Nitor medioximus is a species of small air-breathing land snail and terrestrial pulmonate gastropod mollusk in the family Helicarionidae. This species is endemic to Australia and grows to about 12 mm in diameter.Australian Land Snails Volume 1, A field guide to eastern Australian species’ J.Stanisic, M.Shea, D. Potter & O. Griffiths. Bioculture Press, Mauritius, 2010
References
Further reading https://biodiversity.org.au/afd/taxa/Nitor_medioximus PDF of Malacologia article on forest snail faunas of NE New South Wales and SE Queensland, mentioning this species Government biodiversity summary for New South Wales, Northern Rivers region lists this species