Abstract
ABSTRACT The red swamp crayfish Procamharus clarkii (Girard, 1852) is a native widespread aquatic species from the northern part of the state of Nuevo Leon, Mexico (Rio Salado basin), but it is an exotic species in the central area of the state (Rio San Juan basin). There, P. clarkii appears to be replacing the native Procambarus regiomontanus Villalobos, 1954. At present, P. regiomontanus is known to occur in only two disjunct localities, Canoas Park, near Monterrey, and the spring pool, El Sabinal, at Cerralvo. The dwarf crayfish Cambarellus alvarezi Villalobos, 1952, as well as two endemic fish species, Megupsilon aporus Miller and Walters, 1972, and Cyprinodon alvarezi Miller, 1976, from Ejido El Potosi, municipality of Galeana, are threatened with extinction, due to a severe habitat reduction. The taxonomy, distribution, and status for two additional and presumably undescribed crayfish species from central and south Nuevo Leon need to be updated.
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