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Stomach contents of 54 Peltocephalus dumerilianus from the Yagua and Atacavi rivers, Amazonas State, Venezuela, were obtained by stomach flushing. Fruits and seeds, fish, and aquatic plants were the most common food items in the diet; invertebrates and algae also were eaten. The most common plant species in the diet were Mauritia flexuosa, Montrichardia arborescens, Parinari campestris, and Thurnia polycephala. The proportion of animal matter ingested by P. dumerilianus was the highest recorded among South American pelomedusid turtles. Diet composition was not significantly affected by sex or body size. Significant differences in diet were found between turtles from the two rivers, mainly because fruits and seeds were more diverse in diets of turtles from Atacavi River. /// Contenidos estomacales de 54 ejemplares de Peltocephalus dumerilianus ("cabezón"), provenientes de los caños Yagua y …