types:

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archiannelid

small primitive marine worm lacking external segmentation and resembling polychaete larvae

oligochaete, oligochaete worm

hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body

polychaete, polychaete worm, polychete, polychete worm

chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles

bloodsucker, hirudinean, leech

carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end

angleworm, crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler

terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers

lobworm, lug, lugworm

marine worms having a row of tufted gills along each side of the back; often used for fishing bait

sea mouse

any of several large worms having a broad flattened body with a mat of coarse hairs covering the back

bloodworm

a segmented marine worm with bright red body; often used for bait

Hirudo medicinalis, medicinal leech

large European freshwater leech formerly used for bloodletting

horseleech

any of several large freshwater leeches

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