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Family Perlodidae - Perlodid Stoneflies

Perlodid stonefly, Isoperla holochlora - Isoperla Perlodid stonefly, genus Diploperla - Diploperla Perlodid stonefly, genus Diploperla - Diploperla Isoperla namata Green-winged Stonefly - Isoperla richardsoni Cultus verticalis - female Isoperla pinta Skwala
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Plecoptera (Stoneflies)
Superfamily Perloidea
Family Perlodidae (Perlodid Stoneflies)
Synonyms and other taxonomic changes
includes Isoperlinae
Numbers
2 subfamilies with ~130 spp. in 30 genera in our area(1) [114 in the lower 48 states(2)] and >300 spp. in 53 genera worldwide(3)
Size
adults usually 10-15 mm (up to 25 mm)
Identification
adults of Isoperla species commonly have yellowish or greenish bodies as well as greenish wings; species in other genera are brown or black; pronotum rectangular with corners narrowly rounded; anal lobe of hindwing well developed and with 5 or more veins reaching the wing margin behind vein 1A; adult males of most genera except Arcynopteryx have a lobe on the seventh sternite
nymphs have hind wing pads that protrude at an angle from the body's axis, and the body is pigmented in a distinct pattern; cerci longer than length of abdomen; paraglossae extend beyond the glossae; thoracic gills - if present - either single or double but not profusely branched
Range
holarctic + Oriental; throughout NA(3), although species diversity is greater in mountainous areas of n. US and so. Canada; many spp. have restricted ranges
Habitat
nymphs live in a wide variety of flowing water habitats, from small streams to large rivers
adults are often found resting or crawling on foliage near water where nymphs developed
Season
spring or spring and summer, depending on genera/species
Food
nymphs prey on small aquatic invertebrates
some adults feed on pollen
Remarks
adults of Isoperla are diurnal