Topic: Platyhelminthes

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Platyhelminthes

The Columbia Encyclopedia, Sixth Edition
Platyhelminthes , phylum containing about 20,000 species of soft-bodied, bilaterally symmetrical, invertebrate animals, commonly called flatworms. There are four classes: the free-living, primarily aquatic class, Turbellaria, and Trematoda, Cestoda, and Monogenea, which are considerably modified for their exclusively parasitic existence. While the structure of the flatworms marks a major step in animal evolution, their origin and relationships within the group are still controversial. Anatomy Flatworms are dorso-ventrally flattened. The epidermis is generally ciliated in the turbellarians,... Read more
Platyhelminthes
Biology Platyhelminthes The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft ... but no respiratory system. The class Turbellaria includes all free-living members of the phylum, as well as a few parasites ... Read more
Archoophora
A Dictionary of Zoology Archoophora (phylum Platyhelminthes , class Turbellaria ) A subclass of entirely marine worms, which comprises the two orders Acoela and Polycladida . Read more

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