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Crustaceans

Dive into the world of Crustaceans, aquatic organisms with segmented bodies, jointed legs, and exoskeletons. Learn about their anatomy, feeding practices, cute responses to stimuli, and unique reproduction methods.

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Crustaceans

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  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 •  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 • Some are sessile such as barnacles • 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. • molting - shed previous exoskeleton, new and larger exoskeleton is formed

  7. 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

  8. 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

  9. Gas Exchanges/ Secretions • Gills for taking oxygen out of water and air • Chitin secreted through epidermis for exoskeleton molting •  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 

  10. Feeding Practices • many appendages for feeding •  mandible, maxilla, chelipeds, antenna •  vary widely •  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

  11. Super cute!

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

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

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