It is not rare. It is merely deep. The Southern Pagurid hermit crab lives below the reach of casual observers, favouring depths from ten to fifty metres. Here, the light is dim and the pressure is constant. It occupies shells of larger gastropods, matching its growing body to the expanding spiral. Found throughout the South Island and lower North Island. Its distribution follows the continental shelf where suitable substrate exists. The range is continuous but patchy, dependent on the presence of dead snails. Without shells, there are no crabs. Threats are indirect. Bottom trawling disturbs the seabed. It crushes shells and buries survivors. The crab cannot dig fast enough. It relies on the natural accumulation of debris. When fishing gear drags across the reef, the home is destroyed. The occupant is exposed. Habitat specificity limits its resilience. It requires hard substrates for attachment points and shelter. Sandy flats are avoided unless scattered with rock or shell. The environment must provide both food and housing. Diet consists of carrion and algae. It feeds on whatever settles on the seafloor. Fish remains, kelp fragments, and organic detritus form the bulk of its intake. It is a cleaner of the deep. It keeps the bottom tidy. No one thanks it.