phylum mollusca - claremont secondary school · 2011. 12. 4. · phylum mollusca classification...
TRANSCRIPT
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Phylum Mollusca Classification System
4 classes
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Class Gastropoda
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Class Gastropoda: ex. Slug, snail
• Feeding: plants & scavenger
• Radula: yes
• Reproduction:
sexual: dioecious or hermaphrodite
• Locomotion: foot
• Circulation: open
• Shell:
– absent in slug
– External & coiled in snail
• Other features:
Aquatic & land forms
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Sea slugs - nudibranchs
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Limpet
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• Daring escape!!
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Class Bivalvia
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Class Bivalvia: ex. Clam, mussel, oyster, scallop
• Feeding: filter feeder - phytoplankton
• Has radula: no
• Reproduction:
sexual: dioecious
• Locomotion: foot
• Circulation: open
• Shell: external, 2 halves
• Other features:
Byssal threads = mass of threads used for attachment to a substrate.
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Class Cephalopoda
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Ancient Ammonites
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More ammonite fossils
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Nautilus = modern day descendent of Ammonites
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Class Cephalopoda: ex. Squid, octopus, cuttlefish
• Feeding: catch food with tentacles
• Has radula: yes
• Reproduction:
sexual: dioecious
• Locomotion: jet propulsion or tentacles
• Circulation: closed – very active
• Shell: internal for squid & cuttlefish; none for octopus
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Class Cephalopoda continued:
• Other features:
– Ink sac
– Suckers on tentacles
– Large brain, especially the octopus
– Can change colour
– Able to regenerate an arm if lost/taken off
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OCTOPUS
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Class Polyplacophora
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Class Polyplacophora: ex. chitons
• Feeding: scrape algae off rocks
• Has radula: yes
• Reproduction:
sexual: dioecious
• Locomotion: foot
• Circulation: open
• Shell: external – 8 overlapping shells
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Polyplacophora
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Gumboot Chiton