Psilaxis radiatusPsilaxis radiatus is a species of sea snail, a marine gastropod mollusc in the family Architectonicidae, which are known as the staircase shells or sundials.DescriptionPsilaxis radiatus has a shell that reaches 26 mm.DistributionThis species can be found in the Indo-Pacific, from the Red Sea and South Africa via Japan, Indonesia, the Philippines and eastern Australia to Hawaii.