Animal Phylum Arthropoda (Arthropods)

A variety of cased caddisfly larvae, probably mostly Neophylax, have clustered along the backside of a rock in fast water. There seem to be some Helicopsychidae larvae clustered along the bottom, and a few other taxa are mixed in. It's interesting that several larvae have especially large stones placed over the front openings of their cases, perhaps to block the case off for pupation.

It does seem to be the wrong time of year for Neophylax to be pupating, but that was the ID given for one of these which I collected and photographed up close.

In this picture: Caddisfly Genus Neophylax (Autumn Mottled Sedges) and Caddisfly Genus Helicopsyche (Speckled Peters).

The mayfly and stonefly nymphs in this picture blend in extremely well.

In this picture: Mayfly Species Ephemerella invaria (Sulphur Dun) and Insect Order Plecoptera (Stoneflies).

Several caddis larvae cling in the current amongst the debris collected on an underwater alder branch.

In this picture: Insect Order Trichoptera (Caddisflies).

Several Baetid mayfly nymphs cling to this rock. There are also some clumps of small stones which hold strong caddisfly larvae.

In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and Insect Order Trichoptera (Caddisflies).

A careful look at this picture reveals at least three water boatmen swimming around.

In this picture: True Bug Family Corixidae (Water Boatmen).