dobsonfly
noun
dob·son·fly ˈdäb-sən-ˌflī 
: a winged insect (family Corydalidae) that has very long slender mandibles in the male and a large carnivorous aquatic larva and that is now usually considered a neuropteran compare hellgrammite
Word History
Etymology
origin unknown
First Known Use
circa 1904, in the meaning defined above