The flatworms: soft-bodied invertebrates with a flattened, unsegmented body, no body cavity, and a single opening that serves as both mouth and anus. Platyhelminthes includes free-living planarians as well as parasitic tapeworms and flukes that infect a very wide range of vertebrate hosts.
Facts
Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Connections
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