Pseudemys concinna gorzugi

The Rio Grande cooter is found in a narrow band following the Rio Grande to Del Rio and then branching off into the Devil's and Pecos rivers for a few miles. There are also disjunct populations in the Guadalupe Mountains.
It is a fairly large turtle. The females reach about 16-17 inches in length. The males usually reacy 10-12 inches.
The populations in the Rio Grande are declining because of increased pollution. This pollution is due, in part, to U.S. companies operating on the Mexican side of the Rio Grande, where pollution is loosely (if at all) controlled.