Global Range: Known historically from the Mississippi River basin from southwestern Ohio (Trautman 1981), southern Indiana, and southern Illinois (Smith 1979) to the Gulf of Mexico; also the Gulf Coastal Plain from the Florida panhandle (Gilbert 1992) to Veracruz, Mexico; disjunct occurrences in Nicaragua and northwestern Costa Rica (Wiley 1976, Lee et al. 1980). Now gone or very rare in most of the northern part of the range north of the Gulf Coastal Plain. A single 1.5-m-long individual has been reported from the Sacramento-San Joaquin Delta, California; this introduction was attributed to release by an aquarium hobbyist (Raquel 1992). No other non-native occurrences in the United States are known (Fuller et al. 1999).