1. Subphylum Crustacea
Phylum Arthropoda
Kingdom Animalia

2. Background
• Crabs,
• Shrimp,
• Lobster,
• barnacles,
• Copepods (70% of all crustaceans are copepods),
• Krill (largest biomass of any species on earth),
• Isopods,
• Amphipods

3. Anatomy
Jointed appendages with
specialized jobs:
Locomotion:
-Pereopods – walking legs
-Pleopods – swimming legs
Feeding:
-Maxillipeds
-Mandibles
-Chela – pincers (claws)

4. Anatomy contintued
Breathing – gills (usually under)
Sensory – antennae
Tail – telson and uropods
Body segments:
-cephalothorax (head & body cavity AKA the carapace)
and
-abdomen (muscular dorsal part of body)

5. Anatomy continued

7. Feeding
• Most predators or
scavengers
• Some filter feeders
(barnacles)
• Some parasites on fish
or whales (ex.
isopods)

8. Reproduction
• Separate sexes
• Males release sperm packet using
modified appendages
• Females mate during molting, hold
sperm packet till fertilization
• Females carry fertilized eggs under
body till hatching; fan them for oxygen

9. Life Cycle of the Crustacean

10. Statistics
• Largest crab - Japanese Spider Crab (13 feet)
• Heaviest crab - Alaskan King Crab (up to 24 pounds)
• Heaviest Crustacean – American Lobster (up to 48 pounds)