Key to common benthic macroinvertebrates of watercourses.
2a) Organism within a one-piece shell that may be coil, spiral or hat shaped. SNAILS 2b) Organism enclosed in a hinged two-piece shell.BIVALVES Return to Couplet 1 Return to BioMAP Central
2b) Organism enclosed in a hinged two-piece shell.BIVALVES Return to Couplet 1 Return to BioMAP Central
