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Phylum Molusca 85,000 species “Soft bodied with a hard calcareous shell”
Classes <ul><li>Bivalvia   “head-less” </li></ul><ul><li>Gastropoda  “stomach-foot” </li></ul><ul><li>Cephalopoda    “head...
Class Bivalvia <ul><li>Like all mollusks, </li></ul><ul><ul><li>a clam has a mantle which surrounds its soft body. </li></...
 
Class Gastropoda <ul><li>Snails and slugs </li></ul>
Class Gastropoda <ul><li>Complete gut </li></ul><ul><li>Open circulatory system with primitive heart and hemocyanin pigmen...
 
Class Cephalopoda <ul><li>Complete digestive system  </li></ul><ul><li>Radula – many rows of teeth that form a beak-like s...
 
 
<ul><li>They have the most complex nervous systems of all invertebrates </li></ul><ul><ul><li>Advanced vision, gravity sen...
<ul><li>Cuttlefish  </li></ul><ul><li>http://video.pbs.org/video/1150618835/ </li></ul><ul><li>Octopus </li></ul><ul><li>h...
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Phylum molusca

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Transcript of "Phylum molusca"

  1. 1. Phylum Molusca 85,000 species “Soft bodied with a hard calcareous shell”
  2. 2. Classes <ul><li>Bivalvia “head-less” </li></ul><ul><li>Gastropoda “stomach-foot” </li></ul><ul><li>Cephalopoda “head-foot” </li></ul><ul><li>Polyplacophora </li></ul><ul><li>Monoplacophora </li></ul><ul><li>Pleistomollusca </li></ul><ul><li>Rostroconchia </li></ul><ul><li>Scaphopoda </li></ul><ul><li>&quot;Aplacophora“ </li></ul>
  3. 3. Class Bivalvia <ul><li>Like all mollusks, </li></ul><ul><ul><li>a clam has a mantle which surrounds its soft body. </li></ul></ul><ul><ul><li>It also has a muscular foot for burrowing in mud or sand. </li></ul></ul><ul><ul><li>The soft tissue above the foot is the visceral mass and contains the clam's body organs. </li></ul></ul>
  4. 5. Class Gastropoda <ul><li>Snails and slugs </li></ul>
  5. 6. Class Gastropoda <ul><li>Complete gut </li></ul><ul><li>Open circulatory system with primitive heart and hemocyanin pigment (clear when deoxygenated and blue with oxygenated) </li></ul><ul><li>Respiratory system with primitive lung or gills </li></ul><ul><li>Hermaphrodites that have mating behaviors such as love darts. </li></ul><ul><li>Tentacle stalks with eye spots for sensing the environment (light and dark) but mostly for touch receptors. </li></ul>
  6. 8. Class Cephalopoda <ul><li>Complete digestive system </li></ul><ul><li>Radula – many rows of teeth that form a beak-like structure </li></ul><ul><li>Closed circulatory system - A single systemic heart then pumps the oxygenated blood through the rest of the body </li></ul><ul><li>Use hemocyanin, a copper-containing protein, rather than hemoglobin, to transport oxygen. As a result, their blood is colorless when deoxygenated and turns blue when exposed to air </li></ul><ul><li>Cephalopods exchange gasses with the seawater by forcing water through their gills </li></ul><ul><li>Baby cephalopods look like mini-adults </li></ul>
  7. 11. <ul><li>They have the most complex nervous systems of all invertebrates </li></ul><ul><ul><li>Advanced vision, gravity sensors, a variety of chemical sensors </li></ul></ul><ul><ul><li>Chromatophores for changing color and camouflage - coloured pigments </li></ul></ul><ul><ul><li>Some cephalopods bioluminesce, shining light downwards to disguise their shadows from any predators that may lurk below. </li></ul></ul>
  8. 12. <ul><li>Cuttlefish </li></ul><ul><li>http://video.pbs.org/video/1150618835/ </li></ul><ul><li>Octopus </li></ul><ul><li>http://www.youtube.com/watch?v=H8oQBYw6xxc </li></ul>http://www.youtube.com/watch?v=hcyzr3zJol4
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