Large Mahogany Duns
This common name refers to only one species.
These are sometimes called Large Mahogany Duns.
This is by far the most important species of Isonychia
. Many angling books once split its credit with the species Isonychia sadleri
and Isonychia harperi
, but entomologists have since discovered that those are just variations of this abundant species.
See the main Isonychia
page for more about these intriguing mayflies.
Isonychia bicolor (Mahogany Dun) Mayfly Nymph
View 7 PicturesThis Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.
Collected April 19, 2006
from in Added to Troutnut.com by on April 21, 2006