Key to common benthic macroinvertebrates of watercourses.

4a) Body flat and unsegmented, dorsal surface generally darker in colour than ventral surface.
Platyhelminthes: FLATWORMS:




4b) Body worm-like, dorsal and ventral surfaces similar in colour. Body may be segmented or
unsegmented. Anterior and posterior suckers may be present. 5




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