There are 12 North American genera with roughly 60 species. This group is often referred to as “spring stoneflies,” however, adults of different species emerge at different times of year. The larvae tend to prefer small rivers, streams, and springs. They are often found in leaf packs, wood, or other coarse sediments. This makes sense as most of them are shredding detritivores, though some are collector-gatherers. These larvae can be easily confused with Taeniopterygidae as they both have wing pads divergent (not parallel with the body axis) but can be distinguished because the second tarsal segment of each leg of Nemouridae is much shorter in length than the first. These tend to be hairy larvae with hind legs longer than the abdomen.
Upper Midwest: 2 - 3
Southeast: 0.3 - 3.1
0 = least tolerant, 10 = most tolerant
Collector / Gatherer
Shredder / Detritivore
Two Tarsal Claws
Divergent Hind Wing Pads
Hind Legs Reach
Paraglossae And Glossae Subequal
+ Expanded Character List
Wings developing in wing pads. Mouthparts suitable for chewing. Gills digitiform and located near mouthparts, on neck, sides of thorax, or underside of base of abdomen, never on top or sides of abdomen. Two tarsal claws per leg. Only two tails (cerci).
Family:Larvae generally small (less than 12 mm long), robust, and hairy. Paraglossae and glossae about same length, suitable for shredding. Hind wing pads conspicuously divergent from body axis. First tarsal segment of each leg much longer than second. When extended, hind legs reach beyond end of abdomen.
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