A

 

Document Type

Book

Journal/Book Title/Conference

Developmental Systems: Insects

Volume

1

Publisher

Academic Press

Publication Date

1-1-1972

First Page

165

Last Page

242

Abstract

The eggs of hemimetabolous insects, (cf Chapter 3), pose a number of technical problems for the descriptive embryologist. Holometabolous insects are in many ways more suitable for embryological investigation. The Holometabola are generally more prolific and more amenable to laboratory culture than the Hemimetabola. The eggs of most holometabolans develop relatively rapidly (Table I) and have smaller dimensions (Table II), less yolk and less formidable external membranes than their hemimetabolous counterparts. Consequently, good histological preparations of all stages can usually be obtained with relative ease. In spite of these advantages, however, the Holometabola were still a frustrating challenge to the insect embryologists of the nineteenth century, who found difficulty, not only with histological manipulations of their specimens, but also because the embryos of many Holometabola manifest extremes of specialization which the early workers were unable to interpret.

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