Crustaceans Phylum Names Kingdom Animalia Phylum Arthropoda organisms

Crustaceans

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

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

Giant Isopod Japanese Spider Crab

General Characteristics -Nearly all aquatic a. 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 a. Some are sessile such as barnacles o Microscopic ones simply move by current such as krill

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

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

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

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

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

Super cute!

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

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