Family: Isonychiidae

Brush-Legged Mayflies

These photos supplement pages 49-62 of the Guide to Aquatic Invertebrates of the Upper Midwest. Information on the biology of Isonychiidae can be found on page 59. Isonychiidae can be distinguished by the double row of long setae (hairs) on the foreleg as seen below. They also have long hairs along the caudal filaments and oval gills on segments 1-7.




Isonychiidae dorsal


Isonychiidae leg