“Aquatic Caterpillars, Snout Moths”
“Alderflies, Dobsonflies, and Fishflies”
“Dragonflies and Damselflies”
“Primitive Minnow Mayflies”
19 species in North America. Not commonly collected. Can be confused with other families of mayflies like Baetidae and Ameletidae. The genus is noted by the double lamellae of the gills. Typically found in slower to almost no current depositional habitats of streams and rivers.
Southeast: 2.6 and higher
Upper Midwest: 7 and higher
Collector / Gatherer
Widespread (east of the Rocky Mtns.)
Single Tarsal Claw
Usually 3 Tails
3 "Tails" Subequal
Distal Margin of Labrum Straight
Gills on 1-7 Plate-like
Gills on segment 1 and 2 with double gills
+ Expanded Character List
Order: Wings developing in wing pads. Mouthparts suitable for chewing. Gills present on tops and sides of abdomen. Segmented legs present. One tarsal claw per leg. Usually with 3 tails (sometimes 2).
Family: The labrum (upper lip) is not notched in the middle; the antennae are shorter than twice the width of the head; the maxillae on the underside of the head lack prominent rows of golden spines; the abdominal gills are rounded and similar to each other in structure; 3 long slender filaments at the end of the body are about equally long.
Genus: Double lamellae gills, mid sized mayfly, very patterned, antennae short