Other Common Names
Orange Caddis Worm (larva)
22 species in North America (nearctica.com
Adult: head, antennae, body, and legs usually blackish; front wings uniformly dark brown to black; some species have sides of abdomen creamy white
Larva: head dark orange; body and legs medium orange (preserved specimens fade to pale yellow or white); labrum T-shaped; dorsal anterior margin of head has asymmetrical notch
larvae in fast-flowing portions of rivers and streams; adults on nearby vegetation, and are attracted to artificial light
larvae are filter-feeders, eating small particles of plant and animal matter plus algae such as diatoms that become trapped in the meshes of their nets
Larvae spin very fine-meshed nets, usually grouped together on the undersides of rocks near the upstream edge. The nets collapse when the rocks they are attached to are removed from the water.
Guide page creation based on David Funk's identification of this image
to genus level.
Adults of Brachycentrus
(Brachycentridae) are also blackish but the outer margin of the front wing is elongate and more pointed, and the wing veins are more distinct/visible (see images of adults [called Grannoms by anglers] here
Larvae are distinguished from other genera of Philopotamidae by the asymmetrical notch in the dorsal anterior margin of the head.
plus desription, biology, and common name references (Wilfred Laurier U., Ontario)
key to genera of adults, pupae, larvae
of Philopotamidae (Ethan Bright, U. of Michigan)
systematics and distribution
(Roger Blahnik, U. of Minnesota)
systematics; PDF doc
plus description and technical drawings of Australian species (David Cartwright, Museum Victoria, Govt. of Australia)