Mancinella armigera

These large drupes have thick, spindle shaped shells covered by blunt tubercles, the aperture is yellowish brown.^[3] But they are harmless to humans.^[4] The shell is biconic, spire projecting and massive with two rows of projecting noodles on the last whorl, white in color with a yellow aperture.^[5] The spire is projecting and acuminate, the suture is shallow.^[5] There are eight axial ribs with two rows of prominent tubercles encircling the last whorl and a single spiral of tubercles on the other whorls, as well as a spiral sculpture of fine striae.^[5] The aperture is ovate, the outer lips slightly thickened, with six denticles and a columella with a single absolute plait and a moderately developed siphonal fasciole.^[5] The shell is often covered with a thick calcareous deposit.^[5] The size of an adult shell varies between 50mm and 105.5mm. The shells are typically covered with a pink coralline algae.

This species is a non broadcast spawner. Life cycle does not include trochophore stage.^[4]

This species is distributed in the Indian Ocean along Chagos, the Aldabra Atoll and Tanzania; in the Pacific Ocean along Japan.

These gastropods occur at the outer edge of fringing reefs and subtitle lava shoulders exposed to heavy wave action.^[5] They are common along some exposed rocky coasts at depths of 10–40 ft^[3] and they often occur in pairs.

Collected for food by coastal populations.^[4]