http://www.eje.cz strong potential effect on community dynamics and structure, especially due to arthropod predation (Polis, 1990; Polis & Yamashita, 1991). In the Atlantic Forest in Brazil, the litter-dwelling scorpions, Tityus (Archaeotityus) pusillus Pocock 1893 and Ananteris mauryi Lourenço 1982 share the same microhabitat (epi-leaf litter) only during the rainy season, most likely due to the fl ooding of the lower litter layers (Lira et al., 2013). During the dry season, these species use different layers of leaf litter and so avoid intraguild competition; T. (A.) pusillus inhabits the epi-leaf litter (approximately 2-3 cm thick, composed of fallen whole leaves and twigs) and A. mauryi inhabits the sub-leaf litter (3-4 cm thick composed of pieces of leaves in different stages of decomposition) (Lira et al., 2013). However, there is no information on the horizontal distribution of species of Neotropical scorpions. Most studies on the aggregation patterns of invertebrates in forest soil focus on groups other than arachnids (Verhoef & van Selm, 1983;