Shell large, depressed haliotiform with a small spire tightly appressed to the posterior right side of the shell. The larval shell consists of about half a whorl with a maximum diameter of 325-350 µm. The teleoconch consists of about 1.25, gradually more rapidly expanding, tightly appressed whorls. The columella forms a distinct shelflike, short septum. The external surface of the shell has 12-14, spirally arranged and evenly distributed, narrow crests consisting of a single row of conical protrusions, in some specimens connected via a pore to the interior of the shell. The pores become abruptly broader just below the outermost layer of the shell and the inner part has a diameter of about 30-70 µm. Usually they start appearing after about 0.5 teleoconch whorl. Between the pores, the external surface is covered by fine spiral lines formed by rows of much smaller granulae, also with a fine pore opening at the top. Scattered on the shell but more crowded around the large tubercles are tubular, hollow appendages of organic material, with a finely granular, greyish white surface. In addition to the large pores, the internal surface has much smaller ones (diameter 2-3 µm), common around the macropores , scarcer away from them. The periostracum is thin and colourless. Dimensions. Maximum length 10.3 mm, breadth 8.3 mm, height 4.2 mm; holotype length 9.0 mm. Stomach contents. Four specimens contained a uniform mass mainly consisting of powdered sulphur (EDAX analyses), mixed with mucus and scattered mineral particles.