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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
Maccaffertium
“Flat-headed Mayflies”
Genus Overview
There are at least 16 species with larvae found in both fast and slow lotic (flowing water) habitats of North America. Fly fishers know the duns of various species as "March Browns" and "Light and Dark Cahills." Larvae are clingers in these streams and feed primarily as scrapers of attached algae, diatoms, and other biofilm, although they may simply collect fine organic particles facultatively.
Characteristics
POLLUTION TOLERANCE
No pollution tolerance ranges defined.
FEEDING HABITS
Collector / Gatherer
Scraper / Grazer
MOVEMENT
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-depositional
Lotic-erosional
Diagnostic Characters
order
Abdominal Gills
Single Tarsal Claw
Usually 3 Tails
family
Flat Head And Body
Margin Around Eyes
genus
Gills On 1–6 Truncate
Gills On 7 Slender
+ Expanded Character List
Media
Maccaffertium
iNaturalist is an online social network and crowdsourced species identification platform
Dorsal
Ventral