Insects - Metamorphosis
Metamorphosis refers to the way that insects develop, grow, and
change form. Metamorphosis actually means "change". There are two
types of metamorphosis--incomplete and complete.
Incomplete Metamorphosis
About 12% of all
insects go through incomplete metamorphosis. Incomplete metamorphosis has 3
stages.
· Egg - A female insect lays eggs. These eggs are often covered
by an egg case which protects the eggs and holds them together.
· Nymph - The eggs hatch into nymphs. Nymphs
looks like small adults, but usually don't have wings. Insect nymphs eat the
same food that the adult insect eats. Nymphs shed or molt their exoskeletons
(outer casings made up of a hard substance called chitin) and replace them with
larger ones several times as they grow. Most nymphs molt 4-8 times.
· Adult - The insects stop molting when they
reach their adult size. By this time, they have also grown wings.
Complete Metamorphosis
About 88% of all
insects go through complete metamorphosis. Complete metamorphosis has 4 stages:
· Egg - A female insects lays eggs.
· Larva - Larvae hatch from the eggs. They
do not look like adult insects. They usually have a worm-like shape.
Caterpillers, maggots, and grubs are all just the larval stages of insects.
Larvae molt their skin several times and they grow slightly larger.
· Pupa - Larvae make cocoons around
themselves. Larvae don't eat while they're inside their cocoons. Their bodies
develop into an adult shape with wings, legs, internal organs, etc. This change
takes anywhere from 4 days to many months.
· Adult - Inside the cocoon, the larvae
change into adults. After a period of time, the adult breaks out of the cocoon.