect.com/topics/agricultural-and-biological-sciences/platyhelminthes

The Platyhelminthes includes three classes: the Turbellaria (free-living flatworms), the Trematoda (flukes), and the Cestoda (tapeworms). This diverse phylum includes some species that reproduce only sexually, others that reproduce only through asexual means including budding and fission, and some that can reproduce either way.

www.toppr.com/guides/biology/animal-kingdom/phylum-platyhelminthes

Platyhelminthes are commonly known as flatworms or tapeworms. They are a group of soft-bodied invertebrate animals. As a matter of fact, there are around 20,000 species of these animals. A few of these live as parasites on humans and other animals.

www.onlinebiologynotes.com/phylum-platyhelminthes-general-characteristics...

Phylum Platyhelminthes: General Characteristics and Classification. June 9, 2017 Gaurab Karki Class 11, ... Phylum Platyhelminthes is divided into three classes on the basis of body shape, mouth position and habitat ... Phylum Platyhelminthes: General Characteristics and Classification.

answersdrive.com/which-class-of-flatworms-are-not-parasitic-1795109

As members of the phylum Platyhelminthes, flatworms belong to four classes: Turbellaria, Monogenea, Trematoda, and Cestoidea. Within these four classes, there are hundreds of families and some 10,000 species, including animals with common names like free-living flatworms, parasitic flatworms, tapeworms, and flukes.