An annelid worm of the class Oligochaeta, such as an earthworm.
- For example, bacterial endosymbionts as found in the giant vent Pogonophora are also present in many meiofaunal oligochaetes, nematodes and flatworms.
- Many polychaetes and oligochaetes, and even a few leeches, are burrowers that constantly rework the sediment through which they burrow; in addition, they may ingest and excrete large quantities of sediments or soils.
- Some information has been gathered on the expression of transcription factors associated with segmentation and regeneration in oligochaete annelids.
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