types:

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planaria, planarian

free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts

fluke, trematode, trematode worm

parasitic flatworms having external suckers for attaching to a host

cestode, tapeworm

ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates

Fasciola hepatica, liver fluke

flatworm parasitic in liver and bile ducts of domestic animals and humans

Fasciolopsis buski

fluke that is parasitic on humans and swine; common in eastern Asia

blood fluke, schistosome

flatworms parasitic in the blood vessels of mammals

echinococcus

tapeworms whose larvae are parasitic in humans and domestic animals

taenia

tapeworms parasitic in humans which uses the pig as its intermediate host

type of:

worm

any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae