Shell high-spired, fusiform with 12-14 rather flat sided whorls, of porcellaneous aspect; middle part of spire more parallel sided than the apical end. Sculpture of 4-5 beaded spiral cords and of minute striae between the cords. Several flat varixes along the spire, usually one of them opposite the aperture. Body whorl rounded with beaded spiral cords becoming more crowded on the base. Outer lip smooth inside, hardly thickened outside. Siphonal canal short and broadly open.
white, with faint yellowish spots along spiral rows.
common size :
Mediterranean specimens 14 mm, up to 22 mm in the Indo-Pacific.
This species is distinctive by its porcelaneous aspect. The only possible confusion with native species is with some morphs of C. lividulum Risso, 1826, but these are darker with brown-green mottles and do not have that glossy surface.
BIOLOGY / ECOLOGY
Larvae are planktotrophic, ensuring long-distance dispersal.
in the Indo-Pacific, C. nesioticum is found in shallow water habitats of well-oxygenated locations, on mixed bottoms of sand and rock, or sandy pockets of rocky nearshore bottoms (Houbrick, 1992). It may be a dominant species in such environments of the Red Sea.