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order
Coleoptera
“Adult Beetles”
Coleoptera
“Larval Beetles”
Diptera
“True Flies”
Ephemeroptera
“Mayflies”
Hemiptera
“True Bugs”
Lepidoptera
“Aquatic Caterpillars, Snout Moths”
Megaloptera
“Alderflies, Dobsonflies, and Fishflies”
Odonata
“Dragonflies and Damselflies”
Plecoptera
“Stoneflies”
Trichoptera
“Caddisflies”
Coleoptera
family
Dytiscidae
“Predacious Diving Beetle Larvae”
Elmidae
“Riffle Beetle Larvae”
Gyrinidae
“Whirligig Beetle Larvae”
Haliplidae
“Crawling Water Beetle Larvae”
Hydrophilidae
“Water Scavenger Beetle Larvae”
Psephenidae
“Water Pennies”
Ptilodactylidae
“Toe-Winged Beetle Larvae”
Elmidae
genus
Ancyronyx variegatus
Dubiraphia
Macronychus glabratus
Microcylloepus
Optioservus
Stenelmis
Microcylloepus
“Riffle Beetle Larvae”
Genus Overview
6 species in North America.  A small riffle beetle associate with springs, even warm springs from out West. 
Characteristics
POLLUTION TOLERANCE
Southeast: 2.1 and higher
Upper Midwest: 3 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Gatherer
Scraper / Grazer
Shredder / Herbivore
MOVEMENT
Burrower
Climber
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-depositional
Lotic-erosional
Diagnostic Characters
order
Eye Spots
Lateral Gills USUALLY Absent
USUALLY 4-5-Segmented Legs
family
Brown, Sclerotized, Spindle-Shaped Body
Operculum
+ Expanded Character List
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Dorsal
Ventral