AP Bio Chapter 34
Overview: Half a Billion Years of Backbones <ul><li>Early in the Cambrian period, about 530 million years ago, an astonish...
<ul><li>The animals called  vertebrates   get their name from vertebrae, the series of bones that make up the backbone </l...
Vertebrates belong to the phylum CHORDATA <ul><li>Other groups in the chordates: </li></ul><ul><li>Urochordates (tunicates...
<ul><li>They are DEUTEROSTOMES along with the echinoderms </li></ul>
Fig. 34-2 Lobed fins Legs Amniotic egg Milk Jaws, mineralized skeleton Lungs or lung derivatives Vertebral column Head Not...
Derived Characters of Chordates <ul><li>All chordates share a set of derived characters </li></ul><ul><li>Some species hav...
Fig. 34-3 Dorsal, hollow nerve cord Anus Muscular, post-anal tail Pharyngeal slits or clefts Notochord Mouth Muscle segments
What happens to those characteristics in higher chordates such as us? <ul><li>Notochord becomes intervertebral cartilagino...
Lancelets <ul><li>Lancelets  (Cephalochordata) are named for their  bladelike shape </li></ul><ul><li>They are  marine sus...
Fig. 34-4 Dorsal, hollow nerve cord Notochord Tail Cirri Mouth Pharyngeal slits Digestive tract Atrium Atriopore Segmental...
Tunicates <ul><li>Tunicates  (Urochordata) are more closely related to other chordates than are lancelets during their lar...
Fig. 34-5 Tunic Water flow Excurrent siphon Atrium An adult tunicate Pharynx with slits Anus Atrium Excurrent siphon Incur...
Early Chordate Evolution <ul><li>Ancestral chordates  may have resembled lancelets </li></ul><ul><li>Genome sequencing of ...
Fig. 34-6 BF1 Brain of vertebrate embryo (shown straightened) Hindbrain Forebrain Midbrain Nerve cord of lancelet embryo B...
Derived Characters of Craniates <ul><li>Craniates have  two clusters of  Hox   genes ; lancelets and tunicates have only o...
Fig. 34-7 Migrating neural crest cells Notochord Dorsal edges of neural plate Neural crest Neural tube
Hagfishes <ul><li>The least derived surviving craniate  </li></ul><ul><li>Hagfishes have a  cartilaginous skull  derived f...
Fig. 34-9 Slime glands
Vertebrates are craniates that have a backbone <ul><li>During the Cambrian period, a lineage of craniates evolved into ver...
Lampreys <ul><li>Lampreys represent the oldest living lineage of vertebrates </li></ul><ul><li>They are  jawless vertebrat...
Fig. 34-10
Fossils of Early Vertebrates <ul><li>Conodonts   were the first vertebrates with  mineralized skeletal elements in their m...
Fig. 34-11 Dental elements
Other armored, jawless vertebrates had defensive plates of bone on their skin Fig. 34-12 Pteraspis Pharyngolepis
Origins of Bone, Teeth, and Jaws <ul><li>Mineralization appears to have originated with vertebrate mouthparts </li></ul><u...
Derived Characters of Gnathostomes <ul><li>Gnathostomes have jaws that might   have evolved from skeletal supports of the ...
Fig. 34-13-3 Skeletal rods Cranium Gill slits Mouth
Fig. 34-14 0.5 m
Chondrichthyans (Sharks, Rays, and Their Relatives) <ul><li>Chondrichthyans  (Chondrichthyes) have a skeleton composed pri...
Fig. 34-15 Pelvic fins Pectoral fins (c) Spotted ratfish ( Hydrolagus colliei ) (a) Blacktip reef shark ( Carcharhinus    ...
<ul><li>Most sharks   </li></ul><ul><ul><li>Have a streamlined body and are swift swimmers </li></ul></ul><ul><ul><li>Are ...
Spiral valve in sharks
<ul><li>Shark eggs are fertilized internally but embryos can develop in different ways: </li></ul><ul><ul><li>Oviparous: e...
<ul><li>The reproductive tract, excretory system, and digestive tract empty into a common  cloaca </li></ul>
Ray-Finned Fishes and Lobe-Fins <ul><li>The vast majority of vertebrates belong to a clade of gnathostomes called Osteicht...
<ul><li>Nearly all living  osteichthyans  have a bony endoskeleton </li></ul><ul><li>Aquatic osteichthyans are the vertebr...
Fig. 34-16 Intestine Adipose fin (characteristic of trout) Cut edge of operculum Swim bladder Caudal fin Lateral line Urin...
Ray-Finned Fishes <ul><li>The  ray-finned fishes , includes nearly all the familiar aquatic osteichthyans </li></ul><ul><l...
Fig. 34-17 (a) Yellowfin tuna ( Thunnus albacares ) (b) Clownfish ( Amphiprion ocellaris ) (c) Sea horse ( Hippocampus    ...
Lobe-Fins <ul><li>The  lobe-fins  (Sarcopterygii) have muscular pelvic and pectoral fins </li></ul><ul><li>Three lineages ...
Fig. 34-18
Tetrapods are gnathostomes that have limbs <ul><li>One of the most significant events in vertebrate history was when the f...
Fig. 34-19 Tetrapod limb skeleton Bones supporting gills
Amphibians <ul><li>Amphibians  (class Amphibia) are represented by about 6,150 species </li></ul><ul><li>Amphibian  means ...
Amniotes are tetrapods that have a terrestrially adapted egg <ul><li>Amniotes are a group of tetrapods whose living member...
Fig. 34-25 Yolk sac Amniotic cavity with amniotic fluid Chorion Amnion Albumen Yolk (nutrients) Allantois Embryo Shell
Reptiles <ul><li>The reptile clade includes the tuataras, lizards, snakes, turtles, crocodilians, birds, and the extinct d...
Fig. 34-27 (a) Tuatara ( Sphenodon punctatus ) (c) Wagler’s pit viper ( Tropidolaemus wagleri ) (b) Australian thorny devi...
Where are the birds now? <ul><li>Birds are archosaurs, but almost every feature of their reptilian anatomy has  undergone ...
Fig. 34-26
<ul><li>Many characters of birds are adaptations that facilitate flight </li></ul><ul><li>The major adaptation is wings wi...
Fig. 34-28 (a) Wing (b) Bone structure (c) Feather structure Finger 1 Finger 2 Finger 3 Palm Hook Vane Barbule Barb Shaft ...
<ul><li>Birds probably descended from small theropods, a group of carnivorous  dinosaurs </li></ul><ul><li>By 150 million ...
Fig. 34-29 Airfoil wing with contour feathers Toothed beak Wing claw Long tail with many vertebrae
Fig. 34-30 (a) Emu (b) Mallards (c) Laysan albatrosses (d) Barn swallows
Mammals are amniotes that have hair and produce milk <ul><li>Mammals , class Mammalia, are represented by more than 5,300 ...
Derived Characters of Mammals <ul><li>Mammals have </li></ul><ul><ul><li>Mammary glands, which produce milk </li></ul></ul...
Monotremes <ul><li>Monotremes  are a small group of egg-laying mammals consisting of echidnas and the platypus </li></ul>
Fig. 34-32
Marsupials <ul><li>Marsupials  include opossums, kangaroos, and koalas </li></ul><ul><li>The embryo develops  within a  pl...
Fig. 34-33 (a) A young brushtail possum (b) Long-nosed bandicoot
Fig. 34-34 Plantigale Marsupial mammals Eutherian mammals Marsupial mammals Eutherian mammals Marsupial mole Flying squirr...
Eutherians (Placental Mammals) <ul><li>Compared with marsupials,  eutherians  have a longer period of pregnancy </li></ul>...
Fig. 34-35b
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Ap Chap 34 The Vertebrates

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  • Ap Chap 34 The Vertebrates

    1. 1. AP Bio Chapter 34
    2. 2. Overview: Half a Billion Years of Backbones <ul><li>Early in the Cambrian period, about 530 million years ago, an astonishing variety of animals inhabited Earth’s oceans </li></ul><ul><li>One type of animal gave rise to vertebrates, one of the most successful groups of animals </li></ul>
    3. 3. <ul><li>The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone </li></ul><ul><li>There are about 52,000 species of vertebrates, including the largest organisms ever to live on the Earth </li></ul><ul><li>Vertebrates have great disparity , a wide range of differences within the group </li></ul>
    4. 4. Vertebrates belong to the phylum CHORDATA <ul><li>Other groups in the chordates: </li></ul><ul><li>Urochordates (tunicates) </li></ul><ul><li>Cephalochordates (lancelets) </li></ul><ul><li>Hagfishes </li></ul><ul><li>Lampreys </li></ul>
    5. 5. <ul><li>They are DEUTEROSTOMES along with the echinoderms </li></ul>
    6. 6. Fig. 34-2 Lobed fins Legs Amniotic egg Milk Jaws, mineralized skeleton Lungs or lung derivatives Vertebral column Head Notochord Common ancestor of chordates ANCESTRAL DEUTERO- STOME Echinodermata (sister group to chordates) Chondrichthyes (sharks, rays, chimaeras) Cephalochordata (lancelets) Urochordata (tunicates) Myxini (hagfishes) Petromyzontida (lampreys) Mammalia (mammals) Actinopterygii (ray-finned fishes) Actinistia (coelacanths) Amphibia (frogs, salamanders) Dipnoi (lungfishes) Reptilia (turtles, snakes, crocodiles, birds) Chordates Craniates Vertebrates Gnathostomes Lobe-fins Osteichthyans Tetrapods Amniotes
    7. 7. Derived Characters of Chordates <ul><li>All chordates share a set of derived characters </li></ul><ul><li>Some species have some of these traits only during embryonic development </li></ul><ul><li>Four key characters of chordates: </li></ul><ul><ul><li>Notochord </li></ul></ul><ul><ul><li>Dorsal, hollow nerve cord </li></ul></ul><ul><ul><li>Pharyngeal slits or clefts </li></ul></ul><ul><ul><li>Muscular, post-anal tail </li></ul></ul>
    8. 8. Fig. 34-3 Dorsal, hollow nerve cord Anus Muscular, post-anal tail Pharyngeal slits or clefts Notochord Mouth Muscle segments
    9. 9. What happens to those characteristics in higher chordates such as us? <ul><li>Notochord becomes intervertebral cartilaginous disks </li></ul><ul><li>Nerve cord stays the same </li></ul><ul><li>Pharyngeal slits initially used for suspension feeding and respiratory structures become ear, neck, and jaw parts </li></ul><ul><li>Tails - gone </li></ul>
    10. 10. Lancelets <ul><li>Lancelets (Cephalochordata) are named for their bladelike shape </li></ul><ul><li>They are marine suspension feeders that retain characteristics of the chordate body plan as adults </li></ul>
    11. 11. Fig. 34-4 Dorsal, hollow nerve cord Notochord Tail Cirri Mouth Pharyngeal slits Digestive tract Atrium Atriopore Segmental muscles Anus 2 cm
    12. 12. Tunicates <ul><li>Tunicates (Urochordata) are more closely related to other chordates than are lancelets during their larval stage. </li></ul><ul><li>They are marine suspension feeders commonly called sea squirts </li></ul><ul><li>As an adult, a tunicate draws in water through an incurrent siphon , filtering food particles </li></ul>
    13. 13. Fig. 34-5 Tunic Water flow Excurrent siphon Atrium An adult tunicate Pharynx with slits Anus Atrium Excurrent siphon Incurrent siphon to mouth Dorsal, hollow nerve cord Incurrent siphon Excurrent siphon Muscle segments Notochord Tail Stomach Intestine Intestine Esophagus Stomach Pharynx with slits A tunicate larva
    14. 14. Early Chordate Evolution <ul><li>Ancestral chordates may have resembled lancelets </li></ul><ul><li>Genome sequencing of tunicates has identified genes shared by tunicates and vertebrates </li></ul><ul><li>Gene expression in lancelets holds clues to the evolution of the vertebrate form </li></ul>
    15. 15. Fig. 34-6 BF1 Brain of vertebrate embryo (shown straightened) Hindbrain Forebrain Midbrain Nerve cord of lancelet embryo BF1 Hox3 Otx Otx Hox3
    16. 16. Derived Characters of Craniates <ul><li>Craniates have two clusters of Hox genes ; lancelets and tunicates have only one cluster </li></ul><ul><li>Neural crest cells that become teeth and bones of skull </li></ul><ul><li>Paryngeal clefts become gill slits </li></ul><ul><li>High metabolism, 2 or more chambered hearts, rbc’s with hemoglobin, kidneys </li></ul>
    17. 17. Fig. 34-7 Migrating neural crest cells Notochord Dorsal edges of neural plate Neural crest Neural tube
    18. 18. Hagfishes <ul><li>The least derived surviving craniate </li></ul><ul><li>Hagfishes have a cartilaginous skull derived from the notochord, but lack jaws and vertebrae </li></ul><ul><li>They are scavengers and slimy! </li></ul>
    19. 19. Fig. 34-9 Slime glands
    20. 20. Vertebrates are craniates that have a backbone <ul><li>During the Cambrian period, a lineage of craniates evolved into vertebrates </li></ul><ul><li>Vertebrates became more efficient at capturing food and avoiding being eaten </li></ul><ul><li>Vertebrates have the following derived characters: </li></ul><ul><ul><li>Vertebrae enclosing a spinal cord </li></ul></ul><ul><ul><li>An elaborate skull </li></ul></ul><ul><ul><li>Fin rays, in the aquatic forms </li></ul></ul>
    21. 21. Lampreys <ul><li>Lampreys represent the oldest living lineage of vertebrates </li></ul><ul><li>They are jawless vertebrates inhabiting various marine and freshwater habitats </li></ul><ul><li>They have cartilaginous segments surrounding the notochord and arching partly over the nerve cord </li></ul>
    22. 22. Fig. 34-10
    23. 23. Fossils of Early Vertebrates <ul><li>Conodonts were the first vertebrates with mineralized skeletal elements in their mouth and pharynx </li></ul>
    24. 24. Fig. 34-11 Dental elements
    25. 25. Other armored, jawless vertebrates had defensive plates of bone on their skin Fig. 34-12 Pteraspis Pharyngolepis
    26. 26. Origins of Bone, Teeth, and Jaws <ul><li>Mineralization appears to have originated with vertebrate mouthparts </li></ul><ul><li>The vertebrate endoskeleton became fully mineralized much later </li></ul><ul><li>Today, jawed vertebrates, or gnathostomes, outnumber jawless vertebrates </li></ul>
    27. 27. Derived Characters of Gnathostomes <ul><li>Gnathostomes have jaws that might have evolved from skeletal supports of the pharyngeal slits </li></ul><ul><ul><li>An additional duplication of Hox genes </li></ul></ul><ul><ul><li>An enlarged forebrain associated with enhanced smell and vision </li></ul></ul><ul><ul><li>In aquatic gnathostomes, the lateral line system, which is sensitive to vibrations </li></ul></ul>
    28. 28. Fig. 34-13-3 Skeletal rods Cranium Gill slits Mouth
    29. 29. Fig. 34-14 0.5 m
    30. 30. Chondrichthyans (Sharks, Rays, and Their Relatives) <ul><li>Chondrichthyans (Chondrichthyes) have a skeleton composed primarily of cartilage </li></ul><ul><li>The cartilaginous skeleton evolved secondarily from an ancestral mineralized skeleton </li></ul><ul><li>The largest and most diverse group of chondrichthyans includes the sharks, rays, and skates </li></ul>Video: Manta Ray
    31. 31. Fig. 34-15 Pelvic fins Pectoral fins (c) Spotted ratfish ( Hydrolagus colliei ) (a) Blacktip reef shark ( Carcharhinus       melanopterus ) (b) Southern stingray ( Dasyatis americana )
    32. 32. <ul><li>Most sharks </li></ul><ul><ul><li>Have a streamlined body and are swift swimmers </li></ul></ul><ul><ul><li>Are carnivores </li></ul></ul><ul><ul><li>Have a short digestive tract; a ridge called the spiral valve increases the digestive surface area </li></ul></ul><ul><ul><li>Have acute senses </li></ul></ul>
    33. 33. Spiral valve in sharks
    34. 34. <ul><li>Shark eggs are fertilized internally but embryos can develop in different ways: </li></ul><ul><ul><li>Oviparous: eggs hatch outside the mother’s body </li></ul></ul><ul><ul><li>Ovoviviparous: the embryo develops within the uterus and is nourished by the egg yolk </li></ul></ul><ul><ul><li>Viviparous: the embryo develops within the uterus and is nourished through a yolk sac placenta from the mother’s blood </li></ul></ul>
    35. 35. <ul><li>The reproductive tract, excretory system, and digestive tract empty into a common cloaca </li></ul>
    36. 36. Ray-Finned Fishes and Lobe-Fins <ul><li>The vast majority of vertebrates belong to a clade of gnathostomes called Osteichthyes </li></ul><ul><li>Osteichthyes includes the bony fish and tetrapods </li></ul>
    37. 37. <ul><li>Nearly all living osteichthyans have a bony endoskeleton </li></ul><ul><li>Aquatic osteichthyans are the vertebrates we informally call fishes </li></ul><ul><li>Most fishes breathe by drawing water over gills protected by an operculum </li></ul><ul><li>Fishes control their buoyancy with an air sac known as a swim bladder </li></ul>
    38. 38. Fig. 34-16 Intestine Adipose fin (characteristic of trout) Cut edge of operculum Swim bladder Caudal fin Lateral line Urinary bladder Pelvic fin Anus Dorsal fin Spinal cord Brain Nostril Gills Kidney Heart Liver Gonad Anal fin Stomach
    39. 39. Ray-Finned Fishes <ul><li>The ray-finned fishes , includes nearly all the familiar aquatic osteichthyans </li></ul><ul><li>The fins, supported mainly by long, flexible rays, are modified for maneuvering, defense, and other functions </li></ul>Video: Clownfish and Anemone Video: Coral Reef
    40. 40. Fig. 34-17 (a) Yellowfin tuna ( Thunnus albacares ) (b) Clownfish ( Amphiprion ocellaris ) (c) Sea horse ( Hippocampus       ramulosus ) (d) Fine-spotted moray eel ( Gymnothorax dovii )
    41. 41. Lobe-Fins <ul><li>The lobe-fins (Sarcopterygii) have muscular pelvic and pectoral fins </li></ul><ul><li>Three lineages survive and include coelacanths, lungfishes, and tetrapods </li></ul>
    42. 42. Fig. 34-18
    43. 43. Tetrapods are gnathostomes that have limbs <ul><li>One of the most significant events in vertebrate history was when the fins of some lobe-fins evolved into the limbs and feet of tetrapods </li></ul><ul><li>Tetrapods have some specific adaptations: </li></ul><ul><ul><li>Four limbs, and feet with digits </li></ul></ul><ul><ul><li>Ears for detecting airborne sounds </li></ul></ul>
    44. 44. Fig. 34-19 Tetrapod limb skeleton Bones supporting gills
    45. 45. Amphibians <ul><li>Amphibians (class Amphibia) are represented by about 6,150 species </li></ul><ul><li>Amphibian means “both ways of life,” referring to the metamorphosis of an aquatic larva into a terrestrial adult </li></ul><ul><li>Most amphibians have moist skin that complements the lungs in gas exchange </li></ul><ul><li>Fertilization is external in most species, and the eggs require a moist environment </li></ul>
    46. 46. Amniotes are tetrapods that have a terrestrially adapted egg <ul><li>Amniotes are a group of tetrapods whose living members are the reptiles, including birds, and mammals </li></ul><ul><li>The extraembryonic membranes are the </li></ul><ul><li>amnion (provide watery environment), </li></ul><ul><li>chorion (gas exchange), </li></ul><ul><li>yolk sac (nourishment), and </li></ul><ul><li>allantois (waste removal) </li></ul><ul><li>Amniotes have other terrestrial adaptations, such as relatively impermeable skin and the ability to use the rib cage to ventilate the lungs </li></ul>
    47. 47. Fig. 34-25 Yolk sac Amniotic cavity with amniotic fluid Chorion Amnion Albumen Yolk (nutrients) Allantois Embryo Shell
    48. 48. Reptiles <ul><li>The reptile clade includes the tuataras, lizards, snakes, turtles, crocodilians, birds, and the extinct dinosaurs </li></ul><ul><li>Reptiles have scales that create a waterproof barrier </li></ul><ul><li>They lay shelled eggs on land </li></ul><ul><li>Most reptiles are ectothermic, absorbing external heat as the main source of body heat </li></ul><ul><li>Birds are endothermic, capable of keeping the body warm through metabolism </li></ul>
    49. 49. 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 )
    50. 50. Where are the birds now? <ul><li>Birds are archosaurs, but almost every feature of their reptilian anatomy has undergone modification in their adaptation to flight </li></ul>
    51. 51. Fig. 34-26
    52. 52. <ul><li>Many characters of birds are adaptations that facilitate flight </li></ul><ul><li>The major adaptation is wings with keratin feathers </li></ul><ul><li>Other adaptations include lack of a urinary bladder, females with only one ovary, small gonads, hollow bones, and loss of teeth </li></ul>Derived Characters of Birds
    53. 53. Fig. 34-28 (a) Wing (b) Bone structure (c) Feather structure Finger 1 Finger 2 Finger 3 Palm Hook Vane Barbule Barb Shaft Wrist Forearm Shaft
    54. 54. <ul><li>Birds probably descended from small theropods, a group of carnivorous dinosaurs </li></ul><ul><li>By 150 million years ago, feathered theropods had evolved into birds </li></ul><ul><li>Archaeopteryx remains the oldest bird known </li></ul>The Origin of Birds
    55. 55. Fig. 34-29 Airfoil wing with contour feathers Toothed beak Wing claw Long tail with many vertebrae
    56. 56. Fig. 34-30 (a) Emu (b) Mallards (c) Laysan albatrosses (d) Barn swallows
    57. 57. Mammals are amniotes that have hair and produce milk <ul><li>Mammals , class Mammalia, are represented by more than 5,300 species </li></ul>
    58. 58. Derived Characters of Mammals <ul><li>Mammals have </li></ul><ul><ul><li>Mammary glands, which produce milk </li></ul></ul><ul><ul><li>Hair </li></ul></ul><ul><ul><li>A larger brain than other vertebrates of equivalent size </li></ul></ul><ul><ul><li>Differentiated teeth </li></ul></ul>
    59. 59. Monotremes <ul><li>Monotremes are a small group of egg-laying mammals consisting of echidnas and the platypus </li></ul>
    60. 60. Fig. 34-32
    61. 61. Marsupials <ul><li>Marsupials include opossums, kangaroos, and koalas </li></ul><ul><li>The embryo develops within a placenta in the mother’s uterus </li></ul><ul><li>A marsupial is born very early in its development </li></ul><ul><li>It completes its embryonic development while nursing in a maternal pouch called a marsupium </li></ul>
    62. 62. Fig. 34-33 (a) A young brushtail possum (b) Long-nosed bandicoot
    63. 63. Fig. 34-34 Plantigale Marsupial mammals Eutherian mammals Marsupial mammals Eutherian mammals Marsupial mole Flying squirrel Sugar glider Deer mouse Mole Tasmanian devil Wombat Kangaroo Woodchuck Patagonian cavy Wolverine
    64. 64. Eutherians (Placental Mammals) <ul><li>Compared with marsupials, eutherians have a longer period of pregnancy </li></ul><ul><li>Young eutherians complete their embryonic development within a uterus , joined to the mother by the placenta </li></ul><ul><li>Molecular and morphological data give conflicting dates on the diversification of eutherians </li></ul>
    65. 65. Fig. 34-35b
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