1. Subphylum Crustacea
• only group of arthropods that is primarily aquatic
• examples: crayfish,lobster,shrimp, barnacles, isopods (pill bugs), crabs (not horseshoe)
Balanus Barnacles Crayfish

Mantis Shrimp
Body Structure:
•2 pairs of antennae
•carapace: Cuticle of head extends posteriorly and around sides
(Cephalothorax)
(exoskeleton = CaCO 3 calcium carbonate)

•Appendages:
1.Swimmerets: small abdominal legs
2.Cheliped: 1 st pair of walking legs; has pinching claw Deep Water Shrimp
3.Uropod: last pair; acts as rudder, jet backwards very fast!
• Respiration: Gills
• Excretion: Green glands
Yellow Crab

• Long body with many segments (flattened)
• First segment has claws
• Claws inject poison into prey
(predators!)
• *One pair of legs per segment!
• Carnivorous
Scolopendra Centipede

Millipedes-
• * Exude noxious chemicals
(defense)
• Long body with many segments
(cylindrical)
• No poison claws:
• TWO pairs of legs per segment
Yellow spotted Millipede
•Herbivores, detritivores (eat garbage)
• * Eat dead plant material

Bibliography
1.
Crayfish image- http://www.seahorseworld.co.nz/layout/crayfish.php Date visited- November
19,2007
2.
Balanus Barnacles- http://www.biosbcc.net/ocean/flhi.htm Date visited- November 19,2007
3.
Mantis Shrimp- http://www.galaxy15.com/mantis-shrimp.html Date visited- Novemeber 19,
2007
4.
Yellow Crab & Deep Water Shrimphttp://www.curator.org/LegacyVMNH/WebOfLife/Kingdom/P_Arthropoda/ClassCrustacean s/crustaceans.htm Date visited- November 20, 2007
5.
Centipede- http://www.britannica.com/eb/art-4741/Centipede Date visited- November 20,
2007
6.
Millipede- http://greennature.com/gallery/pictures-of-insects/yellow_spotted_millipede.html
Date visited- November 20, 2007