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Chordata Group A: Agnatha , Chondrichthyes , Osteichthyes. Grace Allen Gunner Drossel Lauren Reuland. Complexity. Antropoda Segmented Bodies, Jointed limbs Exoskeleton Ventral Nerve Chords Have Brain Compound Eyes. Chordata – Fish Notochord Endoskeleton (bones) Gills

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Chordata Group A: Agnatha , Chondrichthyes , Osteichthyes


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  1. Chordata Group A:Agnatha, Chondrichthyes, Osteichthyes Grace Allen Gunner Drossel Lauren Reuland

  2. Complexity Antropoda • Segmented Bodies, Jointed limbs • Exoskeleton • Ventral Nerve Chords • Have Brain • Compound Eyes Chordata – Fish • Notochord • Endoskeleton (bones) • Gills • Internal Fertilization

  3. Common Characteristics • Agnatha: Jawless • Chondrichthyes: Jawed - cartilage • Osteichthyes: Jawed – bone • All: 5 senses, fins, muscles, swim bladders (sac),

  4. Agnatha Life Cycle

  5. Osteichthyes Life Cycle

  6. Chondrichthyes Life Cycle

  7. Body Plan of Agnatha

  8. Body Plan of Chondrichthyes

  9. Body Plan of Osteichthyes

  10. Fish Tissue • Chordata are triploblastic: • Ectoderm- epidermis/skin , pituitary gland, nasal placode, and anterior forebrain • Mesoderm- ventral (blood/connective tissues) and mesoderm (notochord and somites) • Endoderm- gives rise to digestive and resp. systems

  11. Agnatha Reproduction • External fertilization • External development • Most species are hermaphrodites • Reproduce in freshwater riverbeds • Larvae: 4 years of development

  12. Chondrichtyes Reproduction • Courtship and copulation • Seminal fluid injected into female • Internal fertilization • Low rate • 43% lay eggs • 1 month to 2 years gestation period

  13. Osteichthyes Reproduction • Some are hermaphrodites • Sex reversal- males to females, vice versa • Courtship- attracting males • Spawning- gametes release in water • Copulation- direct transfer of sperm

  14. Evolutionary Development • Cambrian Explosion- 530 mil years ago • Fossil record – jawless lineages almost extinct • Lampreys approximate ancient pre-jawed fish • First jaws found in Placodermi fossils • Advantage of hinged jaw is unclear (biting force? Improved respiration?)

  15. Ecological Niche(s) • Chondrichthyes- oceans top predators, population control (1,000+ species total) • Agnatha – marine and freshwater environments (120 species total) • Osteichthyes- consumers, predators, scavengers in marine waters (24500+ species total)

  16. Example 1 • LAMPREY • Petromyzontidae • Freshwater and coastal habitats • Resemble eels • Cartilaginous skeleton • Most basal group • Parasitic as adults

  17. Example 2 • Great Hammerhead shark • Sphyrna • 9 species total • Tropical waters • Lagoons, coral reefs, continental shelves, island terraces • Endangered due to demand for meat

  18. Example 3 • Devil Anglers • LophiusPiscatorius • Carnivorous species • Live 3000 meters below the surface • Worldwide habitats • Known as “Common Black Devil” • http://www.youtube.com/watch?v=Z-BbpaNXbxg

  19. VIDEOS • http://www.youtube.com/watch?v=3-Zk1nd_dY8 • http://www.youtube.com/watch?v=fMTHrvskSW8 • http://www.youtube.com/watch?v=hgCKBTv03vc