Shell very slender, high-spired, about 4.5 times as long as wide, of 13-17 whorls (not counting the protoconch whorls usually eroded in the adult). Sculpture on early spire whorls of two spiral cords at some distance from the suture, on later spire whorls rising to 6-7 spiral cords running quite close to each other and alternating one stronger and one weaker, the subsutural cord stronger and with more conspicuous knobs. Weak axial folds determine knobs at their intersection with the spirals, and there are also a few varixes along the spire. Body whorl very slightly expanded. Aperture with a somewhat thickened outer lip, smooth inside, and a moderately long, quite open siphonal canal.
pale buff background with irregular brownish areas, the interspaces between spiral cords usually darker.
common size :
commonly 20-30 mm high, up to 40 mm in Mediterranean specimens and 50 mm in the Indo-Pacific.
This species is distinguished from any other cerithid in the area by its extremely slender shape. Young specimens will be distinguished from look-alike species of Bittium or Clathrofenella by the much more developed, protruding siphonal canal, surrounded by a rather concave area of the body whorl.
BIOLOGY / ECOLOGY
Egg masses are gelatinous strings attached to the bottom, from which the larvae hatch as planktotrophic veligers.
in its original range, the habitat is on muddy to sandy bottom from shallow water to ca. 60 m, mostly between 20-60 m. The Mediterranean habitat seems to be quite the same, on the continental shelf.