''Cinygma'' is a genus of

mayflies 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 order ...

in the family

Heptageniidae The Heptageniidae (synonym: Ecdyonuridae) are a family of mayfly, mayflies with over 500 described species mainly distributed in the Holarctic, Oriental, and Afrotropical regions, and also present in the Central American Tropics and extreme north ...

. Nymphs move sluggishly and are poor swimmers, nearly always clinging to wood or rocks.

References

* Mayflies Mayfly genera Insects of Europe {{mayfly-stub