Inhabits the regions within the large rivers from the Papaloapan basin in central Veracruz and along the lowlands of the Usumacinta basin in the States of Tabasco and Chiapas, as well as in Campeche, Mexico, through Belize and the large rivers and lakes of the department of Peten on the Atlantic coast of Guatemala. There are no records for this species in either the State of Yucatan or in the northern part of Quintana Roo (Iverson and Mittermeier 1980, Iverson 1992, Campbell 1998, Vogt unpublished data). (See Figure 1 in the attached PDF for a map of the extent of occurrence).