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Epeorus frisoni also known commonly as the Roaring Brook Mayfly is a species of mayfly endemic to Mount Katahdin in Maine, and the only mayfly species known to be endemic only to New England. The first specimen of Epeorus frisoni was collected in 1939 by an Illinois entomologist named T.H. Frison, who was collecting mayflies and stoneflies while on a hike with his family.

Historical
The first known specimen of E. frisoni was collected in 1939 by Illinois entomologist T.H. Frison, who was gathering specimens of mayflies and stoneflies in Baxter State Park while hiking with family. While at a site known as "Roaring Brooks" Frison collected a single male imago, which was assessed a few years later by another expert who named it after it's collector. For nearly a half-century the species went largely unnoticed until the early 1990s, when Maine began updating there Endangered Species List to include vertebrates. In 1997 the mayfly species became listed on Maine's State Endangered Species list. With the permission of Baxter State Park the Maine Department of Inland Fisheries and Wildlife (MDIFW) was granted access to Roaring Brook as well as two of it's tributaries to collect specimens of Epeorus, in hopes of locating the species that had only been found once before. The scientific team was able to find and validate the species at Roaring Brook, and the species remains endangered in Maine.