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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”
Polymitarcyidae
genus
Ephoron
“Pale Burrower Mayflies”
Genus Overview
2 species in North America (Ephoron leukon and Ephoron album).  The differences in the two species is the lateral tracheal branches in the gills.  This burrowing mayfly is smaller than the other families of burrowers. 
Characteristics
POLLUTION TOLERANCE
Southeast: 1.5 and higher
Upper Midwest: 2 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Filterer
Collector / Gatherer
MOVEMENT
Burrower
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lentic-littoral
Lotic-depositional
Lotic-erosional
Diagnostic Characters
order
Abdominal Gills
Single Tarsal Claw
Usually 3 Tails
family
Gills on 2-7 Forked, Long, Curving over Abdomen
Legs Flattened or Tuberculate
Long Tusks Straight or Downcurved
​Hind Tibiae Rounded Apically
+ Expanded Character List
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Dorsal
Lateral