Arthropods
Chapter 10
Arthropods
• 1. What phylum do spiders,
grasshoppers, lobsters and centipedes
all belong to?
ARTHROPODA
Arthropods
• 2. “arthros” mean “jointed”
• 3. “podos” means “foot” or “leg”
Molting
• Molting: Shedding
of the exoskeleton
–Insects shed
their outer
skeleton to grow
–Skin not flexible
like ours
Characteristics of Arthropods
4. Arthropods share four main
characteristics:
A. Exoskeleton (or outer shell)
i. Prevents evaporation
of water
ii. Used for protection
Characteristics of Arthropods
4. Arthropods share four main
characteristics:
B. Segmented Bodies
i. Arthropods can have up to three
sections
ii. Head, Thorax and Abdomen
Characteristics of Arthropods
4. Arthropods share
four main
characteristics:
C. Jointed
Appendages
i. Examples: Legs,
wings and arms.
ii. Give animal
flexibility
Characteristics of Arthropods
4. Arthropods share
four main
characteristics:
D. Diversity
i. Scientists have
discovered over one
million species
Crustaceans
5. Crustaceans share three main body
structure features:
a. Two or three body sections
b. Five or more pairs of legs
c. Two pairs of antennae
Crustaceans
6. What are chelipeds used for?
Used to capture prey and to defend itself
Obtaining Food and Oxygen
7. Crustaceans
obtain oxygen by
gills.
Located beneath
the shell of the
crustacean
Obtaining Food and Oxygen
8. Crustaceans obtain food
by:
a. Scavengers: Eats dead
plant and animals
b. Herbivores: Eating
plants
c. Predators: Eating
animals they have
killed
Crustacean Life Cycle
9. Most crustaceans begin theirs lives as
microscopic, swimming larvae.
Metamorphosis
10. The change in shape
and habits of an insect
as it grows into an
adult.
Arachnids
11. Arachnids are
arthropods with:
a. Two body sections
b. Four pairs of legs
c. No Antennae
Arachnids
12. Some examples of arachnids
include ticks, mites and spiders.
13. All spiders
are carnivores.
Centipedes & Millipedes
14. All centipedes and
millipedes have:
a. Two body sections
b. One pair of
antennae
c. Long abdomen
Centipedes & Millipedes
15. What’s with the names?
- “millipede” means “thousand feet”
- “centipede” means “hundred feet”
NO SIGNIFIGANCE!
Insects
16. Body Structure: All
insects…
a. Three body sections
b. Six legs (3 pairs)
c. One pair of antennae
d. Usually one or two
pairs of wings
17. Three sections of insect body:
a. Head
b. Thorax
c. Abdomen
18. What’s being described?
a.
b.
c.
d.
e.
Internal organs found in
Where legs are attached
Includes sense organs
Small holes for breathing
Where wings are attached
Insects
19. An insect’s mouthparts
are adapted for a highly
specific way of getting
food.
20. Examples:
1. Coiled up tube
2. Sponge like tongue
Insects
21. Chewing mouth parts can be found
on:
Grasshoppers, dragonflies and ant.
The change
in shape
and habits
of an insect
as it grows
into an
adult.
Insect is COMPLETELY changed
Step #4: Insect
Fully developed
Step #1: Egg laid
Step #3: Pupa formed
Step #2: Egg hatches into larva
Insect
looks like
miniature
adult
Step #1: Eggs laid
Step #4: Insect
Fully equiped
Step #3:
Nymph
grows and sheds
exoskeleton
Step #2: nymph hatches and grows
Metamorphosis
24. Nymph: Young form of adult
with incomplete
metamorphosis; miniature
adult
25. Larva: The young form of an
insect with complete
metamorphosis
Metamorphosis
26. Nymph’s typically
eat the same food as
adult because they
look just like the
adult.
Same mouthparts
just smaller