Sason sundaicum is a species of barychelid trapdoor spiders that is found on trees near the sea, usually closer than 100 meters, although distances of up to five kilometers have been observed. They build short nests with two opposing trapdoors, often attached to the bark of living trees, for example Coconut Palms. However, sometimes a nest is built on sides of large boulders. Nests of males are up to two centimeters long, those of females up to almost three centimeters. The migid spider Poecilomigas abrahami from South Africa builds very similar nests.1
^ Schwendinger, P.J. (2003). Two new species of the arboreal trapdoor spider genus Sason (Araneae: Barychelidae) from Southeast Asia. The Raffles Bulletin of Zoology 51(2):197-207. PDF