Gnammas (rock holes) can occur stochastically on rock pavements over much of Australia. In the benign south they can be common and have a diverse fauna, but those in deserts are hardly known and different. A well spaced set in the Gibson Desert of Western Australia were sampled in mid 2017 and again in mid 2018 by pond netting. They occur in laterite and have a distinctive pipe-like form and mode of origin. The later involves vertical solution in an already weathered reconstituted rock aided by thirsty kangaroos excavating for water as the pools dry. This is very different from the pans and pits in granite in southern Australia. Macroinvertebrate communities in these gnammas have an average of six species momentarily present, drawn from a limited set of eight crustacean species with perhaps a few insect individuals drawn from an array of 21 species. Invertebrate dispersal is extremely limited with crustaceans surviving dry periods as randomly inactively distributed eggs and insects recolonising actively from the better watered west in each filling event. It is this plus their small size and homogeneity that limits biotic diversity.