NanulaNanula is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.DistributionThe species in this genus are endemic to Australia and occur off New [South Wales], South Australia, Tasmania, Victoria and Western Australia.SpeciesNanula flindersi Cotton, B.C. & F.K. Godfrey, 1935Nanula galbina Nanula tasmanica Petterd, W.F., 1879