Ephemerella aurivillii
Ephemerella aurivillii is a species of spiny crawler mayfly in the family Ephemerellidae. It is found in Europem, Northern Asia (excluding China) and North America. In North America its range includes all of Canada, the northern, southwestern United States, and Alaska.

References

Mayflies
Articles created by Qbugbot
Insects described in 1908
Palearctic insects