Gradaterebra Cotton & Godfrey 1932

Genus Gradaterebra Cotton & Godfrey, 1932 (Fig. 10D) Type species: Gradaterebra scalariformis Cotton & Godfrey, 1932; OD. Diagnosis: Shell small (< 25 mm), often dull-coloured, with flattened tobulbouswhorls; axialsculptureof prominentribs; spiralsculpture absent, microscopic or represented by fine cords; last whorl inflated. Distribution: Indian and SW Pacific Oceans. Remarks. The genus mainly comprises small species from Australia and South Africa, which can be differentiated based on adult size < 25 mm. Included species: Gradaterebra scalariformis (Cotton & Godfrey, 1932) 4 n. comb.; G. assecla (Iredale, 1924) 4 n. comb.; G. capensis (E. A. Smith, 1873) 4 n. comb.; G. easmithi (Aubry, 1999) 4 n. comb.; G. kowiensis (Turton, 1932) 4 n. comb.; G. lightfooti (E. A. Smith, 1899) 4 n. comb.; G. ninfae (Campbell, 1961) 4 n. comb.; G. pilsbryi (Aubry, 1999) 4 n. comb.; G. planecosta (Barnard, 1958) 4 n. comb.; G. severa (Melvill, 1897) 4 n. comb.; G. sorrentense (Aubry, 1999) 4 n. comb.; G. taylori (Reeve, 1860) 4 n. comb.