Clinger-mayfly
Guides
Spinadis simplex
Wallace's Deepwater Mayfly
Spinadis simplex is a species of mayfly in the family Heptageniidae, commonly known as Wallace's Deepwater Mayfly. It is a North American species first described by Walsh in 1863. The genus Spinadis is distinguished within the Heptageniidae by specific morphological characteristics related to wing venation and genitalia structure. Like other members of the family, S. simplex has aquatic nymphal stages and winged adult stages with brief adult lifespans.