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Leptohyphidae
'Little Stout Crawler Mayflies'.
Characterized by operculate triangular gills located on the 2nd abdominal segment.
Typically measure less than 10 mm in length.
Ephemeridae
'Burrowing Mayflies'.
Identified by upward facing tusks, which assist in burrowing.
Have feathery gills along the abdomen and a 'U' shaped projection on the front of the head.
Usually measure between 12-20 mm.
Caenidae
'Small Square-gilled Mayflies'.
Feature very small sizes with large operculate square wingpads that meet medially.
Often possess spines on the protibia and protarsus.
Isonychiidae
'Brush-legged Mayflies'.
Exhibit a minnow-like body shape that is long and ovular.
Have feathery gills that spread laterally and long spines adorning the forelegs.
Baetiscidae
'Armored Mayflies'.
Notable for a large armored backplate that covers most of the abdomen, serving as protection.
Characteristically small in size.
Baetidae
'Small Minnow Mayflies'.
Feature very long antennae, small round ventral gills, and minnow-like body shapes.
Distinguished by a notch on the labrum.
Potamanthidae
'Hackle-gills'.
Feature pronounced, straight, or downcurved tusks on the head.
Have forked long sharp gills on segments 2-7 and possess slender legs.
Heptageniidae
'Flat-headed Mayflies'.
Characterized by a flat head that protrudes laterally
Typically possess small gills along each side and may have only two cerci at the rear.
Flat-headed Mayflies
Heptageniidae
Hackle-gills
Potamanthidae
Small Minnow Mayflies
Baetidae
Armored Mayflies
Baetiscidae
Brush-legged Mayflies
Isonychiidae
Burrowing Mayflies
Ephemeridae
Small Square-gilled Mayflies
Caenidae
Little Stout Crawler Mayflies
Leptohyphidae
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