''Ephemerella invaria'', the sulphur dun, is a species of spiny crawler

mayfly Mayflies (also known as shadflies or fishflies in Canada and the upper Midwestern United States, as Canadian soldiers in the American Great Lakes region, and as up-winged flies in the United Kingdom) are aquatic insects belonging to the orde ...

in the family

Ephemerellidae Ephemerellidae are known as the spiny crawler mayflies. They are a family of the order Ephemeroptera. There are eight genera consisting of a total 90 species (Merritt & Cummins). They are distributed throughout North America as well as the UK. T ...

. It is found in southeastern and northern Canada and the eastern United States.

References

Mayflies Articles created by Qbugbot Insects described in 1853 Insects of Canada {{mayfly-stub