1. metamorphosis
metamorphosis

2. growth and development of an insect undergoes during its
METAMORPHOSIS
It is the change in
growth and development
of an insect undergoes during its
life cycle from birth to maturity

3. types of metamorphosis
There are four basic
types of metamorphosis
in insects.
No metamorphosis
Gradual metamorphosis
(Paurometabola)
Incomplete metamorphosis
( hemimetaboa)
Complete metamorphosis

4. Ametabola (No metamorphosis)
e.g. Silver fish

5. Life stages
young one
adult
Egg

6. It is most primitive type of metamorphosis.
The hatching insect resembles the adult in all
respects except for the size.

8. (Incomplete metamorphosis)
Hemimetabola
(Incomplete metamorphosis)
e.g. Dragonfly, damselfly and mayfly

9. Life stages
naiad
adult
Egg

10. The young ones are aquatic and are called naiads
They are different from adults
They breath by means of tracheal gills
The lower lip is called mask, which is hinged
and provided with hooks for capturing prey
Their habit and habitat vary.
After final moult, the insects have fully
developed wings suited for aerial life

13. (Gradual metamorphosis)
Paurometabola
(Gradual metamorphosis)
e.g. Cockroach

14. Life stages
Egg
nymph
adult

15. The young ones are called nymphs
They are terrestrial
They resemble the adults in general body form
Their compound eyes and mouth parts are similar
to that of adults

16. Both nymphs and adults share the same habitat
They lack wings and external genitalia
Wing buds externally appear in later instars
The genitalia development is gradual
Later instar nymphs closely resemble the adult
with successive moults

19. Fig

20. (Complete metamorphosis)
Holometabola
(Complete metamorphosis)
e.g. Butterfly and moth

21. larva
pupa
Egg
adult

22. Majority of insects undergo complete metamorphosis
Larva of butterfly is called caterpillar
Larva differs greatly in form from adult.
Compound eyes are absent in larva
Lateral ocelli or stemmata are the visual organs.

23. Their mouth parts and food habit differ from adults
Wing bud development is internal
When the larval growth is completed, it is followed by
a period of in activity (prepupa) and transforms into
pupa
In the pupal stage, the larval tissues disintegrate and
adult organs are built up

29. Hypermetamorphosis
Blister beetle

30. Triangulin
Pupa
Grub
Life stages
adult
Egg

31. Common in hemi and holometabolous insects
More than one larval stage is common