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Atlantic pigtoe (Fusconaia masonry The Atlantic pigtoe is a sensitive freshwater mussel that was once widespread along the southern Atlantic slope, ranging from the Ogeechee River basin in Georgia north to the James River basin in Virginia. Today, the pigtoe has been lost across 60 percent of its range, and is now only found in mostly struggling populations in North Carolina and Virginia. 83 Fed. Reg. 51,572 (Oct. 11, 2018). The Atlantic pigtoe is 2 inches long, with a yellow and brown streaked shell. It is unique in that its shell is rhomboid in shape and the outer surface has an odd texture like cloth or parchment. These mussels improve water quality by filtering small particles from the water as they feed. More species of freshwater mussels are found in the Southeast than anywhere else in the world,but 75 percent of the region's freshwater mussels are now imperiled. Thirty-six southeastern mussel species have already been lost to extinction. Water pollution from the proposed Efland Station would travel Sevenmile Creek to the Eno River reach of proposed Unit 14 of the Atlantic pigtoe's critical habitat. This 18-mile stretch of the Eno River through Orange and Durham Counties starts below Eno Mountain Road and ends at NC 15- 501. 85 Fed. Reg.59,508 (Sep. 22, 2020). Map of Unit 14 NRI - Upper Neusa.River Subbasin Critical. Habitat !Unit for Atlantic Pigtoe Person Cdunty,Ate 1a Fever ti a,Sln_ ✓... .-_,i `,_ -t3fdFivl11+2�GdE([itty,•N f , Little River Siubbassir c z. 2 L�range county,Roc. ". r Durham Co€n y+ft *arnarwa County,PAC Upper Erk a River s `: II dal ' +r Y� Exao Rives r G v _ r "T J 0 .3 6 12 Miles Critical Habitat F Major Rivers. c� 4,25 815 11 Kilometers City Boundaries County Boundaries Page 14