1 Metamorphosis refers to the way that certain

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* Metamorphosis refers to the way that certain organisms develop, grow, and change form. 2

1. Ametabolous- no metamorphosis 2. Hemimetabolous- incomplete 3. Holometabolous- complete 3

Insects show no metamorphosis. Here the adult looks like the immature except for the presence of genetalia and gonads. The silverfish is an example 4

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* In these insects, the nymph more or less resembles the adult and there is no pupal stage. Examples: plant bug, crickets, true bugs, termites, grasshoppers, and cockroaches. 6

1. Egg 2. Nymph 3. Adult 7

1. Paurometabola- gradual metamorphosis e. g. Cockroach 8

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2. Emimetabola 10

* Larvae and adults of these insects are very different and a distinct pupae is formed. Examples: beetles, flies, bees, lacewings, butterflies, ants, and caddis flies. 11

1. Egg 2. Larvae 3. Pupa 4. Adult 12

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Adult Eggs Larvae Pupa Adult 14

1. Eggs egg case of a cockroach 15

Eggs of Grasshopper 16

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Hatching insect egg 19

2. Larvae a. Polypod 20

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b. Oligopod b. 1 Scarabaiform * C-shaped body * 3 pairs of thoracic legs * e. g. , dung beetles 22

b. 2 Campodeiform * Flattened body 23

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c. Apodus c. 1 Eucephalous 25

c. 2 Hemicephalous 26

c. 3 Acephalous e. g. , Musca domestica 27

3. Pupa a. Obtect pupa e. g. , butterflies 28

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b. Exarate pupa e. g. , beetles 30

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c. Coarctate pupa 32

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d. Active pupa e. g. , mosquito 34

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