Meleagrina

Margaritiferidae. Of these, 21 have become extinct in the past century, and 70 percent are in danger of extinction. During this same period, engineers have extensively dammed and channeled North America’s rivers. The Tennessee River, for example, is dammed along its entire length from Knoxville,…

Bivalves of the genera Pinctada and Pteria have been collected in many tropical seas for the natural pearls they may contain, although in many countries, most notably Japan, pearl oyster fisheries have been developed. The outer shell of the windowpane oyster, Placuna placenta, is called the capiz shell. It…