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Genus Overview
No genus-level description defined.
Characteristics
POLLUTION TOLERANCE
Southeast: up to 2.9
Upper Midwest: up to 3
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Filterer
Engulfer / Predator
Scraper / Grazer
MOVEMENT
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-erosional
Diagnostic Characters
+ Expanded Character List
Order: Wings and wing pads absent. Eye spots sometimes visible, but compound eyes absent. Segmented legs absent, but sometimes fleshy prolegs present. Sometimes with distinct head, often without head or with head drawn deeply into thorax. Body flattened, cylindrical, or maggot-like.
Family: Mandibles move against each other along a horizontal or oblique plane. Head complete, fully exposed, distinct from thorax, and usually without lengthwise incisions. Head capsule usually with pair of conspicuous fans. Prothorax with single proleg ventrally. Thoracic segments usually individually distinguishable. Posterior abdominal segments 5–8 swollen, with ballooned or bowling-pin appearance. Last abdominal segment ringed with several radiating rows of small hooks. Mature larvae usually 3–8 mm long, or greater.
Genus: Not defined.