Protoconch of 1½ -1¾ smooth whorls, with sharp-edged transition to teleoconch. Spire weakly convex in outline, whorls evenly convex, aperture 1/3 shell length. Whorls sculptured with spiral cords, 8-11 on penultimate whorl and 20-30 on body whorl. Axial sculpture absent. Outer lip sinuous in profile, thickened externally, with sinus posteriorly; usually smooth internally, but with 2-3 weak elongate denticles centrally in very mature shells. Columella smooth; weak denticle on parietal wall. Siphonal notch narrow, deep, sometimes extending into a short siphonal canal. Colour fawn, cream or tan, often with diffuse brown flames descending from suture.
Size: Up to 11 mm in length.

Aesopus filosus: Shell elongately fusiform, pale fulvous or brown, with spots of darker brown and white below the sutures; spire acuminately turreted, apex a little obtuse ; whorls eight, slightly convex, transversely finely sulcated throughout, last whorl nearly one-third the length of the shell; aperture moderate, ovate ; columella arched ; outer lip slightly thickened externally and denticulated within. Length 5,25 lines, breadth 2 lines.
Australia. New South Wales. Dredged in Port Jackson in 5 fathoms

Distribution: Endemic to Australia; Capricorn Channel, Queensland, southwards to Maria Island, eastern Tasmania.
Habitat: Subtidal, down to 188 m. Occasionally found as a beach shells. Common.