Insects and their Relatives

Insects are like arthropods because they
have a segmented body, an
exoskeleton, and jointed appendages
 They have a body divided into three
parts: the head, Thorax, and abdomen
 Three pairs of legs are attached to the
Insects, centipedes , and millipedes are
all Uniramians
 It is the group that contain more species
than all other groups of animals alive
 Uniramians have jaws, one pair of
antennae, and unbranched
 They all have very different life styles
They have more than 100 pairs of legs,
depending on the species.
 They are carnivores whose mouths
include a pair of venomous claws.
 Centipedes usually live beneath rocks or
in the soil, theses centipedes loose water
fast because of their spiracles cannot
close, therefore they cannot live in most
humid areas.
have a highly segmented body but
each millipede can bear two legs
instead of one ( diego talk’s)
 They live near dead logs and under rocks
because they feed on dead plants.
 if threatened they will roll up to a ball to
protect themselves.
 Some of them can release toxic
chemicals when they feel in danger
Insects use a multiple set of sense organs
on a everyday basis (eyes, taste, ears,
touch, and smell)for example:
 They have compound eyes that are
made up of many lenses to detect
change in movement and changes of
 They see less detailed than us but they
detect movement really fast therefore its
hard to swat a fly.
They have chemical receptors for taste
and smell on their mouth parts
 They also have it on their antenna and
legs so if they step on water it knows if it is
made up of salt or if it contains sugar
 They also have sensory hairs that detect
movement when they fly or in water
 Use saliva to break down their food
they have very developed ears to hear
sounds far above the human range
 People think that bugs do not have ears
because they cannot see it but most
insects hear better then humans do.
Insects have three pairs of legs which
depending on its species can be used to
help for walking, jumping or capturing its
 They have hooks that are used for
grasping and defense.
These insects grow and developed
through a cycle called metamorphosis
(Lester talks)
 insects hatch nothing like their parents
and feed completely different ways than
adult insects. The larva forms into a pupa
where the body is completely different
and when it emerges it looks like another
animal. Example (butterflies)
The cocoon hatches and turns the larva
into a complete different animal.
Example the butterfly which is the most
insects fly depending on their species cause
some fly slow like butterflies or fast like flies
or bees that can change their position and
speed really fast.
A dragonfly can also reach speeds as fast
as 50 kilometers an hour!
This is the circle of life for bugs.