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

4. 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

5. 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

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

7. All bivalves make pearls Sand gets embedded in the mantle Secretion of aragonite and conchiolin

8. 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

9. Elevel, Martina. "Mussels and Clams (Bivalvia)." Bivalvia. N.p., n.d. Web. 26 Mar. 2014.. Morton, Brian. "Food and Feeding." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 26 Mar. 2014.. "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.. 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..