Examples
Orders
Mayflies
Ephemeroptera
Dragonflies Odonata
Stoneflies
Plecoptera
Examples
Orders
Lacewing
Neuroptera
Beetles
Coleoptera
Scorpionfly
Mecoptera
Coddisfly
Trichoptera
Moths,
Butterflies Lepidoptera
Flies
Diptera
Fleas
Siphonaptera
Wasps, Bees
Hymenoptera
Insect Morphology and Systematics
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52
TYPES OF LARVAE AND PUPAE
EGGS
The first stage of development in all insects is egg. Majority of insects are oviparous.
Egg stage is inconspicuous, inexpensive and inactive. Yolk contained in the egg supports the
embryonic development. Eggs are laid under conditions where the food is available for feeding
of the future youngones. Eggs are laid either individually or in groups. The outer protective shell
of the egg is called chorion. Near the anterior end of the shell of the egg, there is a small
opening called micropyle which allows the sperm entry for fertilization. Chorion may have a
variety of textures. Size and shape of the insect eggs vary widely.
Types of eggs
a) Singly laid
1) Sculptured egg:
Chorion with reticulate markings and ridges. Eg: castor
butterfly
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