Chordates -> Vertebrates. From basal Deuterostomes
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1 Chordates -> Vertebrates From basal Deuterostomes
2 Outline Origins of Deuterostomes & Chordates Characteristics of Deuterostomes & Chordates Themes in Chordate evolution? Vertebrate adaptations? How are Vertebrates related? Who are the contemporary Vertebrates?
3 Deuterostome ancestors & characters What kind of traits are these?
4
5 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
6 Chordate precursors Echinoderms Sea stars; brittle stars Hemichordates Acorn worms Echino Hemi Uro Cephalo Verts
7 Overhead drawing: Generalized chordate features
8 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
9 Fossils mark major innovations
10 From Cartilage Major innovations 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
11 Major innovations From Pharyngeal gill arches (& slits) For acquiring O 2 & 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
12 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
13 Major innovations From Fins Great for propulsion or steering in water To 4 limbs (~ 375 Mya) Tetrapods Allowed access to terrestrial environments
14 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.
15 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
16 Amniotic egg Early Tetrapods = Amphibian-like eggs Contemporary Amniotes have encased, membranebound eggs Watertight Albumen layer: water supply Amnion: cushions embryo Yolk sac: nutrients Allantois: waste container Chorion: SA for gas exchange
17 Major innovations From smooth, moist epithelia Good for exchanging H 2 Oand O 2 and waste in water To hard, keratinized epithelia Necessary for preventing desiccation
18
19 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
20 Vertebrate diversity
21 Vertebrate Diversity Feeding Jaws Locomotion Tetrapod limb Reproduction Amniotic egg
22 Echinoderms Suspension feeding Deposit feeding Harvesting Feeding Basal Vertebrates -jawless Deposit feeding Ectoparasites
23 Locomotion Aquatic Vertebrates Fins & lateral undulation Lungfish Limb-like fins: short distance excursions Lungs: additional O 2 Burrow in mud: survive droughts Tetrapods Fully functional limbs
24 Reproduction 1. Amniotic egg 2. Placenta 3. Parental care
25 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
26 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
27 Agnathans 110 species Hagfish Scavengers and predators Carcass and buried prey Lampreys Ectoparasites Attach, rasp, drink
28 840 species Cartilagenous skeletons Mostly marine Cartilagenous Fish Feeding: Mostly predators Sharks Movement: Lateral undulation Active predators Skates, Rays Locomotion: pectoral fin flapping Feeding: Sit & wait. Electrocute/stun prey
29 Ray-finned fishes 24,000 species Huge diversity Feeding Locomotion Reproduction Ray-finned Fish
30 8 species Coelocanth Omnivorous; fish & plant matter Lungfish Limbs made of distinguishable bones & muscle Lungs Movement: Lateral undulation Repro: Oviparous Lobe-finned Fish
31 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)
32 Monotremes (3) Mammalia 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
33 Turtles & Tortoises 271 species Feeding: Herbivores; carnivores Reproduction: Oviparous; Temp-dependent sex determination; no care Movement: Swim; walk; burrow Turtles Marine & freshwater Tortoises Terrestrial
34 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
35 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
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