Ch 33 - Chapter 33 Understand (from ch. 32) radial vs....

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Understand (from ch. 32) radial vs. bilateral symmetry (32.7), acoelomate vs. pseudocoelomate vs. coelomate (32.8), protostome vs. deuterostome (32.8), and what a lophophore is Understand how sponges feed and why they are an evolutionary dead end Know the major homologies each phylum shares Know the differences between the major classes of cnidarians, flatworms, and mollusks Figure 32.7 Body symmetry Figure 32.8 Body plans of the bilateria Figure 32.9 A comparison of early development in protostomes and deuterostomes Figure 33.2 Review of animal phylogeny Porifera- the sponges 0. Parallel evolution: no tissues, symmetry or gut 1. Flagellated collar cells (choanocytes) filter food from water in in spongocoel 2. Amoebocytes in mesohyl (fluid filled center) carry food in vacuoles to target cells Fig. 33.4 Parazoa- the sponges o Folding of filter chambers allows evolution of larger sponges o Internal skeleton of spicules in mesohyl o Thought to have evolved from choanoflagellates, but
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This note was uploaded on 12/02/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Ch 33 - Chapter 33 Understand (from ch. 32) radial vs....

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