Chapter 16 - Two valves of shell • Head reduced or absent...

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CHAPTER 16 MOLLUSCS
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Outline Phylum Mollusca General characteristics Class Polyplacophora Class Gastropoda Class Bivalvia Class Cephalopoda
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Phylum Mollusca True coelom Bilateral symmetry No segmentation Shell in most
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Phylum Mollusca Organ systems Gills or lungs Open circulatory system Paired ganglia Mantle Radula Muscular foot
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Class Polyplacophora Flat body 8 plates Broad foot Gills Dioecious Chitons
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Class Gastropoda Coiled shell in most Distinct head Large foot 1 to 2 gills Cerebral ganglia Dioecious or monoecious Snails and slugs
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Figure 16.13a
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Figure 16.23a
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Class Bivalvia
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Unformatted text preview: Two valves of shell • Head reduced or absent • No radula • Wedge-shaped foot • Plate-like gills • Dioecious Figure 16.co Class Cephalopoda • Shell absent or internal • Developed head • Arms and/or tentacles • Siphon is modified foot • Brain • Closed circulatory system • Dioecious • Octopus, squid, and cuttlefish Review • Phylum Mollusca General characteristics Class Polyplacophora Class Gastropoda Class Bivalvia Class Cephalopoda Reminders • Read Chapter 16 • Lab Practical 2 • Lecture Exam 4 • Quiz 2...
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This note was uploaded on 04/03/2008 for the course BIOL 1413 taught by Professor Veazey during the Spring '08 term at Southwest Texas Junior College.

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Chapter 16 - Two valves of shell • Head reduced or absent...

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