Most adults have amber colored forewings while alive. There are 10 species of Cinygmula in North America, however there are only these three species reported from Colorado.
| 1a. Each penis with a distinct lateral spine near the base on ventral surface. | |
| 1b. Penes without lateral spines. | |
| 2a. Median titillators long and prominent. Penes bilobed at apex. | |
| 2b. Median titillators short. Penes not bilobed at apex. | |
ReferencesJensen,SL 1966 The Mayflies of Idaho (Ephemeroptera). M.S. Thesis, University of Utah, Utah. 364 p.The above key is modified from Jensen's key on pages 152-153. LinksCinygmula IntroductionKey to the Adult Mayflies Brown, Wendy S. 2008 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA www.gunnisoninsects.org |