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Mollusks

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7 diapositives · 732 Views · Jul 19, 2014

Mollusks. Katie Landry Mitchell Palmer Tiara Gandy Stephen Puhalla. Mollusk Characteristics. Mollusks don’t have a backbone, which means they are invertebrates. Mollusks reproduce by sexual reproduction. They can live in water or on land. It is able to move.

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Mollusks
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  1. Mollusks Katie Landry Mitchell Palmer Tiara Gandy Stephen Puhalla

  2. Mollusk Characteristics • Mollusks don’t have a backbone, which means they are invertebrates. • Mollusks reproduce by sexual reproduction. • They can live in water or on land. • It is able to move. • Some mollusks eat by filtering water through gills. • They are complex animals. • They have a muscular foot that helps them move and hunt. • They are soft-bodied. • Mollusks have digestive, respiratory, circulatory and nervous systems. • Many have outer shells.

  3. Bivalves • Bivalves are one of the three types of mollusks. • They have a hard shell that is made up of two matching halves. • The shell completely encloses the body. • They have sensory organs and a mouth. • In order to move, they balance upright, open their shell, and extend their feet. • The foot is also used for burrowing and digging in the sand. • They have gills that filter dissolved oxygen from water. • In most bivalves, the gills also filter food from the water.

  4. Gastropods • Gastropods are one of the other types of mollusks. • Their head is found at the end of the foot. • Most gastropods have a cutting mouth part called a radula, which shreds their food. • Some eat animals, but most eat plants or algae. • Gastropods have gills if they live in the water, but gastropods have lungs if they live on land. • They are the most diverse mollusk group.

  5. Cephalopods • Cephalopods are the last type of mollusks. • They are saltwater creatures. • They have the most well-developed body system of all types of mollusks. • They have well-developed nerves and a brain. • They have tentacles for catching prey. • Cephalopods have three hearts. • They don’t have shells, which helps them move freely. • They release ink like fluids, and they camouflage to protect themselves. • Nautiluses are the only cephalopod with a shell.

  6. Examples of Mollusks • Bivalves - Clams, Oysters, and Mussels- from left to right • Gastropods - Snails, Slugs, and Whelks- from left to right • Cephalopods - Octopi, Squids, and Nautiluses- from left to right

  7. Works Cited • http://infusion.allconet.org/webquest/PhylumMollusca.html • http://www.assateague.com/nt-bival.html • http://www.kidport.com/reflib/science/animals/mollusks.htm • http://www.mbgnet.net/salt/coral/animals/mollusk.htm