Western Slate Olive Duns
Like most common names, "Western Slate Olive Dun" can refer to more than one taxon. They're previewed below, along with 6 specimens. For more detail click through to the scientific names.
These are pretty much always called Western Slate Olive Duns.
This taxon prefers cold water and does not flourish where water temperatures exceed 60 degrees. As with the slightly larger Drunella coloradensis
, this species prefers cold tailwaters, high elevation headwaters and spring creeks.
These are very rarely called Western Slate Olive Duns.
Drunella flavilinea (Flav) Mayfly Nymph
View 6 PicturesAlthough the identification is not certain because the nymph is not yet mature, the configuration of tubercles (
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.) on this one--particularly the forefemora--seems to best match Drunella flavilinea.
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.
Collected July 2, 2019
from in Added to Troutnut.com by on July 18, 2019