Purpuradusta gracilis (Gaskoin, 1849)
Uncommon in the Solitary Islands Marine Park. General distribution through the Indo-West Pacific. In Australia recorded from central Western Australia, across the north to Queensland and south to central NSW.
Found intertidally on rocky shores, rock platforms.
Shell small, solid with fine and numerous teeth. Base and lower sides pale/white with conspicuous brown spots. Dorsal surface pale grey/blue with many scattered small brown spots, usually a large central brown blotch. Mantle transparent greyish with whitish coloured papillae. Grows to 25mm.