- Ephemeroptera
- Baetidae
- Antenna
2-3 times as long as the width of the head
- Wing pads
missing or very small
- Heart
shaped or oval gills
- Head
vertically oriented
- 2 or 3
tails
-
Heptageniidae
- Flattened
bodies
-
Outstretched legs
- Claws
shorter than tarsi
- Head
horizontal orientation
-
Ephemerellidae