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Hexagenia bilineata Say; adult Adult male (segmentation of the tails omitted...) 1; Legs of one side,
1. Hexagenia bilineata Say; adult
Adult male (segmentation of the tails omitted...) 1; Legs of one side, fore, middle, and hind from left to right... 2; end of the abdomen of the male from beneath, showing forceps, penes, and base of tails; middle tail rudimentary
Hexagenia nymphs Nymph of H. bilineata Say, dorsal view. The hind feet are turned forward for comparison
2. Hexagenia nymphs
Nymph of H. bilineata Say, dorsal view. The hind feet are turned forward for comparison with the other feet, and the gills on the right are moved aside to show the markings on the abdomen. The 3-branched, rudimentary gills on the first abdominal segment are abnormal
  
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