[1] The short spire consists of about twelve whorls; the exterior of the shell is white, blotched or spotted with yellow, orange or light tan, and the interior is brown, purple or pink.

Its range extends from Sri Lanka and the eastern coast of India to the Philippines, Japan, Taiwan, Indonesia, Melanesia, Papua New Guinea and northern Australia.

[1] Its typical habitat is a sandy substrate with algae and coral fragments in areas with low turbidity.

S. sinuatus inhabits soft substrates where it feeds on fragments of algae, ingesting sand and detritus, and deriving its nutrition from the decomposing organic material.

[5] It is an active mollusc, able to use its slender foot and robust operculum to flip itself off the seabed, in locomotion or defence.