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Chordates -> Vertebrates
From basal Deuterostomes
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Outline • Origins of Deuterostomes & Chordates • Characteristics of Deuterostomes &
Chordates • Themes in Chordate evolution? • Vertebrate adaptations? • How are Vertebrates related? • Who are the contemporary Vertebrates?
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Deuterostome ancestors & characters
What kind of traits are these?
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Synapomorphies of Chordata 1. Pharyngeal gill pouches
• Modified in adults of terrestrial lineages; become gills in aquatic lineages
2. Notochord (gelatinous; cartilaginous) • Organizes body • Forms somites: blocks of tissue that produce
limbs, segmented skeletal muscle, ribs 3. Dorsal, hollow, nerve chord 4. Muscular, post-anal tail
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Chordate precursors
• Echinoderms – Sea stars; brittle
stars • Hemichordates
– Acorn worms
Echino Hemi Uro Verts Cephalo
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Overhead drawing: Generalized chordate features
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Themes in evolution of Chordates
• Increasing cephalization • Gaining teeth, jaws, and diversifying them. • Vertebrate structures from invertebrate
bodies – Skeletons (endo), cephalization of DHNC,
limbs • Morphological innovations that allowed
invasion of land
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Fossils mark major innovations
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Major innovations • From Cartilage
– Scattered, unorganized cells surrounded by proteins & polysaccharides; Avascular
– Stiff, flexible • To Bone (~ 480 Mya) Exoskeleton & teeth
– Organized cells surrounded by proteins & calcium crystals; Vascularized
– Rigid; stiff in compression, relatively flexible under tension
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Major innovations
• From Pharyngeal gill arches (& slits) – For acquiring O2 & some filter feeding – One gill arch becomes modified ->
• To Jaws (~ 430 Mya) – Now we can bite! Goodbye suspension feeding – Eat big stuff
• Not just floating rice grains – Eat attached stuff
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Pharyngeal gill slits -> Jaws • Vertebrates
– Gill arch evolved into jaws – Same shape and movement – Jaws & arches (and not
neighboring structures) derive from neural crest cells
– Attached muscles originate from same population of embryonic cells
– Ray-finned fishes modified arches further
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Major innovations
• From Fins – Great for propulsion or steering in water
• To 4 limbs (~ 375 Mya) – Tetrapods – Allowed access to terrestrial environments
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Locomotion • Evidence for transition from
Fish – Lungfish – Structural evidence
• Many fossil intermediates – Molecular genetic evidence
• In both limbs & fins, the same patterning genes are active at same time.
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Major innovations • From unbound gelatinous egg
– Fine if bathed in water • To Amniotic egg (~ 355 Mya) Amniotes
– Watertight shell (or case) enclosing food supply, water supply & waste repository
– Provides freedom from aquatic environments – Now you can live anywhere, because egg
(membrane or shell) resists desiccation
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Amniotic egg • Early Tetrapods =
Amphibian-like eggs • Contemporary Amniotes
have encased, membrane-bound eggs – Watertight – Albumen layer: water supply – Amnion: cushions embryo – Yolk sac: nutrients – Allantois: waste container – Chorion: SA for gas exchange
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Major innovations • From smooth, moist epithelia
– Good for exchanging H2Oand O2 and waste in water
• To hard, keratinized epithelia – Necessary for preventing desiccation
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Clicker Q • What challenges did Vertebrates face in
moving from an aquatic to a terrestrial environment?
1. Resisting desiccation 2. Exchanging gases in a new media (air vs. water) 3. Moving through an environment dominated by
gravity 4. All of the above
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Vertebrate diversity
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Vertebrate Diversity
• Feeding – Jaws
• Locomotion – Tetrapod limb
• Reproduction – Amniotic egg
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Feeding • Echinoderms
– Suspension feeding – Deposit feeding – Harvesting
• Basal Vertebrates -jawless – Deposit feeding – Ectoparasites
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Locomotion • Aquatic Vertebrates
– Fins & lateral undulation • Lungfish
– Limb-like fins: short distance excursions – Lungs: additional O2 – Burrow in mud: survive droughts
• Tetrapods – Fully functional limbs
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Reproduction
1. Amniotic egg 2. Placenta 3. Parental care
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Placenta • Placenta “replaces” yolk
sac & allantois – Highly vascularized for
nutrient & gas exchange • Probably represents a
trade-off – Invest lots in few offspring – Invest little in many
offspring
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Parental care • Widespread in vertebrates
– Any energy output that increases survival of offspring
• Highly developed & consistent in birds & mammals – Feeding; warming; protecting – Lactation: offspring totally dependent on
mother for nutrition – Placentation & Lactation represent highest
energy provisioning & output of any animal
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“Agnathans”
• 110 species • Hagfish
– Scavengers and predators
– Carcass and buried prey
• Lampreys – Ectoparasites – Attach, rasp, drink
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Cartilagenous Fish • 840 species • Cartilagenous skeletons • Mostly marine • Feeding: Mostly predators • Sharks
– Movement: Lateral undulation – Active predators
• Skates, Rays – Locomotion: pectoral fin flapping – Feeding: Sit & wait.
Electrocute/stun prey
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Ray-finned Fish • Ray-finned fishes • 24,000 species • Huge diversity
– Feeding – Locomotion – Reproduction
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Lobe-finned Fish • 8 species • Coelocanth
– Omnivorous; fish & plant matter
• Lungfish – Limbs made of
distinguishable bones & muscle
– Lungs • Movement: Lateral
undulation • Repro: Oviparous
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Amphibia • 4800 species • Frogs & toads; Salamanders;
Caecilians • Feeding:
– Carnivorous adults – Mostly sit & wait
• Movement: – Lateral undulation; hopping;
burrowing • Repro:
– Oviparous – External fert. (F&T) – Internal fert. (Sallys, Caecilians)
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Mammalia • Monotremes (3)
– Oviparous; nutritious sweat • Marsupials (275)
– Viviparous; prolonged lactation • Placentals (4300)
– Viviparous; prolonged gestation • Movement:
– Swim, walk, glide, fly, brachiate, burrow, hop
• Feeding: – Carnivores, herbivores, omnivores
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Turtles & Tortoises • 271 species • Feeding:
– Herbivores; carnivores • Reproduction:
– Oviparous; Temp-dependent sex determination; no care
• Movement: – Swim; walk; burrow
• Turtles – Marine & freshwater
• Tortoises – Terrestrial
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Archosauria • Repro: Oviparous; extensive
parental care • Crocodilians (crocs, alligators,
caimans) – 21 species – Locomotion: Walk, gallop, lateral
undulation – Feeding: predators
• Birds – 9700 species – Locomotion: Fly, run, swim – Feeding: omnivores, herbivores
(nectar, seeds), predators
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Lepidosauria • Squamata (“lizards” & snakes) • 6800 species • Many limb reductions • Feeding:
– Predators • sit & wait & active • Constriction, venom injection,
twist & shear – Herbivores
• Movement: Lateral undulation • Repro: oviparous, ovoviviparous;
some parthenogenesis in whiptails