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en.wikipedia.org/wiki/Flatworm

Description. Varied flatworm species from Kunstformen der Natur (1904), plate 75. Distinguishing features. Platyhelminthes are bilaterally symmetrical animals: their left and right sides are mirror images of each other; this also implies they have distinct top and bottom surfaces and distinct head and tail ends. Like ...

www.britannica.com/animal/flatworm

Flatworm: 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. They are bilaterally

targetstudy.com/nature/animals/platyhelminthes

Platyhelminthes are a Phylum of Bilaterian, Unsegmented, Soft-Bodied, usually Flattened Invertebrate Animals. They are also known as Plathelminthes or simply Flatworms. Platyhelminthes include Animals like Flukes, Tapeworms, Planarians, Turbellaria etc. There are more than 20000 Species of Platyhelminthes.

faculty.fmcc.suny.edu/.../Animals&PlantsBook/Animals/03-Flatworms.htm

Flatworms belong to the Phylum Platyhelminthes (Latin for "Flatworms," although it sounds much more official), whose characteristics shape - flat - is an evolutionary answer to a problem of multicellular life: as an animal gets bigger, the inside cells get farther and farther away from the outside, so that oxygen gets depleted before it reaches them and wastes build up on the way out.

www.microscopemaster.com/flatworms.html

Flatworms Definition, Examples, Classification and Characteristics Definition - What are Flatworms? Flatworms (Platyhelminthes) are a group of bilaterally symmetrical, acoelomate, soft-bodied invertebrate animals found in marine, freshwater as well as moist terrestrial environments.

www.newworldencyclopedia.org/entry/Flatworm

Description. A flatworm's soft body is ribbon-shaped, flattened dorso-ventrally (from top to bottom), and bilaterally symmetric.They are the simplest triploblastic animals with organs. This means their organ systems form out of three germ layers: An outer ectoderm and an inner endoderm, with a mesoderm between them.

www.earthlife.net/inverts/platyhelminthes.html

Platyhelminthes are mostly worm like creatures that are dorsoventrally flattened, meaning they look like a ribbon, this is why they are called names such as Tapeworm, Flatworm, Fluke and Planarian. The Platyhelminthes are a successful phylum with around 25,000 known species divided into four classes.

animalcorner.co.uk/animals/flatworms

Flat Worms (Phylum Platyhelminthes) 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.

www.biologyjunction.com/planarian_characteristics.htm

Flatworm Characteristics –Flat bodies (gases move by diffusion) –bilateral symmetry –gastrovascular cavity –some flatworms are parasitic, some are freeliving –they have anterior and posterior heads and exhibit cephalization > Types of Flatworms (planarian, tapeworm, fluke) Planarian (also known as Dugesia)–lives in freshwater –mostly a scavenger, also feeds on protists ...

www.britannica.com/animal/flatworm/Ecology

Flatworm - Ecology: Turbellaria are adapted to a wide range of environments, and many species are resistant to extreme environmental conditions. Some occur in coastal marine habitats—in sand, on or under rocks, and in or on other animals or plants. Some marine species occur at relatively great depths in the sea; others are pelagic (i.e., living in the open sea).