Diversity of Chordates

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Diversity of Chordates

Fish 3 classes Breathing: gills or gill slits 2 chambered heart Agnatha: jawless fishes Lamprey, Hagfish Chondricthyes: Cartilaginous fishes Sharks, skates, rays Ostichthyes: Bony fishes All other fishes Breathing: gills or gill slits 2 chambered heart Sexual Reproduction Most external fertilization Scales

Amphibians Smooth moist skin Mucous glands Metamorphosis Ectothermic sometimes associated with poison glands Metamorphosis Ectothermic Sexual reproduction Variety of respiratory modes Lungs, gills, skin

Reptiles Adaptations for life on dry land Scales Legs positioned right underneath body Can support body weight better 3 chambered heart Crocs have 4 chambers Ectotherms Sexual reproduction Internal fertilization Amniotic egg

Birds Adaptations for flight: Endothermic 4 chambered heart Feathers Wings Hollow bones Endothermic 4 chambered heart Sexual reproduction internal fertilization Amniotic egg with hard shell

Mammals Hair Endothermic Provide milk for their young 4 chambered heart Different types of teeth Modified limbs

Mammals Placental Mammals Offspring are carried inside the mother until development is almost complete Nourishment and oxygen provided via placenta

Mammals Marsupials Short period of development inside mom Second period of development in a pouch made of hair and skin

Mammals Montremes Egg laying mammals Have hair and mammary glands Only found in Austrailia, New Guinea, and Tazmania Echidnas and Platypuses