Ephemeroptera: Oligoneuridae (Torpedo Mayflies)
- 3 pairs of jointed legs, each with a single claw; 3 tail-like filament with dense fringe on inside edges.
- 1 pair of wingpads apparent.
- Flat gills with tufts along abdomen.
- Thorax extremely hunched and head angle slightly beyond vertical.
- Forelegs with dense comb of long, stout hairs.
- Mouth parts hairy.
Length: 9 mm to 17 mm
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