laboratorio de zoologia de invertebrados, facultad de ciencias, montevideo, uruguayabstractin uruguay, two species of temnocephala blanchard, 1849 have been reported on the anomuran crab Aegla Leach, 1920, namely Temnocephala axenos Monticelli, 1899 and Temnocephala talicei Dioni, 1967.A third species, described here as Tenbicephala mertoni n. sp., has been found on Aegla platensisSchmitt, 1942 from southern Uruguay.