chapter 34
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Chapter 34. Vertebrates. The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone Vertebrates are a subphylum of the phylum chordata. 1. What are the four characteristics of chordates?. - PowerPoint PPT PresentationTRANSCRIPT
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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
PowerPoint® Lecture Presentations for
Biology Eighth Edition
Neil Campbell and Jane Reece
Lectures by Chris Romero, updated by Erin Barley with contributions from Joan Sharp
Chapter 34Chapter 34
Vertebrates
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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
• The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone
• Vertebrates are a subphylum of the phylum chordata
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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
• Notochord – flexible rod between digestive tube and nerve cord (skeletal support)
• Dorsal, hollow nerve cord – develops into CNS
• Pharyngeal slits/clefts – become feeding structures, gills, or ear/neck parts
• Muscular, post-anal tail – propulsion or balance
1. What are the four characteristics of chordates?
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Fig. 34-3
Dorsal,hollow
nerve cord
AnusMuscular,
post-anal tail
Pharyngealslits or clefts
Notochord
Mouth
Musclesegments
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Fig. 34-4
Dorsal, hollownerve cord
Notochord
Tail
Cirri
Mouth
Pharyngeal slits
Digestive tract
Atrium
Atriopore
Segmentalmuscles
Anus
2 cm
Lancelets
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Fig. 34-5
Tunic
Water flow
Excurrentsiphon
Atrium
An adult tunicate
Pharynxwithslits Anus
Atrium
Excurrentsiphon
Incurrentsiphonto mouth
Dorsal, hollownerve cord
Incurrentsiphon
Excurrentsiphon
Musclesegments
Notochord
Tail
Stomach
Intestine
Intestine
Esophagus
Stomach
Pharynx with slits
A tunicate larva
Tunicates
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Fig. 34-9
Slime glands
• Craniates share some characteristics: a skull, brain, eyes, and other sensory organs
Hagfish
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Lampreys
• Lampreys (Petromyzontida) represent the oldest living lineage of vertebrates
• They are jawless vertebrates inhabiting various marine and freshwater habitats
• They have cartilaginous segments surrounding the notochord and arching partly over the nerve cord
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Fig. 34-14
Gnathostomes – jawed vertebrates
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Fig. 34-15
Pelvic finsPectoral fins
(c) Spotted ratfish (Hydrolagus colliei)
(a) Blacktip reef shark (Carcharhinus melanopterus)
(b) Southern stingray (Dasyatis americana)
• Chondrichthyans have a skeleton composed primarily of cartilage
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Fig. 34-17
(a) Yellowfin tuna (Thunnus albacares)
(b) Clownfish (Amphiprion ocellaris)
(c) Sea horse (Hippocampus ramulosus)
(d) Fine-spotted moray eel (Gymnothorax dovii)
• osteichthyans have a bony endoskeleton
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2. In the evolution of vertebrates, identify the significance of being a tetrapod.
• Tetrapods have some specific adaptations:
– Four limbs, and feet with digits
• Support out of water
– Ears for detecting airborne sounds
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Fig. 34-21
(a) Order Urodela
(b) Order Anura
(c) Order Apoda
Amphibians
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Fig. 34-22
(c) Mating adults
(a) Tadpole
(b) During metamorphosis
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3. What is the significance of the amniotic egg and amniotes?
• Amniotes are a group of tetrapods whose living members are the reptiles, including birds, and mammals
• named for the major derived character of the clade, the amniotic egg, which contains membranes that protect the embryo
• The extraembryonic membranes are the amnion, chorion, yolk sac, and allantois
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Fig. 34-25
Yolk sac
Amnioticcavitywithamnioticfluid
Chorion
Amnion
Albumen
Yolk(nutrients)
Allantois
Embryo
Shell
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• Keeps embryo from drying out
• Exchanges gases and wastes
• Absorbs shock
• Amniotes have other terrestrial adaptations, such as relatively impermeable skin and the ability to use the rib cage to ventilate the lungs
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Fig. 34-27
(a) Tuatara (Sphenodon punctatus)
(c) Wagler’s pit viper (Tropidolaemus wagleri)
(b) Australian thorny devil lizard (Moloch horridus)
(e) American alligator (Alligator mississippiensis)
(d) Eastern box turtle (Terrapene carolina carolina)
Reptiles
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Fig. 34-30
(a) Emu
(b) Mallards
(c) Laysan albatrosses
(d) Barn swallows
• Birds – wings, no teeth or bladder
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Derived Characters of Mammals
• Mammals have
– Mammary glands, which produce milk
– Hair
– A larger brain than other vertebrates of equivalent size
– Differentiated teeth
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• By the early Cretaceous, the three living lineages of mammals emerged: monotremes, marsupials, and eutherians
• Mammals did not undergo a significant adaptive radiation until after the Cretaceous
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Fig. 34-32
• Monotremes - egg-laying mammals consisting of echidnas and the platypus
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Fig. 34-33
(a) A young brushtail possum
(b) Long-nosed bandicoot
• Marsupials (opossums, kangaroos, koalas)
• embryo develops within a placenta in the mother’s uterus, completes its development while nursing in a maternal pouch
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Eutherians (Placental Mammals)
• eutherians complete their embryonic development within a uterus, joined to the mother by the placenta
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Primates
• The mammalian order Primates includes lemurs, tarsiers, monkeys, and apes
• Humans are members of the ape group
• Most primates have hands and feet adapted for grasping
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• Other derived characters of primates:
– A large brain and short jaws
– Forward-looking eyes close together on the face, providing depth perception
– Complex social behavior and parental care
– A fully opposable thumb (in monkeys and apes)
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Derived Characters of Humans
• A number of characters distinguish humans from other apes:
– Upright posture and bipedal locomotion
– Larger brains
– Language capabilities and symbolic thought
– The manufacture and use of complex tools
– Shortened jaw
– Shorter digestive tract
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The Earliest Hominins
• The study of human origins is known as paleoanthropology
• Hominins (formerly called hominids) are more closely related to humans than to chimpanzees
• Paleoanthropologists have discovered fossils of about 20 species of extinct hominins
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• Hominins originated in Africa about 6–7 million years ago
• Early hominins had a small brain but probably walked upright
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• Two common misconceptions about early hominins:
– Thinking of them as chimpanzees
– Imagining human evolution as a ladder leading directly to Homo sapiens
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Australopiths
• Some species walked fully erect
• “Robust” australopiths had sturdy skulls and powerful jaws
• “Gracile” australopiths were more slender and had lighter jaws
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Early Homo
• The earliest fossils placed in our genus Homo are those of Homo habilis, ranging in age from about 2.4 to 1.6 million years
• Stone tools have been found with H. habilis, giving this species its name, which means “handy man”
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• Homo ergaster was the first fully bipedal, large-brained hominid
• The species existed between 1.9 and 1.5 million years ago
• Homo ergaster shows a significant decrease in sexual dimorphism (a size difference between sexes) compared with its ancestors
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• Homo erectus originated in Africa by 1.8 million years ago
• It was the first hominin to leave Africa
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Neanderthals
• Neanderthals, Homo neanderthalensis, lived in Europe and the Near East from 200,000 to 28,000 years ago
• They were thick-boned with a larger brain, they buried their dead, and they made hunting tools
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Homo Sapiens
• Homo sapiens appeared in Africa by 195,000 years ago
• All living humans are descended from these African ancestors
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• The oldest fossils of Homo sapiens outside Africa date back about 115,000 years and are from the Middle East
• Humans first arrived in the New World sometime before 15,000 years ago
• In 2004, 18,000 year old fossils were found in Indonesia, and a new small hominin was named: Homo floresiensis