Abstract
The genus Lumahyphes Molineri, 2004 (Ephemeroptera: Leptohyphidae) currently is comprised of three species. Lumahyphes cocal sp. nov. is described based on material from the state of Roraima in northern Brazil. The new species differs from the other described species by having the following combination of characteristics: greyish wing membrane; terga base color whitish and terga I–III & VIII–X washed completely with gray; dorsal structure of penes rounded; spines of penes S-shaped in lateral view; and apex of spines directed anteriorly.