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Characteristics of the Phylum Mollusca (5)
- Soft body
- Bilateral symmetry
- Alimentary Canal
- Sexual Reproduction
Unique Characters of Phylum Mollusca (3)
- Muscular foot
Shared Molluscan features (4)
- Venral muscular foot
- Veisceral Mass
- Dorsal Mantle
Dorsal Mantle of Mollusca
Cell layer that secretes shell
Predation & defense
Houses gills/lungs that develop from the mantle & through which water is pumped through
What does the mantle cover?
Molluscan gas exchange (3)
- Occurs within the mantle cavity
- Cutaneous respiration
- Use gills (ctenidia)
Feeding & Digestion (2)
- Complete digestive system
- Varied food sources
Class Gastropoda (2)
- Snails, abalones
- One spiraled shell
Land snails (2)
- Gills don't work well
- Lining of mantle cavity functions as lung
Land slugs (2)
- Hermaphrodites/ impregante each other
- Have elaborate mating rituals
Class Bivalvia (5)
- Shells have two halves
- No head or radula
- Most are sessile
- Use muscular foot to bury themselves
- Water drawn in through incurrent siphon
- Passes over ctnedia and the food particles in water are captured
What bivalve body part allows water in and out?
Bivalve Adaptations (3)
- Soft bottom habitat (clams burrow into sand)
- Rocky intertidal habitats (mussels attach to rocks)
- Underwater rock surfaces (Oysters secrete "cement")
What do mussels use to attach themselves to rocks?
Class Polyplacophora (4)
- Eight shell plates
- Radula scrapes algae
- Attach to rocks with their foot
What does Cephalopod mean?
What happens to the gastropod foot?
Modified to muscular siphons, head, tentacles
Cephalopod Characteristics (4)
- Active predators with beak-like jaws
- Well developed nervous system with a brain
- Excellent vision
- Can change skin colors
Specialized pigment cells that cephalopods use to change skin colors
The Nautilus (2)
- Ancient, deep water cephalopod
- Moves up and down water column by regulating amount of gas in chambers
- Grasp prey and mates with tentacles
- Fins act as rudders
- Shell reduced to stiff internal pen
- 8 arms
- Shell completely lost
- most advanced and complex nervous system
Where are most of the neurons in an octopus found?
In their arms
How do octopuses use vision other than for predatory purposes?
Vision is used in sexual courtship, and social communication
What is an analogous structure of the octopus?
Camera lens eye- similar to vertebrate eye, but it evolved independently
What is a something that octopus adopted?
A highly specialized nervous system for hunting and surviving
Are octopuses intelligent? (5)
- Use tools for defense
- Can solve problems
- Show long-term memory
- Can recognize human caretakers
How are octopuses similar to humans? (2)
- Adapted a highly specialized nervous system for hunting and surviving
- Solitary, short lived animals
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