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en.wikipedia.org/wiki/Flatworm

The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied ...

www.ucmp.berkeley.edu/platyhelminthes/platyhelminthes.html

The simplest animals that are bilaterally symmetrical and triploblastic (composed of three fundamental cell layers) are the Platyhelminthes, the flatworms.

eol.org/pages/2884/overview

There are around 29,000 described species in the phylum Platyhelminthes ( Zhang 2011). Platyhelminths, or flatworms, include both free-living and parasitic ...

animaldiversity.org/accounts/Platyhelminthes

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

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

Get information, facts, and pictures about Platyhelminthes at Encyclopedia.com. Make research projects and school reports about Platyhelminthes easy with ...

www.britannica.com/animal/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 ...

www.biologyreference.com/Ph-Po/Platyhelminthes.html

The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar ...

tolweb.org/Platyhelminthes/2477

Turbellaria. Nemertodermatida; Acoela; Catenulida; Macrostomida; Lecithoepitheliata; Rhabdocoela; Prolecithophora; Proseriata; Tricladida; Polycladida.

www.discoverlife.org/nh/tx/Platyhelminthes

Discover Life's page about the biology, natural history, ecology, identification and distribution of Platyhelminthes - Flatworms, Tapeworms, Flukes -- Discover ...