|
|
|
|
Rough
Pigtoe, Pleurobema
plenum
photo courtesy of USFWS
The federally
endangered rough pigtoe has a shell that is shaped like an equilateral
triangle, with a brown, satin-like appearance and a moderately deep beak
cavity. The periostracum is
yellowish brown or light brown in small shells, becoming dark brown in
adults, with faint green rays visible near the beaks in some shells. The nacre is usually white, occasionally pink.
Pseudocardinal teeth are well developed; there are two in the left
valve and one in the right. The lateral teeth are straight. The rough pigtoe is found in
medium to large rivers in sand or gravel.
|
|
