Animal Diversity II Vertebrates Copyright 2005 Pearson Prentice

• Chordate features in the human embryo (F 23. 1 p. 450) Copyright

eye heart liver Key Features of Chordates tail limb bud (future leg) gill slit limb bud (future arm)

Key Features of Chordates • Invertebrate Chordates Lack a Backbone – Invertebrate chordates Copyright

nerve cord notochord gut muscle segments tail (a) Lancelet mouth anus gill slits (b) Tunicate mouth water enters (mouth) atrial opening tail anus attachment points water exits gill slits nerve gut cord gill notochord slits larva heart gut gonad adult

Key Features of Chordates • Vertebrates Have a Backbone • Major Groups of Vertebrates – Some Vertebrates Lack Jaws • Hagfishes Are Slimy Residents of the Ocean Floor • Jawless fishes (F 23. 3 p. 452) – Some Lampreys Parasitize Fish Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates • Jawed Fishes Rule Earth’s Waters – Cartilaginous Fishes Are

Major Groups of Vertebrates – Bony Fishes Are the Most Diverse Vertebrates • The

Major Groups of Vertebrates • Amphibians Live A Double Life – Amphibian means “double

Major Groups of Vertebrates • Reptiles and Birds Are Adapted for Life on Land

Major Groups of Vertebrates – Have Scales and Shelled Eggs • The amniote egg

Major Groups of Vertebrates – Birds Are Feathered Reptiles • The diversity of birds (F 23. 9 p. 457) • Archaeopteryx, the “missing link” between reptiles and birds (F 23. 10 p. 457) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates • Mammals Provide Milk to Their Offspring – The diversity of mammals – Nonplacental mammals Copyright © 2005 Pearson Prentice Hall, Inc. (F 23. 11 p. 458 ) (F 23. 12 p. 459)