Emergent-aquatic-insect
Guides
Allocapnia
winter stoneflies
Allocapnia is a genus of small winter stoneflies in the family Capniidae, comprising at least 40 described species. Adults emerge during winter months, typically from December through March. Nymphs inhabit stream substrates and exhibit vertical movement within the hyporheic zone, often retreating to deeper substrate during summer diapause and returning to surface layers in autumn.