The document summarizes the characteristics of the phylum Chordata. There are seven main classes of chordates: 1) Agnatha - Jawless fish with a notochord but no jaws, scales or fins. They have gills and are marine or freshwater ectotherms. 2) Condrichythes - Sharks, rays and skates with cartilage skeletons, paired fins, placoid scales and teeth that point inward. They are marine ectothermic carnivores or filter feeders. 3) Osteichthyes - Bony fish with paired fins, scales, swim bladders, chromatophores and lateral lines. They can be marine or fresh

1. Overview of Phylum Chordata Essential Question: What characteristics to all chordates have in common? Essential Question: What classes of animals make up phylum Chordata?

3. Notochord – becomes the backbone in most chordates

4. Pharyngeal pouches – develop into gills in fish; inner ear in other chordates

6. Class: Condrichythes “Sharks, Rays & Skates” Skeleton of cartilage Paired fins Most are carnivores; some filter feeders Placoid scales Teeth that point inward Gills All marine Ectotherm

7. Class: Osteichthyes “Bony Fish” Paired fins & scales Swim bladder Chromatophores Lateral Line Gills Marine & fresh water Ectotherm

8. Class: Amphibia “Frogs, Toads, Salamanders” Metamorphosis Larva = gills Adults = lungs 3 chambered heart Smooth skin Cutaneous respiration Ectotherm

9. Class: Reptilia “Turtles, Snakes, Lizards” Amniotic egg Lungs only Partially 4 chambered heart Scales Keratin Many have toes, claws Ectotherm

10. Class: Aves “Birds” Amniotic egg Feathers Beak Crop 4 chambered heart Migration Endotherm

11. Class: Mammalia “Horses, Dogs, Tapirs” Hair Placenta Mammary Glands Milk Production 4 chambered heart Endotherm

12. Take a moment – With your partner… Discuss what characteristics would you expect the following animals to have?