Definitions for "Oligochaeta"
An order of Annelida which includes the earthworms and related species, including some small freshwater species.
One of the taxonomic classes in the phylum Annelida. Members of this class have segmented bodies, setae on all segments (except the peristomium and periproct), a true coelom, a closed vascular system, and crawl using circular and longitudinal muscles.