Flatheaded-mayflies
Guides
Cinygmula
Cinygmula is a genus of flatheaded mayflies (Heptageniidae) comprising at least 30 described species. The genus is characterized by distinctive morphological features in some species, including pointed claws and a distinct frontal fold on the imago. Species occur in high-altitude alpine habitats across central Asia and the eastern Himalaya. The genus has been studied for its potential use as a bioindicator of aquatic contamination.
Heptagenia
flatheaded mayflies
Heptagenia is a genus of flatheaded mayflies in the family Heptageniidae, containing at least 20 described species. Nymphs are primarily benthic inhabitants of lotic systems, where they construct burrows in sandy or gravelly substrates and employ filter-feeding mechanisms. Adults are distinguished from the related genus Raptoheptagenia by the absence of anastomosed crossveins in the stigmatic area of the forewing and by having foretarsi shorter than the tibiae. The genus has been documented across North America, Europe, and Asia, including the Western Himalaya.