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 aquatic bait bite brown bug coloration conservation control cornutus creepy environmental fishing go-devil grampus harmless helgamite hojack identification industry kent larval legs lure mandibles misconception nuisance pattern pinchers popular scary segmented species stage streams water