Crustaceans (Lobsters,Crabs, and Shrimp) Just the Facts…. • Crustaceans belong to the Phylum Arthropoda (jointed feet). • All Arthropods have jointed appendages. • All Arthropods have an exoskeleton. The Exoskeleton • Is made of a tough fibrous material called chitin. • This gives the skeleton strength and flexibility. • There are several pairs (5 or more) of jointed appendages (movable arms and legs). Molting • Molting is when the exoskeleton is shed as the organism outgrows it. Other Characteristics • Bilateral symmetry • Two main body segments Cephalothorax Abdomen • They filter feed, scavenge, or are predatory • Use appendages for food getting and movement • Found throughout the oceans of the world • Are an important food source for other marine organisms • They reproduce sexually, fertilize externally • Have gills to breathe The Mantis Shrimp QuickTime™ and a decompressor are needed to see this picture. Tough Guy! QuickTime™ and a decompressor are needed to see this picture. The Mantis Shrimp vs. The Blue Ringed Octopus QuickTime™ and a decompressor are needed to see this picture. Crustacean Wars QuickTime™ and a decompressor are needed to see this picture.