05-earlyverts - to support jaws; muscles, teeth refined...

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Evolution of the earliest vertebrates 460:206 DINOSAURS
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The Cambrian Explosion (~544-500 Ma) 1 st “conspicuous” fossil record
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The Cambrian Explosion (~544-500 Ma) Trilobites exoskeletons
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PHASE I: The Cambrian Marine Ecosystem Cambrian – Mid Ordovician 150 families of marine animals
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Evolution of Reef Environments Ecological tiering or stratification
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Vertebrata Spine of segmented vertebrae
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Vertebrate Origins INVERTEBRATES WITH NOTOCHORDS
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Chordata Urochordates (sea squirts) Cephalochordates (ocean filter feeders)
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Notochord : nerve chord running along the back of the body Sensation for movement: swimming, feeding
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Vertebral column: spine of segmented spine Hardening of tissues surrounding notochord with phosphate
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What came before Pisces? What was the first group to have vertebrae?
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The Gill Arch System Filter-feeders: cilia around mouth Gills: 1 st gill arch became jaws; scales transformed into teeth 2 nd gill arch moved forward
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Unformatted text preview: to support jaws; muscles, teeth refined Evolution of the Jaws AGNATHANS No jaw Bony gill arches Evolution of the Jaws OSTEICHTHYES 4 th gill arch modified to hyoid arch Teeth present Todays Cladogram Evolution of the Jaws PLACODERMS CLASSIFICATION OF THE VERTEBRATES Class Chondrichthyes Chondrichthyes Acanthodii CLASSIFICATION OF THE VERTEBRATES Grade Pisces?? Class Osteichthyes Actinopterygii What do we need to transition onto Land? Evolution of the Limbs AXIAL SKELETON APPENDICULAR SKELETON appendages along the central axis (head, vertebrae) Evolution of the Limbs Ray fin fish Actinopterygians Undifferentiated arm bones (several bony rays) Evolution of the Limbs Dipnoi Evolution of the Limbs Crossopterygians Evolution of the Limbs Amphibian Differentiated arm bones (humerus, ulna) Labyrinthodont: teeth characterized by folded sheets of dentine...
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05-earlyverts - to support jaws; muscles, teeth refined...

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