Phylum Chordata

Phylum Chordata

1. Have a notochord

2. Hollow dorsal nerve tube

3. Tail that extends beyond the anus

4. Muscular tube called pharynx

5. Vertebrata

   • Class Agnatha (Jawless fish)
     • Slimy skin
     • Lack paired fins
     • Notochord and skeleton made of cartilage
     • Ex: lamprey
   • Class Chondrichthyes (Cartilaginous fish)
     • Jaws
     • Paired fins and gills
     • Ex: sharks, rays
   • Class Osteichthyes (Bony fish)
     • Ex: trout, salmon, eel
     • Two chambered heart
     • Swim bladder
     • External fertilization
   • Amphibians
     • External fertilization
     • Herbivore tadpoles
     • Become carnivorous adults with primitive lungs
     • Three chambered heart
   • Reptiles
     • Terrestrial
     • Skin reduces water loss
     • Lungs with internal folds
     • Three chambered heart with septum to partially separate blood
     • Amniotic egg
     • Lightweight skeleton
     • Repositioning of limbs
   • Birds
     • Feathers
     • Air sacs
     • Hollow bones
     • Four chambered heart
     • Lack urinary bladder
   • Mammals
     • Monotremes
       • Ex: platypus
       • Egg layers
     • Marsupials
       • Born immature
       • Confined to Australia
       • Ex: kangaroos, koala bears
     • Placental Mammals
       • Placenta
       • Ex: humans, bears
       • Umbilical cord
     • Mammary glands
     • Warm-blooded
     • Four chambered heart
     • Diaphragm
     • Fleshy lips
     • Usually 4 legs with 5 toes
     • Echolocation

6. Cephalochordata

7. Urochordata