The paper reports the results of preliminary toxicity tests monitoring adult and larval stages of T. fulvus survival in presence of two heavy metals (Cu and Cd). Data indicate males as more senisitive than females to presence of both contaminants and nauplii as the most sensitive of all. The ease of culturing and the values of LC50 comparable to those of other test-species suggest the possible use of this meiobenthic crustacean in ecotoxicology studies