Under construction! Most families don't have keys yet, many links are to introductions for various families.
|1a. Case coiled like a snail shell, constructed of sand grains or small rock fragments. Anal claw comb-shaped.
HELICOPSYCHIDAE: Helicopsyche borealis
|1b. Case straight (or slightly curved) or larvae free-living, without a case. Anal claw hook-shaped.|
|2a. Dorsum of each thoracic segment covered by sclerites.|
|2b. Metanotum and sometimes mesonotum entirely membranous, or largely so and bearing several pairs of smaller sclerites.|
|3a. Mature larvae are large 20 mm + in length. Free living, no case, larvae construct fixed retreats under rocks. Abdomen with ventrolateral rows of branched gills; prominent brush of long hairs at base of anal claw. Posterior margin of meso and metanotal plates is lobate.|
|3b. Very small, mature larvae are less than 6 mm long. Purse shaped case of sand, algae or silk. Abdomen lacking ventrolateral gills. Only one or two hairs at base of anal claw. Posterior margin of meso- and metanotal plates usually straight.|
|4a. Antennae very long and prominent for a caddisfly, at least 6 times as long as wide. and/or sclerites on mesonotum lightly pigmented except for as pair of dark curved lines on posterior half. Case of sand grains or fine stones.|
|4b. Antennae of normal length, no more than 3 times as long as wide, or not apparent. Mesonotum never with a pair of dark curved lines.|
|5a. Mesonotum largely or entirely membranous, or with small sclerites not covering more than half the mesonotum. Pronotum never with an anterolateral lobe.|
|5b. Mesonotum largely covered by sclerotized plates, variously subdivided and usually pigmented, although sometimes lightly. Pronotum sometimes with a transverse carina terminating in prominent antero lateral lobes.|
|6a. Abdominal segment IX with sclerite on dorsum.|
|6b. Abdominal segment IX with membranous dorsum.|
|7a. Metanotal sa3 usually consisting of a cluster of setae arising from a small rounded sclerite. Prosternal horn present. Mature larvae are among the largest cased larvae in our valley. (Grammotaulius, a Limnephilidae species are bigger.) Case tubular portable case of plant materials, sometimes with a spiral pattern.
PHRYGANIDAE Agrypnia deflata
|7b. Metanotal sa3 consisting of a single setae not arisiong from a sclerite. Prosternal horn absent. Case either tortoise-like, made of stones or no case, free living animals.|
|8a. Basal half or anal proleg broadly joined with segement IX, anal claw with at least one dorsal accessory hook. Case Tortoise-like portable cases of small stones.
|8b. Most of anal proleg free from segment IX, anal. Claw without dorsal accessory hooks. No case - free living. Often bright green while alive.
RHYACOPHILIDAE Rhyacophila Introduction
|9a. Labrum membranous and T-shaped, often withdrawn from view in preserved specimens. Case Free living with sac-shaped nets of silk.
PHILOPOTAMIDAE Dolophilodes aequalis
|9b. I expect more species here - fix this!|
|10a. Abdominal segment I lacking both dorsal and lateral humps. Each metanotal sa1 usually lacking entirely, or represented by only a single seta without a sclerite. Log cabin-like case, case of fine stones or case of plant materials.|
|10b. Abdominal segment I always with a lateral hump on each side although not always prominent, with or without a dorsal hump; metanotal sa1 always present, usually with a sclerite bearing several setae but with at least a single setae. Case Various portable cases|
|11a. Antennae close to anterior margion of eye, median dorsal hump of segment I lacking. Case of plant materials or sand. Often small dark cases in the upper Gunnison Basin.
Lepidostomatidae Lepidostoma Introduction
|11b. Antennae about halfway between anterior margin of head capsule and eye. Median dorsal hump always present.|
|12a. Mesonotum with notch in anteromesal edge.|
|12b. Mesonotum with anteromesal edge straight.|