In any primitive group of animals, there is an unusual interest attached to any organ which shows a simple structure, as having a possible bearing upon the history of the organ in a more highly specialized condition, as found in higher, closely related groups. Sometimes organs of seemingly simple structure are very puzzling from the fact that we are at a loss to determine whether their condition is primitive, or is due to degradation or partial atrophy. Embryological studies are often of value in determining the case, But not always. In entomology we have surprisingly few embryological studies which are specific enough to guide us in such determinations. When a group of insects varies widely however, in relation to any specified structure, a comparative study of its adult condition in the different members of the group may be of value.
Proceedings of the Iowa Academy of Science
©1906 Iowa Academy of Science, Inc.
Guthrie, J. E.
"Studies of the Collembolan Eye,"
Proceedings of the Iowa Academy of Science, 13(1), 239-243.
Available at: https://scholarworks.uni.edu/pias/vol13/iss1/36