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Molluska powerpoint.pptx

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Dr. Manoj Garg
Dr. Manoj Garg

Mollusks are soft-bodied animals that usually have an internal or external shell. They have four main body parts: a foot, mantle, shell, and visceral mass. There are three main groups of mollusks - gastropods, which have a single shell and move using a foot; bivalves, which have two shells held together by muscles; and cephalopods like squid and octopus, which have a soft body with a head attached to tentacles or arms and can move by jet propulsion.

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Phylum: Mollusca Gastropods, Bivalves & Cephalopods
Mollusks Mollusks are soft- bodied animals that usually have an internal or external shell. Ex. Clams, squid, octopi, mussels, nudibranchs. They have a free swimming larval stage called a trochophore.
Body Plan 4 parts 1. foot used for crawling, burrowing and tentacles 2. mantle thin layer of tissue that covers organs 3. shell made by glands in the mantle that secrete calcium carbonate 4. visceral mass guts. (internal organs)
Feeding Feeding radula ribbon of teeth Others are filter feeders using an incurrent and excurrent siphon
Respiration and Circulation Respiration gills Circulation - Open circulatory system heart and open sinuses. Open works for slow moving creatures Closed circulatory system blood is contained in veins and arteries. Octopi and squid
Response/Movement/Reproduction Response- Clams- simple nervous system/eyespot Octopi brains, complex behavior. Octopi and squid can open jars for reward or to avoid punishment Movement mucus with the foot/muscle or jet propulsion for the octopus. Reproduction usually external fertilization in the water. Some tentacled mollusks do internal fertilization. Some can be hermaphrodites.
3 main groups of Mollusks 1. Gastropods shell-less or single shelled mollusks that move by using a muscular foot. Ex. Sea hares can squirt ink at predators Nudibranches sea slugs, have chemicals in their bodies that taste bad. Can recycle nematocysts from cnidarians they eat.
3 main groups of Mollusks 2. Bivalves two shells held together by two powerful muscles. Ex. Clams, oysters, mussels and scallops. Scallops can flap their shells to move when threatened. Filter water over gills use mucus and cilia on gills to trap food particles.
3 Main Groups of Mollusks 3. Cephalopods head-footed . Soft bodied. The head is attached to a single foot. The foot is divided into tentacles or arms. Example: squid, octopus, nautilus, cuttlefish. They move by jet propulsion. Many have an ink sac to distract potential predators. They have a pen for a backbone.

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Molluska powerpoint.pptx

  • 2. Mollusks Mollusks are soft- bodied animals that usually have an internal or external shell. Ex. Clams, squid, octopi, mussels, nudibranchs. They have a free swimming larval stage called a trochophore.
  • 3. Body Plan 4 parts 1. foot used for crawling, burrowing and tentacles 2. mantle thin layer of tissue that covers organs 3. shell made by glands in the mantle that secrete calcium carbonate 4. visceral mass guts. (internal organs)
  • 4. Feeding Feeding radula ribbon of teeth Others are filter feeders using an incurrent and excurrent siphon
  • 5. Respiration and Circulation Respiration gills Circulation - Open circulatory system heart and open sinuses. Open works for slow moving creatures Closed circulatory system blood is contained in veins and arteries. Octopi and squid
  • 6. Response/Movement/Reproduction Response- Clams- simple nervous system/eyespot Octopi brains, complex behavior. Octopi and squid can open jars for reward or to avoid punishment Movement mucus with the foot/muscle or jet propulsion for the octopus. Reproduction usually external fertilization in the water. Some tentacled mollusks do internal fertilization. Some can be hermaphrodites.
  • 7. 3 main groups of Mollusks 1. Gastropods shell-less or single shelled mollusks that move by using a muscular foot. Ex. Sea hares can squirt ink at predators Nudibranches sea slugs, have chemicals in their bodies that taste bad. Can recycle nematocysts from cnidarians they eat.
  • 8. 3 main groups of Mollusks 2. Bivalves two shells held together by two powerful muscles. Ex. Clams, oysters, mussels and scallops. Scallops can flap their shells to move when threatened. Filter water over gills use mucus and cilia on gills to trap food particles.
  • 9. 3 Main Groups of Mollusks 3. Cephalopods head-footed . Soft bodied. The head is attached to a single foot. The foot is divided into tentacles or arms. Example: squid, octopus, nautilus, cuttlefish. They move by jet propulsion. Many have an ink sac to distract potential predators. They have a pen for a backbone.