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Ephemeroptera: Leptophlebiidae of Gunnison County, Colorado

Nymph key to Genera of Prong-gilled Mayflies

Updated 6 Dec 2009

1a. Labrum as wide or wider than head capsule; gills oval with fringed margins.

This species is found at lower elevations in rivers with fine sediments.

(Edmunds 1948)
1b. Labrum much narrower than head capsule; gills without fringed margins. Gills usually forked.

There are several species present at all elevations. Many live in streams with a cobble substrate and faster water than T. albertana.


Edmunds GF Jr. 1948 A new genus of mayflies from western North America (Leptophlebiinae). Proceedings of the Biological Society of Washington 61:141-148.
     Cropped images of head and gills for Traverella albertana nymphs are from Plate VI, figure 16 on page 148.

Good Links

Key to Adult Leptophlebiidae

Brown, Wendy S. 2004 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA