Most Popular Links
Ephemerellidae Level 1 Level 2
Abdominal gills absent on segment 2, rudimentary or absent on segment 1, present on segments 3-7 or 4-7. Gills have dorsal and ventral lamella (with numerous lobes). Paired abdominal tubercles often present.
|Tolerance||Variable, from 0-7|
|Distribution||CA, OR, WA, NV, AZ, Baja|