RESUMEN Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae), molusco dulceacuicola del que se colectaron 125 especimenes en el lago del Jardin Botanico Joaquin Antonio Uribe de Medellin. En el laboratorio se individualizaron y se estimulo la emision cercariana con una fuente luminosa. El 9,6 % de los caracoles emitio cercarias. Los moluscos emisores se sacrificaron para obtener los demas estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfologicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae) y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, asi como la especificidad de los filoftalmidos por moluscos hospedadores de la superfamilia Cerithioidea. Palabras claves: cercarias, digenea, Melanoides tuberculata , Philophthalmidae, Redias. ABSTRACT The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae) are described. 125 snails from the Medellin’s Botanical Garden Joaquin Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae) was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed. Key words: Cercariae, Digenea, Melanoides tuberculata , Philophthalmidae, Rediae.