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Copyright © 2005 Pearson Prentice Hall, Inc.
Chapter 23
• Animal Diversity II: Vertebrates
Copyright © 2005 Pearson Prentice Hall, Inc.
• Chordate features in the human embryo (F23.1 p. 450)
eye heart liver
tail
limb bud(future leg)
limb bud (future arm)gill slit
Key Features of Chordates
Copyright © 2005 Pearson Prentice Hall, Inc.
Key Features of Chordates
• Invertebrate Chordates Lack a Backbone– Invertebrate chordates (F23.2 p. 451)
(b) Tunicate
mouth
attachmentpoints gill
slits
gut
larva
anus
atrialopening
notochord
nervecord
tail
water enters(mouth) water exits
gill slits
heart
gutgonad
adult
(a) Lancelet
nerve cord
mouth
gill slits
notochord gut muscle segments
tail
anus
Copyright © 2005 Pearson Prentice Hall, Inc.
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
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Major Groups of Vertebrates
• Jawed Fishes Rule Earth’s Waters– Cartilaginous Fishes Are Marine Predators
• Cartilaginous fishes (F23.4 p. 453)
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Major Groups of Vertebrates
– Bony Fishes Are the Most Diverse Vertebrates
• The diversity of the bony fishes (F23.5 p. 453)
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Major Groups of Vertebrates
• Amphibians Live A Double Life– Amphibian means “double life” (F 23.6 p. 455)
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Major Groups of Vertebrates
• Reptiles and Birds Are Adapted for Life on Land– The diversity of reptiles (F23.7 p. 456)
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Major Groups of Vertebrates
– Have Scales and Shelled Eggs• The amniote egg (F23.8 p. 456)
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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)
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Major Groups of Vertebrates
• Mammals Provide Milk to Their Offspring– The diversity of mammals (F23.11 p. 458) – Nonplacental mammals (F 23.12 p. 459)
