1. CRUSTACEA

2. • Phylum Arthopoda
• Subphylum Crustacea
• 30,000 species
• Mostly marine

3. Examples of Crustaceans
Crabs

4. Examples of Crustaceans
Shrimp

5. Examples of Crustaceans
Lobster

6. Examples of Crustaceans
Barnacles

7. Examples of Crustaceans
Copepods – 70% of all Crustaceans

8. Examples of Crustaceans
Krill – greatest biomass of any species on earth

9. Examples of Crustaceans
Isopods

10. Examples of Crustaceans
Amphipods

11. ANATOMY
• Anatomy varies depending on type of
crustacean
• Body divided into two major parts:
Cephalothorax – head and main body cavity
Abdomen – muscular, segmented dorsal part of
body
• Usually 16 – 20 body segments
• Carapace – shell covering cephalothorax

12. cephalo
thorax
ab
do
m
en
carapace

13. ANATOMY
• Many specialized, jointed appendages:
– Gills – usually underneath for breathing
– Walking legs - pereopods
– Swimming legs - pleopods
– Feeding appendages
• maxillipeds and mandibles - mouthparts
• chela - claws
– Sensing - antennae
– Defense
– Tail – telson and uropods

14. antennae eye
shrimp anatomy
telson
chela uropods
gills pleopods
pereopods

15. crab anatomy –
dorsal view
chela eye
antenna
carapace walking legs
swimming
legs abdomen

16. mandibles eye
chela
crab anatomy –
ventral view
abdomen

17. Crustacean Feeding
• Methods vary:
• Predators and scavengers – crabs and lobsters
• Filter feeders – barnacles
• Parasites – isopods (fish lice), whales
barnacles

18. Crustacean Reproduction
• Separate sexes
• Males release sperm packet
using modified appendages
• Females mate during molting –
hold sperm packet until
fertilization
• Females carry fertilized eggs
under abdomen until hatching

19. Crustacean Life Cycle
• Meroplanktonic larvae

20. Other Facts
• Largest – king crab – legspan of 12 feet
• Heaviest – 48 pound lobster