Family: Tricorythidae

Little Stout Crawler Mayflies

These photos supplement pages 49-62 of the Guide to Aquatic Invertebrates of the Upper Midwest. Information on the biology of Tricorythidae can be found on page 62. Tricorythidae have triangular operculate gills that do not touch along the midline. Caenidae gills are square and nearly or absolutely touching along the midline. Click to compare with Caenidae




Tricorythidae gills