Mollusks<br />Kingdom Animalia<br />Phylum Mollusca<br />	Class Gastropoda<br />	Class Bivalvia<br />	Class Cephlapoda<br />
Mollusks<br />50,000 species<br />10 classes<br />Includes:<br />Squid<br />Octopus<br />Clams<br />Conches<br />Snails<br...
Basic Anatomical Structures:<br />a) Mantle – muscular bag that surrounds the gills and most organs and is used to circula...
Basic Anatomical Structures:<br />b) Foot – muscular structure used for movement<br />		1. In snails & slugs it’s used to ...
Basic Anatomical Structures:<br />c) Radula – a tongue like structure with scraping teeth<br />
Class Gastropoda<br />Includes snails, slugs, whelks, & abalone<br />Defining Characteristics:<br /><ul><li>Radula
Some have a shell
Sensitive Tentacles
Shell-less members can produce toxins or store eaten nematocysts</li></li></ul><li>
Snails				Sea SlugsWhelks				Abalone<br />
Class Bivalvia:<br />Includes clams, oysters, mussels, scallops<br />Defining characteristics:<br /><ul><li>Two hinged shells
No head, but sensory organs on shells edge
Two siphons extend out of the shell
Mantle pumps water</li></li></ul><li>
Clam				OysterMussel				Scallop<br />
Clam				OysterMussel				Scallop<br />
Pearl Making Abilities<br />When ever sand or an irritant gets inside a shell of an oyster, it coats it in a substance cal...
Class Cephalopoda<br />Includes squid, octopus, nautilus, cuttlefish<br />Defining Characteristics:<br /><ul><li>Little to...
Ink sac
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12. Phylum Mollusca Notes

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12. Phylum Mollusca Notes

  1. 1. Mollusks<br />Kingdom Animalia<br />Phylum Mollusca<br /> Class Gastropoda<br /> Class Bivalvia<br /> Class Cephlapoda<br />
  2. 2. Mollusks<br />50,000 species<br />10 classes<br />Includes:<br />Squid<br />Octopus<br />Clams<br />Conches<br />Snails<br />Sea slugs<br />Oysters<br />
  3. 3. Basic Anatomical Structures:<br />a) Mantle – muscular bag that surrounds the gills and most organs and is used to circulate water<br />1. some use it to circulate water or jet propulsion<br />2. secretes calcium carbonate shell<br />
  4. 4. Basic Anatomical Structures:<br />b) Foot – muscular structure used for movement<br /> 1. In snails & slugs it’s used to crawl<br /> 2. In bivalves it’s used to dig <br /> 3. In squids, it takes the form of tentacles<br />
  5. 5. Basic Anatomical Structures:<br />c) Radula – a tongue like structure with scraping teeth<br />
  6. 6. Class Gastropoda<br />Includes snails, slugs, whelks, & abalone<br />Defining Characteristics:<br /><ul><li>Radula
  7. 7. Some have a shell
  8. 8. Sensitive Tentacles
  9. 9. Shell-less members can produce toxins or store eaten nematocysts</li></li></ul><li>
  10. 10. Snails Sea SlugsWhelks Abalone<br />
  11. 11. Class Bivalvia:<br />Includes clams, oysters, mussels, scallops<br />Defining characteristics:<br /><ul><li>Two hinged shells
  12. 12. No head, but sensory organs on shells edge
  13. 13. Two siphons extend out of the shell
  14. 14. Mantle pumps water</li></li></ul><li>
  15. 15. Clam OysterMussel Scallop<br />
  16. 16. Clam OysterMussel Scallop<br />
  17. 17. Pearl Making Abilities<br />When ever sand or an irritant gets inside a shell of an oyster, it coats it in a substance called nacre, creating a pearl<br />Pearl farmers put seeds inside oysters to create pearls<br />
  18. 18. Class Cephalopoda<br />Includes squid, octopus, nautilus, cuttlefish<br />Defining Characteristics:<br /><ul><li>Little to no shell, ranging from gastropod like shell (nautilus) to internal leaf like shell (cuttlefish) to thin internal bar called a pen (squid) to nothing (octopus)</li></li></ul><li>Class Cephalopoda<br />Defining Characteristics:<br /><ul><li>Specialized foot called a siphon for jet propulsion
  19. 19. Ink sac
  20. 20. Chromatophores – cells that can change color
  21. 21. Complex nervous systems consisting of large eyes and critical thinking abilities</li></li></ul><li>Octopus<br /><ul><li>8 arms
  22. 22. Beak like jaws
  23. 23. No shell
  24. 24. Bottom dwellers</li></li></ul><li>Squid<br /><ul><li>Better adapted for swimming due to elongated body and two fins formed by the mantle
  25. 25. Ten arms, two of which are longer are called tentacles
  26. 26. A reduced shell called the pen can be found embedded in the upper surface</li></li></ul><li>Cuttlefish<br /><ul><li>Resemble squids
  27. 27. Eight arms and two tentacles
  28. 28. Flattened with a fin along the sides
  29. 29. Internal Shell</li></li></ul><li>Nautilus<br /><ul><li>Smooth exterior shell
  30. 30. Contains several gas filled chambers that aid in buoyancy
  31. 31. Has 60-90 arms to catch prey</li>
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