Lustrochernes grossus

We analysed the dead-wood characteristics that determine the presence of saproxylic pseudoseorpion species in remnants of riparian cloud forest. We examined 98 dead-wood pieces (70 logs and 28 stumps), and recorded tree species. decaying wood stages, presence of the pseudoseorpion Lustrochernes grossus (Banks. 1893) (Chernetidae) and the Bess beetle Helieus tropicus. In these wood samples we found 24 L. grossus and one chela. We recorded the highest number of individuals in Clethra mexicana (11). followed by Quercus corrugata (6) and Liquidambar styraciflua (6). In Annona cherimola and Trema micrantha, one chela and one female were recorded, respectively. The presence of this pseudoseorpion is likely due to its relationship with the Bess beetle, which coexists in decaying wood. The distribution of L. grossus in dead wood may also be influenced by tree species and stage of decay. Forest fragmentation and the extraction of firewood from the remnant riparian fragments of cloud forest are factors that could jeopardize the saproxylic pseudoseorpion species and other arthropod diversity associated with decaying wood in this threatened ecosystem.