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Mayflies: Ephemera viria Etn. 1. Lateral view of the nymph. Note the latero-dorsal breathing organs or
1. Mayflies: Ephemera viria Etn. 1. Lateral view of the nymph. Note the latero-dorsal breathing organs or gills on the abdominal segments; 2. Dorsal view of the nymph. This view shows how these organs may arch over the back; 3. Lateral view of the male imagop; 4. Dorsal view of the male imago
Siphturus alternatus Say.: 5. Lateral view of the nymph. This larva possesses a different type of abdominal breathing organs or gills; 6. Dorsal view of the nymph. This view shows the overlapping of the gills and also gives some hint of the number of trachae or air tubes, represented by black lines in each; 7. Lateral view of the male imago
   
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