biology lecture 13

biology lecture 13 - Advanced Learning Techniques Workshop...

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Advanced Learning Techniques Workshop Save time by studying smart What: A workshop for undergraduate students on the science of learning and how to study more effectively and efficiently Where: Burnside Hall Room 920 When: Thursday October 20th 5-7 pm What to bring: Clickers (if you have one), pen/pencil, ID
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2 What am I? As an adult, I live in a mammal’s intestine and feed on blood. I shed my skin. I have a fluid-filled space around my intestine. I have no peritoneum. 1. Flatworm 2. Nematode 3. Annelid
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3 Which annelid group contains broadcast spawners? 1. Polychaetes 2. Oligochaetes 3. Leeches 4. All of the above
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4 Which of the following statements about animal body cavities is true? a. Pseudocoel is lined with peritoneum. b. The coelom, when present, develops within the mesoderm. c. The coelom, when present, is filled with mesenchyme. d. Acoelomates have a much reduced coelom.
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5 A larva a. may be an herbivore. b. looks like a miniature adult. c. cannot be a dispersal stage. d. always has the same diet as an adult.
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6 Review of advancements in animal evolution • Tissues • Digestive gut • Digestive tract • Symmetry • Cephalization • Segmentation • Coelom • Advancements in nervous system
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7 Mollusks How the Nervous system works Oct 18, 2011 blue-ringed octopus
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8 Phylum Mollusca “mollusks”, “shellfish” >100,000 species 2 nd largest animal phylum terrestrial or aquatic highly diverse: - morphology - modes of nutrition - reproduction - response to environment
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9 Phylum Mollusca • bilaterally symmetrical, triploblastic • coelomate protostomes • trochophore larvae (marine mollusks) • major groups: – Class Polyplacophora – Class Gastropoda – Class Bivalvia – Class Cephalopoda • variations on an ancestral molluscan body plan
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10 Mollusk Body Plan 1. foot 3. visceral mass 2. mantle foot visceral mass contains gills (aquatic); acts as lung (terrestrial) mantle cavity
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11 Mollusk Body Plan 1. foot 3. visceral mass 2. mantle mouth anus heart gills shell radula mantle cavity
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12 Class Polyplacophora “many plates” • segmented shell (8 overlapping plates) • multiple gills • omnivorous – radula scrapes algae & bryozoans
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13 Polyplacophorans chiton common to intertidal zones • large muscular foot • ability to roll into a ball • gills located in mantle grooves
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14 Class Bivalvia “two valves” • reduction of head • hinged shell • enlargement of foot foot • mantle cavity modified by siphons • enlargement of gill
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15 Bivalves • siphons
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biology lecture 13 - Advanced Learning Techniques Workshop...

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