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Phylum Mollusca

Phylum Mollusca. Peterson, Science. Phylum Mollusca. Who are they? Divided into three Classes Gastropods Bivalves Cephalopods Lets take a look at some examples…. Phylum Mollusca. Class Gastropods = “stomach foot” Examples: Snails and slugs Abalone Garden Snail Tuchan Snail.

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Phylum Mollusca

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  1. Phylum Mollusca Peterson, Science

  2. Phylum Mollusca • Who are they? • Divided into three Classes • Gastropods • Bivalves • Cephalopods • Lets take a look at some examples…

  3. Phylum Mollusca • Class Gastropods = “stomach foot” • Examples: Snails and slugs • Abalone • Garden Snail • Tuchan Snail

  4. Phylum Mollusca • Class Bivalves = “2 shells” • Examples: Clams, oysters, scallops, mussel… • Clam • Scallops • Mussel • Oyster

  5. Phylum Mollusca • Class Cephalopods • Examples: Octopus, cuttlefish, squid… • Octopus • Squid • Nautilus

  6. Phylum Mollusca • Gastropods • How do they eat? • Radula – tongue-like organ with rows of teeth • Some are herbivores, carnivores, scavengers… • How do they move? • Rhythmic contractions of muscular foot • Slide on mucus

  7. Phylum Mollusca • Gastropods • Do they have a shell? • Most do (coiled) - snail • Some don’t - slug • Adaptations • Can live in water or on land • Can have a “trap door” • Other Interesting Facts • Mucus helps them slide • Largest mollusk group

  8. Phylum Mollusca • Bivalves • How do they eat? • Filter-feeders (strain food from water) • Gills capture food as they breathe (mucus) • How do they move? • Scallops – open/close shells • Clams can burrow • Most adults don’t move much

  9. Phylum Mollusca • Bivalves • Do they have a shell? • Yes (DUH) – hinged, 2-part shell • Adaptations • Live in water • Can burrow or open/close to escape • Other Interesting Facts • Oysters/mussles can make pearls when irritated

  10. Phylum Mollusca • Cephalopods • How do they eat? • Catches food with tentacles/suckers • Predators/Carnivors • How do they move? • Jet propulsion (balloon like) • Octopus - creeps

  11. Phylum Mollusca • Cephalopods • Do they have a shell? • Some do (i.e. nautilus and squid) • Adaptations • Adapted for swimming • Large, well-developed head and brain • Other Interesting Facts • Closed circulatory system • Fast = squid 6m/s

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