Key to common benthic macroinvertebrates of watercourses.
5a) Body segmented and either flat with anterior and postior suckers, or worm-like with or without tenticles at one end. Annelids - 6 5b) Body worm-like but not segmented, suckers absent. Proboscis Worms Round Worms Horse-hair Worms Return to Couplet 4 Return to BioMAP Central
