Biology 203

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Author:
Brandon47
ID:
121162
Filename:
Biology 203
Updated:
2011-12-06 00:50:02
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Final
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Phylum - Mollusca
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  1. Phylum - Mollusca
    • 1. Bilaterally symmetrical , coelomates
    • 2. Open circulatory system (hemoceol) - well develped heart
    • 3. Complete digestive tract
    • 4. Mantle that secretes calcareous shell plates or shells
    • 5. Inmany species well-developed muscular foot
    • 6. Mouth or buccal region in manyspecies with radula
    • 7. Well-developed nephridia "kidneys"
    • 8. Trochophore larva (expecially in marine forms), most dioecious
  2. Phylum - Mollusca
    class - Bivalvia (=Pelecypoda)
    • 1. Clams,scallops, oysters
    • 2. 15,000+ species
    • 3. Two-valved molluscs
    • 4. Shell produced by mantle
    • 5. Filter feeders (suspension feed)
    • 6. No radula
    • 7. Stong gills (=Ctenidia)
    • 8. Dioecious
    • - Verysuccessful class
    • - Ctenidia are specific to this group.
    • - Filter feeders take in small particles while suspension feeders make use of net or catching devise to bring in food
    • - Have an open circulatory system with a heart
    • - Glochidium - larvae of freashwater clams
  3. Ctenidia are specific to which group?
    • Phylum - Mollusca
    • Class - Bivalvia (=Pelecypoda)
  4. Filter feeders....
    - Take in small particles
  5. Suspension feeders....
    - make use of net or catching devise to bring in food
  6. Glochidium....
    - Larvae of freshwater clams
  7. Ctenidia...
    - Strong gills (Class Bivalvia)
  8. Phylum - Mollusca
    Class - Cephalopoda
    • 1. Octopods, swuids, cuttlefishes,nautius
    • 2. 650 spps. -7,500 fossil forms described
    • 3. Cephalizaion
    • 4. Shell reduced - cuttlefish
    • 5. Possession of chromatophores (pigment cells which give ability to change color)
    • 6. Jaws or beak - ink scs in some species
    • 7. Dioecious
  9. Chromatophores....
    - pigment cells which give ability to change color (Class - Cephalopoda)
  10. Phylum - Mollusca
    Class - Polyplacophora
    • 1. Chitons - 600+ speies - all marine
    • 2. Broad large ventral foot
    • 3. Dorsal surface armed with articulating plates made up of Calcium carbonate (usually 8 plates)
    • 4. Very strong rasping radula
    • 5. Mostly intertidal ingabiting rocky shores
    • 6. Dioecious
  11. Dorsal surface armed with articulating plates made up of Calcium carbonate (usually 8 plates) is a characteristic of which class?
    Class - Polyplacophora
  12. Phylum - Mollusca
    Class - Gastropoda
    • 1. Snails, slugs, nudibranchs (sea slugs)
    • 2. 35,000+ spp. extant - over 15,000 described fossils
    • 3. Marine, freshwater, and tereestrial forms
    • 4. torsion - 180 degree shift in body mass
    • 5. Detorsion - good example nudibranchs
    • 6. Many species carry a shell (snails)
    • 7. Strong radula
    • 8. Dioecious and Monoecious
    • - torsion - the spiraling of the body (ex. to make it more fit for a shell)
    • - detorsion - the straighteding out of the body in adulthood.
  13. Torsion...
    • -180 degree shift in body mass
    • - the spiraling of the body (ex. to make it more fit for a shell)
    • - characteristic of the Class - Gastropoda
  14. Detorsion....
    • - the straightening out of the body in adulthood
    • - good example nudibranchs
    • - Characteristic of the Class - Gastropoda
  15. Phylum - Mollusca
    Class - Monoplacophora
    • 1. Simple single shell (cap-like)
    • 2. "Living Fossils" - rediscovered in 1952 on the coast of Chili in very deep waters.
    • 3. Neopoline - living Genus discovered - now several species have been discribed (11+)
    • 4. Major significance - presence of segmentation - eveolutionary relationships possibly with the Annelids
  16. What class is an example of a "living Fossils" ?
    Class - Monoplacophora

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