Insect Order Trichoptera (Caddisflies)

There's a large Ephemerella subvaria nymph in the top left.

In this picture: Mayfly Species Ephemerella invaria (Sulphur Dun), Insect Order Trichoptera (Caddisflies), and Mayfly Species Ephemerella subvaria (Hendrickson).

A wide variety of caddis larvae and other insects have clustered together on the backside of this rock in fast water.

In this picture: Caddisfly Genus Neophylax (Autumn Mottled Sedges).

Three big Ephemerella subvaria mayfly nymphs share a rock with some cased caddis larvae.

In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Saddle-case Maker Genus Glossosoma (Little Brown Short-horned Sedges).

There's a stonefly nymph in the bottom right corner of this picture, but what's really interesting is those white blotches. They're pretty common in my Wisconsin home river river, stuck flat onto the rocks--lots of rocks have a speckled look as a result. They are microcaddis cases, made by larvae of the caddisfly family Hydroptilidae. These are made by larvae of the subfamily Leucotrichiinae, most likely the genus Leucotrichia. They spin little flat oval cases of silk tight and immobile against the rocks.

In this picture: Caddisfly Species Leucotrichia pictipes (Ring Horn Microcaddis).

Several cased caddis larvae cling to the twigs of a fallen tree limb in a clear trout stream's strong current.

In this picture: Insect Order Trichoptera (Caddisflies).

An Ephemerella subvaria nymph clings to a white rock in the foreground, and there are other nymphs in the background.

In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Insect Order Trichoptera (Caddisflies).