Primitive-mayfly
Guides
Siphlonurus occidentalis
primitive minnow mayfly
Siphlonurus occidentalis is a species of primitive minnow mayfly in the family Siphlonuridae. It belongs to a group of mayflies considered evolutionarily basal within the order Ephemeroptera. The species has a broad distribution spanning from Central America through North America, including Alaska and northern Canada. Like other members of its family, it likely inhabits cool, flowing waters and exhibits the characteristic aquatic nymph and terrestrial adult life stages typical of mayflies.