Aphids in nature are normally either winged or wingless. However, it has been found that there also occur individuals which are intermediate in wing development: that is to say, some individuals have only partly formed wings and therefore are intermediate between the winged and wingless types. The production of large numbers of intermediate-winged aphids can be induced in the laboratory by artificial means such as certain combinations of light and temperature.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Stiles, K. A.
"The Order of Embryonic Determination of Several Organs in Macrosiphum solanifolii,"
Proceedings of the Iowa Academy of Science, 43(1), 393-394.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/143