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Stoneflies - Plecoptera: Family of Gunnison County, Colorado

Zapada Adult Male key to Species

1a. Wings uniformly brown; cervical gills 12-15 times as long as wide. Found in small headwater streams and spring fed creeks. Not reported from the county, but may be present.
1b. Wings mottled with dark bands; cervical gills less than 10 times as long as wide.
2a. Gills with 3 or 4 branches.
2b. Gills simple and unbranched.
3a. Epiproct with two sclerotized dorsal hooks.
3b. Epiproct entirely membranoous dorsally.

References

Baumann, RW Gaufin, AR, Surdick, RF 1977: The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208. Modified from the key on page 42.

Good Links

Key to Zapada Males
Key to Zapada Nymphs
Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado
www.gunnisoninsects.org