| Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts |
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| Two tail filaments; with conspicuous gills attached to thorax...
| Two tail filaments; without conspicuous external gills...
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| Three tail filaments; conspicuous, leaf-like gills attached to abdomen...
| Two tail filaments; large mandibles can be seen from above.COLEOPTERA:
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