The Vertebrates I. Characteristics of Vertebrates A. Ten Organ Systems 1. Respiratory System 2. Circulatory System 3. Digestive System 4. Integumentary System 5. Reproductive System 6. Excretory System 7. Endocrine System 8. Skeletal System 9. Muscular System 10. Nervous System
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The Vertebrates
I. Characteristics of Vertebrates A. Ten Organ Systems 1. Respiratory System 2. Circulatory System 3. Digestive System 4. Integumentary System 5. Reproductive System 6. Excretory System 7. Endocrine System 8. Skeletal System 9. Muscular System 10. Nervous System
II. Vertebrate Classes A. Agnatha (Jawless Fish) 1. Most primitive fish 2. Paired appendages absent 3. Seven spiracles on the ventral sides of the head 4. Endoskeleton composed of cartilage
Lamprey Hagfish
Lamprey cirri, teeth arranged in rows and dental plates on its tongue
Two lampreys parasitizing a fresh-water fish
B. Chondrichthyes (Cartiliginous fish) 1. jaw present 2. paired appendages a. pectoral fins b. Pelvic fins 3. 5 to 7 gill slits 4. cartiliginous endoskeleton 5. dentacle scales 6. examples: shark, ray, skate