ENVS 2210 Lecture Notes - Lecture 2: Unit, Endopterygota, Mesothorax

• School: University of Guelph
• Department: Environmental Sciences
• Course: ENVS 2210
• Professor: Ernesto Guzman

Document Summary

The class insecta is further divided into subclasses, the holometabola and the hemimetabola. Honey bees are holometabolous insects because they pass through complete metamorphosis (transformation). They experience a great amount of bodily differentiation through the course of their life cycle, which include four developmental stages: egg, larva, pupa and adult. The first three stages are known as brood. The egg contains an embryo and nutrients for its development. In its interior, the egg contains the cytoplasm, the nucleus and the yolk (nutritive material). The egg nucleus divides numerous times and the resulting nuclei migrate to the periphery of the egg, where they form a layer of cells (the cleavage cells) that eventually becomes the blastoderm. The blastoderm folds inwards and differentiates into various structures and organs of the larva. The embryo fully develops into a larva within a period of three days and the young larva hatches from the egg.