Common Stonefly

Scientific Name: Plecoptera (Order)

Order & Family: Order: Plecoptera (family likely Perlidae)

Size: 10 to 50 mm (0.4 to 2 inches) depending on species

Near clean, moving freshwater sources such as rivers and streams; adults often found on vegetation and structures nearby

Nymphs eat algae, detritus, or other invertebrates; adults often do not eat or consume soft plant matter and lichen

Mostly nocturnal and attracted to lights at night; they are poor fliers and spend most of their time crawling on rocks and wood

Harmless to humans as they do not bite or sting; they serve as critical indicators of high water quality and are a primary food source for fish

Identified on: 5/19/2026