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Stoneflies - Plecoptera: Nemouridae of Gunnison County, Colorado

Zapada Nymph key to Species
Winter Stoneflies, Forestflies

Updated 2May2004                
1a. 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. Cervical gills less than 10 times as long as wide.
2a. Gills with 3 or 4 branches.
2b. Gills simple and unbranched.
Zapada oregonensis group.
Zapada haysi
is more common than Zapada oregonensis

You can barely see the ring of setae on both forelegs of this animal.

References

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

Good Links

Key to Male Zapada
Key to Female Zapada

Brown, Wendy S. 2004 Plecoptera or Stoneflies of Gunnison County, Colorado
www.gunnisoninsects.org