Ephemeroptera: Caenidae & Tricorythidae (Crawling 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.
- Gills hidden under platelike or triangular gill covers on abdominal segment 2.
(Caution: if gill covers present on segments 3 or 4, then nymph should be identified as "other mayflies.")
Length: 2 mm to 10 mm
crawling_mayflies
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crawling_mayfly
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trian
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