1. Crustaceans

2. Phylum Names Kingdom: Animalia Phylum: Arthropoda organisms with segmented bodies, jointed legs or wings, and an external skeleton Subphylum: Crustacea

3. Common Names Crustaceans include many common seafood such as: Crabs Shrimp Lobster And other common aquatic life such as Barnacles Crayfish

4. Giant Isopod Japanese Spider Crab

5. General Characteristics -Nearly all aquatic o Few can live on land, such as hermit crabs -Ranges in size from microscopic to very large -All are mainly free-living, some can be parasitic -Many move by swimming o Some are sessile such as barnacles o Microscopic ones simply move by current such as krill

6. Anatomy and Body Form 3 Parts: Head, Thorax, Abdomen. Head + Thorax = Cephalothorax Exoskeleton - hard outer covering that protects the organism, molts for growth. o molting - shed previous exoskeleton, new and larger exoskeleton is formed

8. Anatomy and Body Form Mandible - hard, short, hefty projections on each side of the mouth. used for biting and chewing food Maxillae - projections that hold food Gills - gas exchange because aquatic Antenna - 2, project out of head for sense and taste Antenal glands - 2, large, inside head to take out metabolic wastes from bodily fluids, excreted through base of antenna Statocysts- organ that senses gravity

10. Anatomy and Body Form Carapace- shield that covers the entire body, tough chitin Chelipeds - pinchers Swimmerets - small paddles on the underside of the abdomen that are used for movement and holding eggs in females Compound Eyes - adults, little eyes inside a larger cavity, important for detecting movement

12. Gas Exchanges/ Secretions Gills for taking oxygen out of water and air Chitin secreted through epidermis for exoskeleton molting o old exoskeleton isn't removed until the new exoskeleton is fully formed Simple excretory organs for waste such as urea and ammonia Antenal glands for excreting metabolic waste through base of antenna

13. Feeding Practices many appendages for feeding o mandible, maxilla, chelipeds, antenna vary widely o filter feeders, scavengers, or predators Filter feeder - take out organic matter from water Scavenger - scraps of dead organisms Predator - mollusks Parasites - small crustaceans on or inside fish

14. Super cute!

15. Response to Stimuli Possess a brain, ventral nerve cord, and well developed sense organs. o Can sense and react to a variety of stimuli. Capable of feeling pain as well as stress, and will react to negative stimuli.

16. Reproduction Most reproduce sexually through eggs. o Most are separate sexes, few are hermaphrodites o Some reproduce asexually Female eggs are carried on the body. o Eggs will develop and hatch after fertilization Larvae undergoes a series of transformations to become an adult. o They grow by molting. Some can change sex during their life