SURVEY OF IOWA MAYFLIES (EPHEMEROPTERA)

From newly and previously collected specimens of Ephemeroptera from Iowa, 62 species were determined. Of these, 39 are new state records. With the addition of another six species based only on literature records, the known Iowa fauna numbers 68 species. The mayfly fauna in Iowa is similar to, but apparently less diverse than, other Midwestern states east of the Mississippi River. Partially because of sampling bias, known mayfly diversity is greatest in central Iowa. Records of Camelobaetidius waltzi, Fallceon quilleri, Baetis longipalpus, and Caenis youngi in Iowa are important for interpreting the distribution patterns of these taxa.