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Chapter 34 notes

Chapter 34 notes - Vertebrates Click to edit Master...

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Click to edit Master subtitle style 6/13/11 Chapter 34 Vertebrates
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6/13/11 Chordate phylogeny
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6/13/11 Clicker question Which of the following statements is not true? All chordates have notochords All chordates have pharyngeal pouches All chordates have a post-anal tail All chordates have vertebrae *
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6/13/11 Concept 34.1: chordates have a Chordates are deuterostome bilaterian animals 2 chordate subphyla are invertebrates Urochordata Cephalochordata 3rd subphylum Craniata includes the vertebrates
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6/13/11 dervied characters of chordates All chordates share 4 derived characters Although some species possess some of Figure 34.3
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6/13/11 Tunicates Subphylum Urochodata Sessile marine suspension feeders Draws water in through incurrent siphon, filtering Figure
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6/13/11 Tunicates Tunicates possess the chordate characteristics during their larval stage Figure 34.5c
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6/13/11 Lancelets Subphylum Cephalochordata Marine suspension feeders Retain chordate features throughout lifespan Figure 34.4
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6/13/11 Clicker Question Which of the following is a diagnostic feature of tunicates that forms the basis for its classification as a chordate? Metamorphosis from a motile larva to a sessile adult A heart that allows circulation of blood A notochord located along the dorsal part of
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6/13/11 Concept 34.2: craniates are chordates Subphylum Craniata The origin of the head in chordates allowed some to become active predators Shared characters in craniates Cranium Brain
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6/13/11 Hagfishes Class Myxini The least derived extant species of Craniate Jawless, marine craniates Cartilagenous skull & axial rod derived from notochord No vertebrae Figure 34.9
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6/13/11 Lampreys Figure 34.10
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6/13/11 origin of bone & teeth Mineralization appears to have originated with vertebrate mouthparts Conodonts were 1st with mineralized mouth and pharyngeal parts Ostracoderms had mineralized plates on their skin Endoskeleton became mineralized later
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