1. Intro to Chordates p. 270-274

2. Superclass Agnatha Integument: slimy skin Temperature control: ectotherm Limb Structure: no paired limbs Gas Exchange: gills Fertilization: external

3. Class Chondrichthyes Integument: scales Temperature control: ectotherm Limb Structure: 2 pairs of fins Gas Exchange: gills Fertilization: internal

4. Class Osteichthyes Integument: slimy skin and scales Temperature control: ectotherm Limb Structure: 2 pairs of fins Gas Exchange: gills Fertilization: external

5. Class Amphibia Integument: thin, moist skin Temperature control: ectotherm Limb Structure: 2 pairs of legs Gas Exchange: gills, lungs, skin Fertilization: external

6. Class Reptilia Integument: dry, scaly Temperature control: ectotherm Limb Structure: 2 pairs of legs Gas Exchange: lungs Fertilization: internal

7. Class Aves Integument: feathers Temperature control: endotherm Limb Structure: wings, one pair legs Gas Exchange: lungs Fertilization: internal

8. Class Mammalia Integument: hair Temperature control: endotherm Limb Structure: 2 pairs of legs Gas Exchange: lungs Fertilization: internal

9. Hallmarks of Phylum Chordata Notochord Single, tubular, dorsal nerve cord Pharyngeal slits Postanal tail Endostyle * Characteristic present at some point during development!!!

10. Superclass Agnatha p. 287-291 “circular mouths” In place of jaws is an oral sucker Most primitive of all fish External fertilization No stomach Heart: 2 chambers (1 ventricle; 1 artia) No fins Eel body form Poor eye development (hagfish only) Pore-like gill openings

11. Class Myxini Includes hagfish Feed on dead or dying fish Scavengers Completely blind, well developed sense of smell and touch Generate large amounts of slime for defense

12. Class Petromyzones Includes lampreys Most are parasitic, feed on blood and fluids of fish Destructive to fisheries (ex. Great Lakes) Millions of dollars lost each year