Ephemeroptera: Baetidae and Siphlonuridae (Swimming Mayflies)
- 3 pairs of jointed legs, each with a single claw; 3 tail-like filament.
- 1 pair of wingpads apparent.
- Flattened gills on abdomen.
- Head vertical, with mouthparts pointing downward.
Length: 3 mm to 14 mm
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| Swimming Mayfly |
Updated: Apr 06, 2007. |
 Peter Chen. |
