Oligochaeta
plural nounDefinition of Oligochaeta
: a class or in former classifications an order of Chaetopoda comprising hermaphroditic terrestrial and aquatic annelids distinguished from the polychaetes by possession of compact localized gonads and simple direct life histories without formation of a trochophore and by lack of parapodia and head specialization — see archioligochaeta , neoligochaeta
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