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