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Subphylum Vertebrata

Subphylum Vertebrata. 7 Classes. A. Cold Blooded (ectotherms). Agnatha: (Jawless Fish) – lampreys, hagfishes Sucker mouth with sharp teeth. A. Cold Blooded (ectotherms). Chondrichthyes: (Hinged Jaw) – sharks, skates, rays Paired fins Detect vibrations in water.

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Subphylum Vertebrata

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  1. Subphylum Vertebrata 7 Classes

  2. A. Cold Blooded (ectotherms) • Agnatha: (Jawless Fish) – lampreys, hagfishes • Sucker mouth with sharp teeth

  3. A. Cold Blooded (ectotherms) • Chondrichthyes: (Hinged Jaw) – sharks, skates, rays • Paired fins • Detect vibrations in water

  4. A. Cold Blooded (ectotherms) • Osteichthyes: (Bony Fish) • Skeleton of bones • Hard plate protects gills

  5. A. Cold Blooded (ectotherms) • Amphibia: (newts, frogs, toads) • 3 chambered heart; lungs • Live on land; return to water to reproduce • Metamorphosis – tadpoles to adults • 3 orders: Anura – frogs (smooth skin) and toads (bumpy skin) Caudata – salamanders and newts; neck, tail, long slender body Apoda – legless caecilians (wormlike bodies)

  6. A. Cold Blooded (ectotherms) • Reptilia: (turtles, snakes, lizards, crocodiles, and alligators) • Dry, scaly skin which prevents drying out • Clawed toes; four legs (except snakes) • Internal fertilization; lays amniotic eggs with leathery shell (prevents dehydration)

  7. B. Warm Blooded (endoderms) • Aves: (birds) • Feathers for flying and insulation • Strong, lightweight, hollow bones • Internal, sexual reproduction • Four chambered heart • High metabolic rate; need energy for flight and heat • Eat constantly to keep up metabolism

  8. B. Warm Blooded (endoderms) • Mammalia: • Feed young from mammary glands; hair to maintain body temperature • 4 chambered heart • Diaphragm for breathing • 3 groups by method of reproduction Monotremes – lay eggs Marsupials (kangaroos and opossum) – second developmental stage outside in pouch Placental – develop inside uterus

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