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”
family
Elmidae
Macronychus glabratus
“Riffle Beetles”
Genus Overview
Only one species found in North America. Recognized by the shiny elytra margin.
Characteristics
POLLUTION TOLERANCE
Southeast: 4.7 and higher
Upper Midwest: 4 and higher
Midwest: 2.9 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Gatherer
MOVEMENT
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-depositional
Lotic-erosional
Lotic-erosional
Diagnostic Characters
order

Elytra
family

5-Segmented Tarsi

Big Claws

Last Tarsal Segment

Thread-like Antennae
genus

Antennae With 7 Segments

Prosternal Process

Tomentum of tibia
+ Expanded Character List
Order:
Adults with hardened forewings (elytra) covering the hind wings.
Family:
Terminal segment of each antenna no longer than combined length of 2 preceding segments; antennae thread-like. Elytra concealing entire abdomen or exposing only part of 1 tergite. Each leg with 5 tarsal segments, last tarsal segment about as long as other segments combined and with big claws. Abdomen with 5 visible segments.
Genus:
Prosternal process with a posterior margin about as wide as head. Elytra with sublateral carinae. Antennae with 7 segments and enlarged at last segment. No transverse impression on pronotum.


Dorsal
Ventral