Lecture 16 Outline Chapter 34 - Crampton Bio II Lecture...

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Crampton Bio II Lecture Handouts Lecture 16 Lecture 16 : Chordates I Slide 1: The story so far: Slide 2: What are Chordates? 1. TRIBLOBASTIC BILATERIA 2. COELOMATES 3. DEUTEROSTOMES Four characters common to all chordates: (Fig. 34.3) 1. Notochord 2. Dorsal, hollow nerve chord 3. Pharyngeal slits 4. Muscular post-anal tail Slide 3: Notochord: Skeletal support & anchor for swimming muscle Flexible rod made of fluid-filled cells Fig. 34.3 1
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Crampton Bio II Lecture Handouts Lecture 16 Slide 4: Dorsal, hollow nerve cord Fig. 34.3 Develops into CNS Non-chordate nerve cords are solid e.g. in this annelid Slide 5: Pharyngeal slits (Pharynx is portion of digestive tract near mouth) Filter-feeding devices Respiration (gills) Fig. 34.3 Slide 6: Pharyngeal slits found in embryos of all chordates – even if absent in the adults Slide 7: Muscular, post-anal tail. for propulsion Fig. 34.3 Slide 8: Phylum Chordata: Subphylum: Cephalochordata Urochordata 2
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Crampton Bio II Lecture Handouts Lecture 16 Craniata Fig. 34.2.
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