Like most common names, "Dun Variant" can refer to more than one taxon. They're previewed below, along with 4 specimens. For more detail click through to the scientific names.
These are often called Dun Variants.
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
These are very rarely called Dun Variants.
This intriguing species has received a lot of attention in past angling books. Recent authors suspect that much of this credit was a case of mistaken identity, with Attenella attenuata
receiving praise for the hatches of Drunella lata
and Dannella simplex
. Much of the credit was
legitimate and accurate, but this species is no longer thought to be on par with its most popular cousins in Ephemerella
I have several specimens listed under this species, but I'm not positive the identification is correct.