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| Two-winged insects characterized by active flight. |
Flies are well adapted for aerial movement, and
typically have short and/or streamlined bodies.
The second segment of the thorax, which bears the
wings and contains the flight muscles, is greatly
enlarged, with the other two segments being reduced
to mere collar-like structures. The third segment
bears the halteres, which help to balance the insect
during flight. A further adaptation for flight is
the reduction in number of the neural ganglia, and
concentration of nerve tissue in the thorax, a feature
that is most extreme in the highly dervied Muscomorpha
infraorder... |
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