Cold-water-specialist
Guides
Ameletus
Upland Summer Mayfly (A. inopinatus)
Ameletus is a genus of mayflies (Ephemeroptera) and the type genus of the family Ameletidae, circumscribed by Rev. A. E. Eaton in 1885. The genus is speciose, with approximately 30 bisexual species recognized in North America and additional species in Europe and Asia. Ameletus species occur in cold-water streams from small headwater brooks to larger rivers, with greatest diversity in mountainous regions of western North America. The genus includes A. inopinatus, the only predominantly montane mayfly species in the UK and a noted climate change indicator species.
Amphizoa
troutstream beetles
Amphizoa is a monogeneric genus of aquatic beetles, the sole representative of the family Amphizoidae. These beetles are commonly called troutstream beetles due to their association with cold, flowing mountain waters. The genus contains five known species, with three distributed in western North America and two in the eastern Palearctic region (China and North Korea). Adults and larvae are predatory, feeding primarily on stonefly larvae. When disturbed, adults release a yellowish, cantaloupe-scented fluid from the anus as a chemical defense.