chordates260 - Urochordates show chordate characters in the...

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Urochordates show chordate characters in the larva 1. Notochord 2. Dorsal hollow nerve 3. Pharyngeal slits Lancelets (cephalochordates) nestle within burrows in the sand filter feed on particles such as phytoplankton 1. Increased cephalization 2. Increased activity levels 3. Increased tendency toward predatory life-style Vertebrate Body Plan 1. Notochord 2. Dorsal hollow nerve, brain, eyes 3. Paired kidneys 4. Pharyngeal slits 5. Heart, aortic arches, dorsal aorta 6. Segmented body organization Lobe-finned Lungfish Their "lung" is a modified swim bladder, which also absorbs oxygen and removes wastes. Modern lungfish are able to survive when their pools dry up by burrowing into the mud and sealing themselves within a mucous-lined burrow. During this time, they breathe air through their swim bladder instead of through their gills, and reduce their metabolic rate dramatically. These fish will even drown if they are kept underwater and not allowed to
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This note was uploaded on 04/20/2008 for the course ANTHROPOLO 360 taught by Professor ? during the Spring '08 term at Washington State University .

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chordates260 - Urochordates show chordate characters in the...

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