chapter31%20-%20deuterostomes%20Spring%202008%20_1_

chapter31%20-%20deuterostomes%20Spring%202008%20_1_ - The...

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The Animal Kingdom: The Deuterostomes Chapter 31
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Deuterostomes Shared Derived Characteristics radial and indeterminate cleavage blastopore becomes anus, mouth develops from another opening basal Deuterostome larva have a loop-shaped ciliated band used for locomotion bilaterally symmetrical (at some point in life cycle e.g. echinoderm larvae) and triploblastic In primitive chordates the pharyngeal slits are used to strain water and filter out food particles; in fishes they are modified for respiration. Most terrestrial vertebrates have pharyngeal slits only in the embryonic stage.
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Phylum Hemichordata Acorn worms: marine three-part body (proboscis, collar, trunk) Bury in mud or sand Ring of cilia surrounding mouth Complete digestive tube (mouth and anus)
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Phylum Echinodermata General Characteristics Endoskeleton covered by a skin with spines of CaCO 3 Water vascular system Larvae exhibit bilateral symmetry Adult penta-radial symmetry (except sea cucumber) In each arm: complete simple digestive system, simple NS, well developed coelom No: cephalization, circulatory system, or excretory systems Carnivorous predators Ejects digestive system, respiratory and gonads when environmental conditions deteriorate
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The Chordates (Fig 31-7) Urochordata Tunicates Cephalochordata lancelets
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chapter31%20-%20deuterostomes%20Spring%202008%20_1_ - The...

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