Molluska Mollusks

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Molluska- Mollusks

• Of all the invertebrates, mollusks probably have
  the widest range of body forms.
• Examples would be Clams, Oysters, Scallops,
  snails, Octopus and Squid.

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Basic Anatomical Characteristics

• 1. All have bilateral symmetry.
• 2. Foot used for transportation, can also be
  adapted for crawling, digging or catching prey.
• 3. Mantle Produces out shell
• 4. Gills mollusks found in water breathe
  through gills similar to those of fish.

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3 Basic Types of Mollusks

• Gastropods Stomach Foot
• 1. Examples would be snails and slugs
• 2. These are the most numerous of all the
  mollusks.
• 3. They have a single shell or none at all.
• 4. Found on land in water (salt and fresh).
• 5. They are herbivores, scavengers or
  carnivores.
• 6. They feed on decaying matter, whether plant
  or animal.
• 7. They have radula. (Tiny teeth located in the
  mouth, used for scraping up food particles.

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Bivalves 2 shells

• 1. 2 shells held together by a hinge or strong
• muscle.
• 2. Examples would be clams, oysters, scallops
• and mussels.
• 3. No radula
• 4. Filter feeders they strain their food
  through
• their gills or capture food as they
  breathe
• 5. Found only in water (fresh and salt).
• 6. Move very slowly using a muscular foot
• 7. Clams move around where oysters stay put.
• 8. They form pearls.

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Cephalopods Brain Foot

• 1. These are mollusks with tentacles.
• 2. Examples would be octopus, cuttlefish,
  nautilus and
• squid.
• 3. Feed with the use of tentacles that formed
  around
• their mouths (some up to 5 meters
  long).
• 4. Nautiluses have an external shell, squid and
  cuttlefish
• have an internal shell
• 5. They have large eyes for excellent night
  (dark) vision.
• 6. Radula tiny teeth located in the mouth,
  used for
• scraping up food particles.
• 7. They all have a complex nervous system
  including
• an extremely large brain making them
  highly intelligent.