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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. - PowerPoint PPT Presentation
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Mollusca Bivalvia
• Class Bivalvia• Formerly known as Pelecypoda• There are more than 15 thousand species of:– Mussels– Oysters– Scallops– Clams– Numerous other families of shells
Introduction
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 respirationUsed for trapping food particles
Giant Clam
• 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
Fresh Water Mussels
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
Making Pearls !• All bivalves make pearls• Sand gets embedded in the mantle• Secretion of aragonite and conchiolin
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
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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