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M ollusca Bivalvia

M ollusca Bivalvia. Introduction. Class Bivalvia Formerly known as Pelecypoda There are more than 15 thousand species of: Mussels Oysters Scallops Clams Numerous other families of shells. Characteristics. All shells have two pieces known as valves In most, valves are similar size.

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M ollusca Bivalvia

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  1. Mollusca Bivalvia

  2. Introduction • Class Bivalvia • Formerly known as Pelecypoda • There are more than 15 thousand species of: • Mussels • Oysters • Scallops • Clams • Numerous other families of shells

  3. Characteristics • All shells have two pieces known as valves • In most, valves are similar size. • Shells vary greatly in size, color, and ornamentation • The foot of bivalves is adapted for burrowing in all species, except for the sedentary ones • Some use the foot to hop from place to place • Some have siphons • Most have single pair of large gills • Used for respiration • Used for trapping food particles

  4. Giant Clam Fresh Water Mussels • Freshwater mussels can be less than .1 inches • Giant clam shell can exceed 4 feet in length • 582 pounds • Can live up to 40 years

  5. Feeding • Filter Feeders & how they work • Plankton, larvae, eggs and detritus • Modern issues in filter feeding • Susceptibility to harmful pollutants • Algal blooming • Effects on humans

  6. Making Pearls ! • All bivalves make pearls • Sand gets embedded in the mantle • Secretion of aragonite and conchiolin

  7. Evolution • Development of simple eyes in swimming bivalves • After the ability to swim • Ability to burrow • Foot • sihpons • No need to develop a head • Evolution of their shell • Scallop video

  8. References • Elevel, Martina. "Mussels and Clams (Bivalvia)." Bivalvia. N.p., n.d. Web. 26 Mar. 2014. <http://www.molluscs.at/bivalvia/index.html?/bivalvia/main.html>. • Morton, Brian. "Food and Feeding." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 26 Mar. 2014. <http://www.britannica.com/EBchecked/topic/67293/bivalve/35739/Food-and-feeding>. • "Water Encyclopedia." Bivalves. N.p., n.d. Web. 26 Mar. 2014. http://www.waterencyclopedia.com/Bi-Ca/Bivalves.html • "Mollusks." Mollusks. N.p., n.d. Web. 26 Mar. 2014. <http://www.mbgnet.net/salt/oceans/animals/mollusk.htm>. • Madrigal, Alexis C. "Did You Know Scallops Have *Eyes*? Me Neither, but Look." The Atlantic. Atlantic Media Company, 28 Mar. 2013. Web. 01 Apr. 2014. <http://www.theatlantic.com/technology/archive/2013/03/did-you-know-scallops-have-eyes-me-neither-but-look/274469/>.

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