Flatworms & Roundworms

Flatworms & Roundworms

By Lacey Jones

Flatworms are the least complex of all types of worms. There are around 29,000 species.

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They are members of the Phylum Platyhelminthes.

• They get their name from the Greek work "platy" meaning flat and "helminth", meaning worm. Their body is flattened​ dorso-ventrally.

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Flatworms

Flatworms are acoelomates and have thin, solid bodies.

• Acoelomates lack a true body cavity.​

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​They are the simplest animals with bilateral symmetry and triploblastic (composed of three fundamental cell layers).