Key to common benthic macroinvertebrates of watercourses.
1a) Organism is within a shell composed of calcium carbonate. Molluscs -- 2 1b) Organism not within a shell; animal either soft-bodied or with a hard exoskeleton. 3 Return to BioMAP Central
1b) Organism not within a shell; animal either soft-bodied or with a hard exoskeleton. 3 Return to BioMAP Central
