| Noun | 1. | class Oligochaeta - earthworms Annelida, phylum Annelida - segmented worms: earthworms; lugworms; leeches oligochaete, oligochaete worm - hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, angleworm, crawler, wiggler - terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers Branchiobdellidae, family Branchiobdellidae - small annelid worms with the posterior end modified into an adhesive sucker; especially formerly regarded as modified leeches class - (biology) a taxonomic group containing one or more orders |