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Transcript
Arthropods
Chapter 13 Section 3
Arthropods
 Jointed
appendages,
 Bilateral symmetry
 Segmented bodies
 Exoskeleton
 Body cavity
 Digestive system with two openings
 Nervous sytsem
 MOST have separate sexes (not
hermaphrodites)
Arthropods
 Some
many segments, others have fused
segments forming body regions
A
hard, thick, outer covering called an
exoskeleton covers, supports, and
protects the arthropod, it is shed and
replaced occasionally in a process called
molting
Insects
3
body regions
Insect body regions
 An
insect’s head has a pair of antennae,
eyes, and a mouth
 The thorax has three pairs of legs; if the
insect has wings, they are attached to the
thorax
 The abdomen contains reproductive
structures and an open circulatory system;
insects obtain air and release waste gases
through openings called spiracles
Metamorphosis
 Series
of body changes as insects
become adults
Incomplete metamorphosis
 Egg,
nymph adult
Complete metamorphosis
 Egg,
larva, pupa, adult
Metamorphosis
 Insects
eat plants, blood of animals,
nectar, decaying materials, wood, and
clothes; mouth parts are diverse and
adapted to diet
 Insects
are successful due to their
exoskeletons, ability to fly, rapid
reproductive cycles and small sizes
Arachnids
 Spiders
and ticks have two body regions
(the cephalothorax and abdomen), four
pairs of legs, and no antennae
Scorpions
 Sharp,
poison-filled stinger at the end of
their abdomen
Spiders
 Inject
their prey with enzymes to digest it.
Mites and Ticks
 Generally
diseases
parasites; ticks often carry
Centipedes and millipedes
 Long
bodies with many segments, many
legs, antennae, and simple eyes
Crustaceans
 Crabs,
shrimp, and barnacles have one or
two pairs of antennae and mandibles for
crushing food
What arthropods can do!
 Food
source
 Aid in agriculture, important part of
ecological communities in which humans
live
 BAD

 Some are pests that carry disease or
damage property
Insecticides
 Can
kill insects, but cause other
environmental problems; biological
methods for controlling insects are being
developed
Arthropod fossils
 Some
fossils are more than 500 million
years old
 Probably
evolved from a segmented
worm ancestor.