Key to Aquatic Macroinvertebrates in Utah - Oligochaeta
Aquatic worms belong in the class Oligochaeta.
Description: Less than 5 cm in length (but can reach up to 10 cm). Oligochaeta have symmetrical, segmented, bodies with zero to four bundles of chaetae (chitinous bristles) on every segment.
Habitat: Found in all aquatic environments, can survive very low oxygen conditions.