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Mollusca 4 classes near shore 4 classes near shore Gastropoda- The snails Gastropoda- The snails Polyplacophora- Chitons Polyplacophora- Chitons Bivalva-Two.

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Presentation on theme: "Mollusca 4 classes near shore 4 classes near shore Gastropoda- The snails Gastropoda- The snails Polyplacophora- Chitons Polyplacophora- Chitons Bivalva-Two."— Presentation transcript:

1 Mollusca 4 classes near shore 4 classes near shore Gastropoda- The snails Gastropoda- The snails Polyplacophora- Chitons Polyplacophora- Chitons Bivalva-Two shelled Bivalva-Two shelled Cephalopoda- Squid & octope Cephalopoda- Squid & octope

2 Molluscan Body Soft bodies Soft bodies Two main parts: head-foot, visceral mass Two main parts: head-foot, visceral mass Visceral mass: Organ systems Visceral mass: Organ systems Head-foot: Head, foot, sensory,and foot Head-foot: Head, foot, sensory,and foot Visceral mass is covered by the mantle which forms the shell Visceral mass is covered by the mantle which forms the shell Radula- teeth Radula- teeth

3 Feeding Herbivores, carnivores,filter, detritivores or parasites Herbivores, carnivores,filter, detritivores or parasites Use of a siphon or radula Use of a siphon or radula

4 Mollusk

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6 Gastropods Examples: snails, whelks, cowries Examples: snails, whelks, cowries Muscular foot Muscular foot Micro to 3 feet long Micro to 3 feet long Foot acts as door Foot acts as door Some scrape algae from rocks Some scrape algae from rocks Conchs eat seagrasses Conchs eat seagrasses

7 Gastropods cont. Some have a radula covered with toxins Some have a radula covered with toxins Most have separate sexes Most have separate sexes Internal fertilization for most Internal fertilization for most

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12 Slipper snails Hermaphroditic Hermaphroditic Stacked on top of each other Stacked on top of each other Young are always male Young are always male Can stay male or change to female Can stay male or change to female Cannot go back to male Cannot go back to male

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14 Chitons Flat bodies- low profile Flat bodies- low profile 8 plates 8 plates Eats algae Eats algae Found on intertidal rocks Found on intertidal rocks Lethargic Lethargic

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16 Bivalves Two shells Two shells Muscles hold them together Muscles hold them together No head No head No radula No radula

17 Feeding Cilia form currents to fill body cavity with water Cilia form currents to fill body cavity with water Mucus traps food on the gills Mucus traps food on the gills

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19 Cephalopods Soft bodied mollusk. Soft bodied mollusk. Foot is divided into tentacles or arms. Foot is divided into tentacles or arms. Octopi, squids, cuttlefish, and nautiluses. Octopi, squids, cuttlefish, and nautiluses.

20 Squids, Octopods, and Cuttlefish Bulky bodies Bulky bodies 8 arms, 2 tentacles 8 arms, 2 tentacles Chromatophores Chromatophores Jet propulsion Jet propulsion Ink gland Ink gland

21 Cuttlefish

22 Nautilus


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