1. VII. Phylum of Invertebrates: ARTHROPODS

3. Arthropods are the most successful animals!
WHY?
They are found in many environments.
They can ADAPT to many environments.

4. VII. Phylum: Arthropoda Characteristics:
Arthropoda means
arthro- jointed pod- foot
2. Appendages grow from the body
3. The body is divided into three segments:
a. Head ~ 1st part, contains the sense organs
b. Thorax ~ middle, joins head & abdomen
walking legs are attached here
c. Abdomen ~3rd part, reproductive & digestive organs are found here

5. 4. All arthropods have an external skeleton called the exoskeleton.
The exoskeleton has several functions:
a. covers
b. supports
c. protects
d. prevents from drying out
Arthropods molt their exoskeleton.

6. 5. Molting is a process of shedding the exoskeleton and replacing a new one in order to grow. What problems do you see with this process?

7. Class ~ Crustacean

8. Types of Crustaceans Crabs Lobsters Shrimp Pill bug Barnacles
Water fleas

9. Characteristics a. Two body parts:
i. Cephalothorax- head & thorax fused together
ii. Abdomen
One or two pairs of antennae- taste, touch, smell,
balance
c. Mandibles ~ jaws used for crushing food

10. e. Swimmerets ~ appendages on the abdomen
d. Five pairs of legs:
i. 1st pair~ claws- catching food, protection
Four pairs of walking
e. Swimmerets ~ appendages on the abdomen
Movement
Reproduction
Respiration- Force water over the gills
f. Regeneration ~ swimmerets will grow back

11. g. CRAYFISH A common crustacean
h. Compound eyes ~ located at the end of the eyestalks
Why is this an advantage?

12. External Anatomy of the Crayfish
Rinse crayfish
Locate the external structures and label on the diagram
Answer the questions as you observe the crayfish.
Cleans tray and tools!

14. Class ~ Insecta

15. Insects: Largest class of Arthropods
2. Most successful animals:
reproduce in mass numbers
lives in many environments

16. Characteristics of Insects:
3 body parts: head, thorax, abdomen
b. Mandible- specialized mouth part
c. Antenna or feelers for touch or smell
1 or 2 pairs of wings
3 pairs of legs
Reproduction- sexual
Complete metamorphosis
Incomplete metamorphosis

17. e. Grasshopper Most common insect Two types of eyes- simple & compound
3 pairs of legs:
1st two pairs- walking
3rd pair- jumping

18. Grasshopper (cont.)
iii. two pairs of wings iv. spiracles- found on the abdomen for respiration/breathing v. Reproduction- sexual

19. vi. Metamorphosis
A series of distinct changes in form through which an organism passes as it develops from an egg to an adult.
Incomplete (3 stages): Ex: Grasshopper, termites, lice
egg- nymph-adult
Complete Metamorphosis (4 stages): butterflies, beetles,
ants
egg- larva–pupa-adult

22. Grasshopper Lab Label: Head, thorax, abdomen
Forewing, hindwing
Antenna
Simple eye, compound eye
Mandible
Jointed legs
Tympanum
Spiracles
External & Internal Anatomy

23. *Insect Mouth Parts *What am I? (partner challenge)
Homework:
Grasshopper Lab due Tuesday
Arthropod Quiz: FRIDAY

24. Class ~ Arachnid

25. Characteristics a. Two body parts: b. no antennae
Cephalothorax: head & thorax fused together
Abdomen
b. no antennae
c. four pairs of legs
d. poison glands, stingers or fangs
e. four pairs of simple eyes

26. Fangs, Chelicerae of Zebra Jumping Spider Salticus scenicus
Spider Chelicerae
Fangs and Chelicerae of Tarantula Spiderling Brachypelma smithi (Mexican Red-Knee Tarantula)
Fangs, Chelicerae of Zebra Jumping Spider Salticus scenicus

27. SPIDERS f. A common arachnid- spider
i. Eight simple eyes to sense light and darkness
ii. Cannot chew food ~ inject poison into their prey which paralyzes it and then turns the food into liquid
iii. Book lungs ~ series of flat, air filled plates used in respiration
iv. Spiracles~ openings in the abdomen that allow oxygen in and carbon dioxide out

28. Some arachnids are parasites!
TICKS
Lyme Disease
MITES
House dust mites
Eyelash mites

29. G. Class: Centipede 1. 1 pair of legs per body segment
usually a flat body
1 pair of antenna
feed on insects and spiders
move fast
2. Eat other animals- carnivores

30. H. Class: Millipede 1. 2 pairs of legs per body segment rounded body
1 pair of antenna
feed organic matter- leaves and wood
move slow
2. Eat plants- herbivores

31. 5 Arthropod Review How many classes of Arthropods? Name the classes
Crustaceans
Insects
Arachnids
Centipedes
Millipedes

32. Body regions
Which class(es) have 3 body regions: head, thorax, abdomen?
Insects
Which class(es) have 2 body regions: cephalothorax & abdomen?
Crustaceans
Arachnids

33. Name the stages of Metamorphosis:
Complete:
Egg
Larva
Pupa
Adult
Incomplete
Egg
Nymph
Adult