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The veins of insect wings are characterized by a convex-concave placement, such as those seen in mayflies (i.e., concave is "down" and convex is "up") which alternate regularly and by its triadic type of branching; whenever a vein forks there is always an interpolated vein of the opposite position between the two branches.
The Comstock–Needham system is a naming system for insect wing veins, devised by John Comstock and George Needham in 1898. It was an important step in showing the homology of all insect wings. This system was based on Needham's pretracheation theory that was later discredited by Frederic Charles Fraser in 1938. [1]
The veins of insect wings are characterized by a convex-concave placement, such as those seen in mayflies (i.e., concave is "down" and convex is "up"), which alternate regularly and by their branching; whenever a vein forks there is always an interpolated vein of the opposite position between the two branches.
The wings are moved by the rapid muscular contraction and expansion of the thorax. [11] The wings arise from the meso- and meta-thoracic segments and are similar in size in the basal groups. In more derived groups, the meso-thoracic wings are larger with more powerful musculature at their bases and more rigid vein structures on the costal edge. [7]
The wings have a network of veins; between the veins the wings are generally transparent, but may be partly colored. [1] In most Odonata there is a structure on the leading edge near the tip of the wing called the pterostigma. This is a thickened, hemolymph–filled and often colorful area bounded by
2. The posterior of the portion of the remigium found on insect wings. 3. The oblong sclerite at the base of the inferior margin of the hemelytron in Heteroptera. 4. The knob at the end of the stigmal or radial veins in the wings of certain Hymenoptera. club The popular (possibly to be preferred) name for the clavus of a clavate antenna. clypeus
The insect order Neuroptera, or net-winged insects, includes the lacewings, mantidflies, antlions, and their relatives. The order consists of some 6,000 species . [ 1 ] Neuroptera is grouped together with the Megaloptera ( alderflies , fishflies , and dobsonflies ) and Raphidioptera (snakeflies) in the unranked taxon Neuropterida (once known as ...
The wings are usually translucent with a slight iridescence; some have green wing veins or a cloudy brownish wing pattern. The vernacular name "stinkflies", used chiefly for Chrysopa species but also for others (e.g. Cunctochrysa ) refers to their ability to release a vile smell from paired prothoracic glands when handled.