ENVS 2210 Lecture Notes - Lecture 4: Ecdysone, Funeral Director, Insect
9 Nov 2016
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Has 2 subclasses, the holometabola and the hemimetabola. Honey bees are holometabolous insects b/c they pass through complete metamorphosis (transformation). Four stages w/ different developmental times: egg, larva, pupa, and adult. Queen lays eggs in wax cell, worker feeds hatched larva, larva reaches full growth, worker seals cell, larva becomes a pupa, adult bee leaves cell. Egg, larva, pupa and adult are the first three stages are known as brood; each stage has a different developmental time. Stage 1: the egg; 3 days for the three castes. Contains an embryo and nutrients for its development. Embryo develops into a larva in three days; after 3 days, larva hatches = bee is born. Nucleus divides and form cleavage cells that become the blastoderm. Stage 2: larva; 5. 5- 6 and 6. 5 days for queen, worker and drone, respectively. During the larval stage, individuals pass through five instars (sub- stages), moulting (changing exoskeleton) while growing between instars (growth by step-wise increments).
