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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
Stenacron
“Flat-headed Mayflies”
Genus Overview
7 species in North America.  This genus is found in small streams to larger rivers.  Identification to species is difficult and revision is probably needed. 
Characteristics
POLLUTION TOLERANCE
Southeast: 1.7 - 7.1
Upper Midwest: 7 and higher
Midwest: 3.1 and higher
Mid-Atlantic: 4 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Gatherer
Scraper / Grazer
MOVEMENT
Clinger
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
Media
Stenacron
iNaturalist is an online social network and crowdsourced species identification platform
No iNaturalist images found.
Dorsal
Ventral