| 1a. Paraprocts divided into 3 lobes with spines or prongs on middle or outer lobes. | |
| 1b. Paraprocts single or divided into 2 lobes; no spines on outer lobes. | |
| 2a. Cervical gills branch from base at the neck; mesobasal lobe absent. | |
| 2b. Some cervical gills branch midway out their length; mesobasal lobe present at base of cerci in dorsal aspect.
(Gills have a Y-shape) |
|
| 3a. Lateral knobs present at basal corners of epiproct; basal cushion present at dorsal base of epiproct; cervical gills present. | |
| 3b. Lateral knobs absent; basal cushion absent. | |
| 4a. Dorsal sclerite of epiproct large and lateral arms well developed. | |
| 4b. Dorsal sclerite of epiproct reduced in size and lateral arms poorly developed. Prostoia besametsa |
LinksKey to Nemouridae nymphs of Gunnison CountyKey to Nemouridae Females of Gunnison County ReferencesKeys and illustrations from the following publications were altered to construct this key:Baumann,RW; Gaufin,AR; Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208. Stewart,KW; Harper,PP 1996: Plecoptera. In: An Introduction to the Aquatic Insects of North America. 3rd ed. Eds: Merritt,RW; Cummins,KW Kendall/Hunt Publishing Company, Dubuque, Iowa, 217-266. Ward,JV; Kondratieff,BC; Zuellig,RE 2002: An Illustrated Guide to the Mountain Stream Insects of Colorado. 2nd ed. University Press of Colorado, Boulder, Colorado. 219 pages. Updated 2May2004 |