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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”
Ephemeroptera
family
Ameletidae
“Comb-mouthed Minnow Mayflies”
Baetidae
“Small Minnow Mayflies”
Baetiscidae
“Armored Mayflies”
Caenidae
“Small Square-gilled Mayflies”
Ephemerellidae
“Spiny Crawler Mayflies”
Ephemeridae
“Burrowing Mayflies”
Heptageniidae
“Flat-headed Mayflies”
Isonychiidae
“Brush-legged Mayflies”
Leptohyphidae
“Little Stout Crawler Mayflies”
Leptophlebiidae
“Prong-gilled Mayflies”
Metretopodidae
“Cleft-footed Minnow Mayflies”
Polymitarcyidae
“Pale Burrower Mayflies”
Potamanthidae
“Hackle-gills”
Siphlonuridae
“Primitive Minnow Mayflies”
Heptageniidae
genus
Epeorus
Heptagenia
Leucrocuta
Maccaffertium
Rhithrogena
Stenacron
Heptagenia
“Flat-headed Mayflies”
Genus Overview
11 species in North America.  This genus seems to prefer flowing current and can be collected on various substrate such as logs, boulders, other debris exposed.  One species, Heptagenia culacantha, is endemic to the Susquehanna River. 
Characteristics
POLLUTION TOLERANCE
Southeast: 2.4 and higher
Upper Midwest: 3 and higher
Midwest: 1.9 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Gatherer
Scraper / Grazer
MOVEMENT
Clinger
Swimmer
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-erosional
Diagnostic Characters
Order
Abdominal Gills
Single Tarsal Claw
Usually 3 Tails
Family
Flat Head And Body
Margin Around Eyes
+ Expanded Character List
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No iNaturalist images found.
Dorsal
Ventral