Key to common benthic macroinvertebrates of watercourses.

9a) Body circular in shape, no segmentation evident; may be brightly coloured and patterned. No
antenna on head. Total length less than 5mm. WATERMITES




9b)Body not circular in shape, segmentation evident Head with 2 pairs of antenna. Forelegs with
grasping appendages (pinchers). Total length greater than 5mm. CRUSTACEANS




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