A new genus and species of harvestman, landumoema uai, is described based on material from Gruta Olhos d'Água, Minas Gerais State, Brazil. Its troglomorphisms include depigmentation on body, legs and eyes. It is the third troglobitic species of harvestman recorded from Brazilian caves and the second in the family Gonyleptidae.
Arachnida; Opiliones; Gonyleptidae; troglobite; cave fauna