Key to common families of insects in the Niagara region

8a) Abdomen with 2 or 3 tail filaments. Gills present on abdomen and absent from thorax.
Mayflies --13




8b) Abdomen with only 2 tail filaments. Gills, when present, located as tufts on thorax; gills
are rarely present on first two abdominal segments, or between tail filaments. Stoneflies -- 17




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