StillaStilla is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.DistributionThis genus occurs off New Zealand.SpeciesSpecies within the genus Stilla include:Stilla anomala Powell, 1955Stilla delicatula Powell, 1927Stilla fiordlandica Fleming C., 1948Stilla flexicostata Stilla paucicostata Powell, 1937