Animal Phylum Arthropoda (Arthropods)

Several caddisfly larvae in their cases cling to the debris in this picture.

In this picture: Insect Order Trichoptera (Caddisflies).

Here's a view through the stationary den of a type of netspinning caddisfly larva.

In this picture: Insect Order Trichoptera (Caddisflies).

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).

This isn't really an underwater picture, but a picture taken into my aquarium of midge larvae which lived in the silt I used for substrate. Each larva has a little tower of detritus (Detritus: Small, loose pieces of decaying organic matter underwater.) built up along the bottom, while the bare larva waves around from the top.

In this picture: True Fly Family Chironomidae (Midges).