Download - Insect Wing
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ENT 101 (Lecture 5)
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Wing Venation
archedictyon - name given to a hypothetical scheme of wing venation proposed for the very first winged insect
based on a combination of speculation and fossil data Since all winged insects are believed to have evolved from a
common ancestor, the archediction represents the "template" that has been modified (and streamlined) by natural selection for 200 million years
according to current dogma, the archedictyon contained 6-8 longitudinal veins.
these veins (and their branches) are named according to a system devised by John Comstock and George Needham
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The Comstock-Needham System
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The Comstock-Needham System
Costa (C) -- the leading edge of the wing
Subcosta (Sc) -- second longitudinal vein (behind the costa), typically unbranched
Radius (R) -- third longitudinal vein, one to five branches reach the wing margin
Media (M) -- fourth longitudinal vein, one to four branches reach the wing margin
Cubitus (Cu) -- fifth longitudinal vein, one to three branches reach the wing margin
Anal veins (A1, A2, A3) -- unbranched veins behind the cubitus
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Wing Venation…
Names of crossveins are based on their position relative to longitudinal veins:
c-sc (crossveins run between the costa and subcosta)
r (crossveins run between adjacent branches of the radius)
r-m (crossveins run between the radius and media)
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Insect Jar Preparation
Insect Net Making
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Studying Insect Parts
Preparing for the Recitation
that’s all for now, folks!