Eastern Dobsonfly facts and data. Know Eastern Dobsonfly weight-reduction plan, habitat, taxonomy, and many others See attention-grabbing facts of Eastern Dobsonfly in our animal facts archive.
English: Hellgrammite, toebiter, bass bait (larva); French: Grande mouche Dobson (grownup).
Hemerobius cornutus Linneus, 1758, Pennsylvania.
The grownup is 2 in (50 mm) lengthy, with a wingspan up to 5 in (125 mm), and the larva is 2.6 in (65 mm) lengthy. The head is nearly round and the prothorax sq. and barely narrower than the pinnacle. The wings are translucent grey with darkish veins and cells with white spots. The mandibles of the male are so long as half of the physique size, curved and tapering to the tips and held crossing one another. The mandibles of the feminine are shorter.
Occur east of the Rocky Mountains within the United States and Canada.
Larvae dwell in fast-flowing water.
Adults are nocturnal and secretive and are seldom seen throughout the daytime, after they cover beneath leaves within the cover of bushes. Larvae have been seen swimming ahead or backward in a snakelike fashion, however they normally crawl.
FEEDING ECOLOGY AND DIET
Adults don't feed; larvae eat different bugs and small invertebrates.
Mating conduct is stereotypical; males flutter their wings, show genital appendages, and struggle over females. Rounded plenty containing 100–1,000 or extra eggs are laid on rocks, branches, and objects shut to the water. Each mass is coated with a whitish secretion. Larvae drop into the water or crawl to attain feeding grounds. After two or three years, they crawl out of the water and put together pupal chambers beneath stones or logs, the place they overwinter. Adults emerge in early summer season.
SIGNIFICANCE TO HUMANS
Fishermen use dobsonfly larvae, referred to as hellgrammites, as bait for trout, largemouth bass, catfish, and different fishes. Hellgrammites additionally assist management populations of pest aquatic bugs, such because the Asian tiger mosquito.