• Animal Diversity II: Vertebrates Copyright © 2005 Pearson Prentice Hall, Inc.

• Chordate features in the human embryo (F23.1 p. 450) Copyright © 2005 Pearson Prentice Hall, Inc.

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 (F23.2 p. 451) Copyright © 2005 Pearson Prentice Hall, Inc.

nerve cord notochord gut muscle segments tail

(a) Lancelet

mouth gill slits

(b) Tunicate

mouth atrial opening anus tail

water enters

(mouth) gill slits

water exits

anus attachment points gill slits gut nerve cord notochord

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 (F23.3 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 Marine Predators • Cartilaginous fishes (F23.4 p. 453) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates – Bony Fishes Are the Most Diverse Vertebrates • The diversity of the bony fishes (F23.5 p. 453) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates • Amphibians Live A Double Life – Amphibian means “double life” (F 23.6 p. 455) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates • Reptiles and Birds Are Adapted for Life on Land – The diversity of reptiles (F23.7 p. 456) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates – Have Scales and Shelled Eggs • The amniote egg (F23.8 p. 456) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates – Birds Are Feathered Reptiles • The diversity of birds • (F23.9 p. 457)

Archaeopteryx

, the “missing link” between reptiles and birds (F23.10 p. 457) Copyright © 2005 Pearson Prentice Hall, Inc.

Major Groups of Vertebrates • Mammals Provide Milk to Their Offspring – The diversity of mammals – Nonplacental mammals (F23.11 p. 458 ) (F 23.12 p. 459) Copyright © 2005 Pearson Prentice Hall, Inc.