Crane Fly (Green) Family:Tipulidae
Kingdom: Animalia|
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Suborder: Nematocera
Infraorder: Tipulomorpha
Superfamily: Tipuloidea
Family: Tipulidae
Green Cranefly
Halteres are small knobbed structures modified from the hind wings in some two-winged insects. They are flapped rapidly and function as gyroscopes, informing the insect about rotation of the body during flight. The halteres evolved from wings. The ancestral insect species had two pairs of wings (like dragonflies and most other flying insect species have). Click photo to enlarge. Once enlarged click this photo. 
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