eastern dobsonfly hellgrammite - corydalus cornuttus

insect animal invertebrate arthropod green leaf moth beetle nature pest wildlife fly flower butterfly eastern dobsonfly hellgrammite corydalus cor cornuttus close isolated found housatonic river connecticut anglers animal aquatic bait bite brown bug coloration connecticut conservation control cornutus corydalus creepy dobsonfly eastern environmental fishing go-devil grampus harmless helgamite hellgrammite hojack housatonic identification industry insect invertebrate isolated kent larval legs lure mandibles misconception nuisance pattern pest pinchers popular river scary segmented species stage streams water