Leptinaria unilamellata is a species of veterinary importance, being cited here in Pernambuco for the first time. Accounts of both environment and reproduction are made. Ecological observations in a population of Dois Irmãos, Recife, Pernambuco, show predominance in relation to the sympatric snail: Bulimulus tenuissimus, Subulina octona and Sarasinula sp., and showed exceptional ability to adapt to environmental conditions. From August 1982 to November 1983 a total of 1.169 specimens were collected and classified into 8 class sizes. The average occurences in each month indicate that the population is in a state of reproductive equilibrium. Sexual maturity begins at a body length of 6.1 - 7.0 mm, when the specimens (still at half their final lenght) already manifest embryos in the uterus, numbering 1 to 8.