Long Horn Sedges
.............................Fly Fishing Yellowstone National Park

Long-Horned Sedges (Oecetis species)

The Long Horn Sedges are caddisflies with long antennae. There are a couple of
genera of caddisflies with long antennae that are important in Yellowstone National
Park. They are the
Oecetis species usually called the Long-Horn Sedges, which this
article is about; and the
Nectopsyche species, usually called the White Millers.  I
mentioned both of them here to avoid any potential confusion between the two genera.
Oecetis genus contains two species that entomologist have noted to be present in
the park. They are the
disjuncta and the avara species. Two more species, the
and the ochracea have been found in Wyoming but I am not certain that
they exist in the park.
These caddisflies are normally associated with slower moving or still water; however,
they are present in the Madison River and I would certainly not classify the Madison as
a slow moving river. We have found them in the early part of the fishing season as well
as the late summer and early fall months. They are also present in the slow moving
meadow streams such as Pelican Creek where I have noticed very large hatches of
them in late Summer. I am not certain if this is due to a difference in the particular
species of
Oecetis or that they are found in diverse habitats. I do know that when they
are present, they are eaten by the trout and that is what counts. You want have any
problem identifying them. Their antennae are twice as long if not longer than their

Coming Up Next:
Long-Horned Sedge - Larvae, Pupae and Adults

Copyright 2008 James