1. -called arthropods -means jointed feet
Phylum: Arthropoda
-called arthropods
-means jointed feet

2. I. Characteristics
A. Have moveable appendages (legs)

3. B. Have bilateral symmetry (same on both sides when cut in half)
C. Have a crust or shell (called crustaceans)
1. called an exoskeleton
2. made of chitin

4. II. The body of arthropods
A. 2 main segments:
1. abdomen
2. cephalothorax- head and chest (covered by the carapace)

6. B. Legs of arthropods
1. Claws: first pair of legs
used in getting food
2. If a crustacean has 5 pairs of legs, it is called a decapod (meaning 10 feet)
C. Swimmerets: small, paddle-like appendages

7. III. Molting
A. Definition: A process by which a crustacean grows and sheds its outer covering.
B. Happens usually once a year
C. The crustacean is vulnerable shortly afterwards because shell is soft at first

8. IV. Types of crustaceans
A. Lobster
1. Basic facts
a. Are predators
b. Can also be scavengers
c. Can release a claw for protection (a new one
grows back)

9. 2. Digestion: one way digestive tract (in the mouth, out the anus)
3. Breathing: through gills
4. Circulation: 1 chambered heart
have an open circulatory system
a. No veins or capillaries
b. Blood moves in
open spaces

10. 5. Eyes: mounted on moveable stalks
6. Reproduction:
a. sexually (sperm and egg)
b. Internal:
male deposits sperm into female abdomen
c. Female carries eggs for almost 1 year
d. When larva hatch, become part of plankton population

11. B. Crabs
1. Mostly eat dead plant and animal matter (some are predators)
2. All life activities are similar to lobster

12. V. Crustacean Facts
A. The Northern Lobster
1. Live along
Rocky subtidal zones along Atlantic Coast

13. B. Spiny Lobster Does not have large claws like most lobsters
Live in waters of Gulf of Mexico and California

14. Spiny Lobster

15. C. Mole crab Has a smooth, streamlined body for burrowing in sand
Has featherlike antennae to catch microorganisms

16. D. Fiddler Crab
Males have one large and 1 small claw (looks like it is playing a fiddle)
Females have
2 small claws

18. E. Hermit Crab Does not have an exoskeleton
Finds empty shells to live in
As it grows, it
finds new shells to live in

20. F. Spider crab
Moves so slowly that algae and barnacles grow on them

21. G. Gulf Shrimp
1. grows up to 17 cm.
2. popular seafood shrimp

23. H. Mantis shrimp 1. largest, grows up to 25 cm.
2. spears prey with appendages that unfold like a jackknife

24. I. Cleaner shrimp 1. One of the smallest shrimp
2. rides on fish and eats parasites off skin
Cleaner shrimp,

25. The Banded Coral Shrimp

27. What do these animals have in common with one another?
Whale Shark
Adélie Penguin
Blue Whale
Right Whale

28. They all depend on these…

29. VI. More Crustaceans A. Krill (plankton) 1. coldwater organism
2. More than 10 legs

30. B. Copepods (plankton)
1. Most abundant
2. less than 1/2 cm. long (almost microscopic)
3. Base of the food chain (feed many other organisms)

31. C. Beach flea
1. Live among moist seaweed along the shore

32. 2. swim and crawl in coastal waters
D. Sea roach
1. looks like a pill bug
2. swim and crawl in coastal waters
3. Active at night (like the cockroach)
Pill Bug

33. C. Barnacles

34. Are sessile crustaceans that use feathery appendages to catch food (called cirri)
**Sessile: do not move about freely, stay put
Are filter feeders
Types:
a. Acorn barnacle –live along Atlantic coast
live attached to surfaces and rocks

35. b. Gooseneck barnacle- found along Pacific coast
-have long stalks for attachment

37. Barnacles on whales