m ollusca bivalvia
DESCRIPTION
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 PresentationTRANSCRIPT
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Mollusca Bivalvia
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• Class Bivalvia• Formerly known as Pelecypoda• There are more than 15 thousand species of:– Mussels– Oysters– Scallops– Clams– Numerous other families of shells
Introduction
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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
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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
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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
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Making Pearls !• All bivalves make pearls• Sand gets embedded in the mantle• Secretion of aragonite and conchiolin
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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
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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/>.