Ephemeroptera of the Daniel L. Gustafson Aquatic Invertebrate Collection, Montana Entomology Collection, Montana State University

Ephemeroptera (commonly called mayflies) is an order of insects well-recognized by fishing enthusiasts and regularly used in water quality assessments. From 2018 to 2022, Montana Entomology Collection (MTEC), funded by the Council on Library and Information Resources “Hidden Collections” grant, digitized mayfly specimens housed in its museum. Digitization of label data produced over 2900 records detailing sampling localities, collecting dates, number of individuals, and identifications of mayflies collected mainly from Montana, USA. The records reveal the efforts of 29 collectors, contributing specimens since the 1970s. The digital records make information associated with 37,000 individual specimens from approximately 100 species stored in the MTEC available.