Key to common families of insects in the Niagara region

40a) Abdomen with 10 pairs of lateral filaments. Last abdominal segment with 2 pairs of
claws. GYRINIDAE

40b) Abdomen without lateral filaments or with only 6 pairs. Last abdominal segment without
2 pairs of claws; usually with a pair of filaments (cerci). DYTISCIDAE




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