The acocil (Cambarellus montezumae) is a species of crayfish in the family Cambaridae. It is endemic to Mexico, where it is known from Jalisco and Puebla. It is a traditional foodstuff of the Pre-Columbian Mexicans, who boiled or baked the animal, and ate it in tacos.
This is a common species in its range, becoming abundant in some areas. It can be found in a number of aquatic habitat types, including artificial habitats such as canals. It is found in areas with aquatic vegetation, and it often buries itself among the roots. It can tolerate a relatively wide range of temperatures, pH, and oxygen concentrations.