Filodrillia columnaria
Filodrillia columnaria is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae. Description. (Original description) The shell has a slender elongate-fusiform shape. Its colour is buff, with a pale peripheral zone underlined by an orange band. It contains seven and a half whorls, of which two constitute the protoconch, angled at the shoulder, flattened above and rounded beneath, excavate at the base. The sculpture :—No radials occur. The fasciole area is traversed by three or four fine close threads. The rest of the shell carries stronger cords, uniform in size and evenly spaced . Of these there are seven on the penultimate and twenty-two on the body whorl. The aperture is open, right insertion ascending above the plane of the suture. A slight varix can be seen behind the aperture. The outer edge of the expanded lip is denticulate by the spiral sculpture. The inner lip shows a thin sheet of callus. The sinus is deep, spout shaped. The siphonal canal is short and open. Distribution. This marine species is endemic to Australia and occurs off Tasmania.