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. The name acocil comes from the Nahuatl cuitzilli, meaning "crooked one of the water" or "squirms in the water". It is a traditional foodstuff of the Pre-Columbian Mexicans, who boiled or baked the animal, and ate it in tacos.