4 sites; NT is under-surveyed for terrestrial molluscs. Many more occurrences expected.4 sites, all very close so range Extent very small. First found in 2013 (Hay River), but not rare. Left bank, Hay River, above Alexandra Falls, E of Sandy River bridge, S side, Fort Smith Hwy 5Left bank, Hay River: above Louise Falls, Escarpment Creek, E of MacKenzie Hwy 2