Animalia: Animal Diversity II Key

Summary Table of Animal Characteristics
  1. Roundworm:
    • Symmetry: bilateral
    • Tissue Organization: triploblastic
    • Type of Body Cavity: pseudocoelom
    • Digestive Openings: mouth, anus
    • Circulatory System: none
    • Habitat: various; Ascaris is parasitic
    • Respiratory Organs: none (anaerobic)
    • Excretory System: lateral lines
    • Locomotion: crawl with muscle fibers
    • Support System: hydrostatic skeleton
    • Segmentation: no
    • Appendages: none
    • Nervous System Organization: dorsal and ventral nerve cords

  2. Crayfish:
    • Symmetry: bilateral
    • Tissue Organization: triploblastic
    • Type of Body Cavity: coelom (pericardium)
    • Digestive Openings: mouth, anus
    • Circulatory System: open: heart + arteries, no veins
    • Habitat: aquatic
    • Respiratory Organs: gills
    • Excretory System: green glands
    • Locomotion: 10 walking legs; swimmerets
    • Support System: exoskeleton
    • Segmentation: head, thorax, abdomen
    • Appendages: 10 walking legs; swimmerets, 2 pairs antennae, telson, uropods
    • Nervous System Organization: simple brain, ventral nerve cords

  3. Grasshopper:
    • Symmetry: bilateral
    • Tissue Organization: triploblastic
    • Type of Body Cavity: coelom (hemocoel)
    • Digestive Openings: mouth, anus
    • Circulatory System: open: heart + arteries
    • Habitat: terrestrial
    • Respiratory Organs: spiracles, tracheae
    • Excretory System: Malpighian tubules
    • Locomotion: 6 legs; 4 wings
    • Support System: exoskeleton
    • Segmentation: head, thorax, abdomen
    • Appendages: 6 legs; 4 wings, antennae
    • Nervous System Organization: simple brain, ventral nerve cord, segmental ganglia

  4. Sea Star:
    • Symmetry: bilateral larvae (radial adult)
    • Tissue Organization: triploblastic
    • Type of Body Cavity: coelom
    • Digestive Openings: mouth, anus
    • Circulatory System: water-vascular system operates hemal system
    • Habitat: marine
    • Respiratory Organs: skin gills (dermal branchiae)
    • Excretory System: skin gills
    • Locomotion: tube feet
    • Support System: endoskeleton
    • Segmentation: none
    • Appendages: 5 arms
    • Nervous System Organization: radial nerves, nerve ring

  5. Lancelet (Amphioxus):
    • Symmetry: bilateral
    • Tissue Organization: triploblastic
    • Type of Body Cavity: coelom
    • Digestive Openings: mouth, anus
    • Circulatory System: closed: arteries, capillaries, veins
    • Habitat: marine
    • Respiratory Organs: skin gills
    • Excretory System: skin; gill slits mostly for feeding
    • Locomotion: segmental muscles
    • Support System: notochord
    • Segmentation: muscles
    • Appendages: tentacles, tail
    • Nervous System Organization: dorsal nerve cord

  6. Pig:
    • Symmetry: bilateral
    • Tissue Organization: triploblastic
    • Type of Body Cavity: coelom
    • Digestive Openings: mouth, anus
    • Circulatory System: closed: cardiovascular: heart, arteries, veins
    • Habitat: terrestrial
    • Respiratory Organs: lungs, diaphragm
    • Excretory System: kidney
    • Locomotion: legs
    • Support System: endoskeleton
    • Segmentation: none (vertebrae are segments)
    • Appendages: limbs, tail
    • Nervous System Organization: brain, spinal cord - CNS; PNS

Lab notes made Jul 13, 2009 by Peter Chen