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Genus Overview
This common and widespread genus includes about 39 species in North America. Larvae live on sediments and detritus in lotic-erosional (fast-water) habitats, where they are efficient swimmers and are clingers and sprawlers on the substrate. The feed as collectors-gatherers on coarse detritus and diatoms, occasionally shredding larger detritus. Fly fishers know different species as Blue Quills and Mahogany Duns.
Characteristics
POLLUTION TOLERANCE
Southeast: 1.2 and higher
Upper Midwest: 1 and higher
Midwest: 2.8 and higher
Mid-Atlantic: 1 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Gatherer
Shredder / Detritivore
MOVEMENT
Clinger
Sprawler
Swimmer
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-erosional
Diagnostic Characters
+ Expanded Character List
Order: Wings developing in wing pads. Mouthparts suitable for chewing. Gills present on tops and sides of abdomen. Segmented legs present. One tarsal claw per leg. Usually with 3 tails (sometimes 2).
Family: Mandibular tusks absent. Gills on abdominal segment 1 with single or double lamellae (plates) or forked. Gills on segments 2–7 double-layered lamellate (plate-like) and terminated in filaments or points and without fringe, or oval with fringe.
Genus: Labrum with shallow, median notch along distal margin. Abdominal gills on segments 1–7 of similar shape, forked, but those on first segment slightly smaller. Tusks absent. Mesonotum without anterolateral lobes of Neoephemeridae. Hind wing pads absent. Gills on abdominal segment 2 four-sided, and meeting or almost meeting medially (but NOT fused), and at least partially covering succeeding pairs (semioperculate). Plate-like gills on abdominal segments 3–6 with fringed borders. Mature larvae 2–8 mm in length, not including tails.