Vertebrate Classes

• Bony Fish:

  • ectotherm
  • bony scales as skin
  • 7 fins
  • respiration: gills
  • 2 heart chambers
  • external fertilisation and development
  • habitat: water
• Amphibians:

  • ectotherm
  • thin, moist skin
  • 4 legs
  • respiration: gills or skin as larvae, lungs or skin as adults
  • 3 heart chambers
  • external and internal fertilisation and development
  • habitat: water and land
• Reptiles:

  • ectotherm
  • dry, scaly skin
  • 4 legs
  • respiration: lungs
  • 3 heart chambers
  • internal fertilisation and external development (eggs)
  • habitat: land
• Birds:

  • endotherm
  • feathers "instead" of skin
  • 2 wings and 2 legs
  • respiration: lungs
  • 4 heart chambers
  • internal fertilisation and external development (eggs)
  • habitat: air and land
• Mammals:

  • endotherm
  • hairy skin
  • 4 legs
  • respiration: lungs
  • 4 heart chambers
  • internal fertilisation and development
  • habitat: land