Definition of Oligochaeta in English:
A class of annelid worms that includes the earthworms. They have simple setae projecting from each segment and a small head lacking sensory appendages.
- Annelids with a clitellum (a swelling towards the head of the animal, where the gonads are located) are classified in the Clitellata, which is further divided into Hirudinea and Oligochaeta (including the earthworms).
- The phylum Annelida is traditionally divided into three classes: Oligochaeta, Hirudinida, and Polychaeta (marine annelids).
- In traditional classification schemes, the Annelida consists of the Polychaeta and the Clitellata (the latter including the Oligochaeta and Hirudinida).
Definition of Oligochaeta in:
- British & World English dictionary
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