Shell thick, stout, about twice as high as broad, of 7-8 rather flat whorls. Sculpture on spire whorls of three equally spaced beaded cords; beads prominent and aligned axially so as to form ribs. Body whorl with a blunt varix opposite the outer lip. Aperture ovate, with a short, rather constricted siphonal canal, and opposite to it a well-defined anal canal delimited by a denticle on the columella.
variable, with a whitish background and usually dark beads or series of dark spots on the cords; occasionally with dark spiral lines, bands, or interspaces of cords.
common size :
The general appearance of this species resembles Cerithium caeruleum Sowerby, 1855, but it is distinguished by having three rows of beads instead of a poorly defined knobbed keel on the spire whorls.
BIOLOGY / ECOLOGY
Egg masses are deposited as long ribbon-like masses containing thousands of eggs, and the larvae are planktotrophic.
in the Red Sea, this species usually occurs in large numbers on high rocky intertidal platforms (Houbrick, 1985) and partially buries in the patches of sand during low tide.