“Genus Sinuber n.g.
Type : Natica sculpta Martens
The above new genus is provided for small Sinum-like species, the true relationship of which is probably with Polinices rather than with Sinum. The shell is thin, white, with a very inconspicuous epidermis, a transparent, almost colourless film ; protoconch smooth and glossy, or with faint spiral lines; post-nuclear sculpture of deeply incised linear grooves; umbilicus narrow and partly bridged, not infilled, by a reflexed columellar callus; columella almost vertical; operculum paucispiral and horny.
The radula is of a style common in the family and similar to that of Polinices and Amauropsis. Minor differences are that the side cusps of the central tooth are relatively small, the laterals are deeply sinused on their inner edge and bear three weak cusps, while the marginals have simple arcuately pointed, not bifid cusps. It was shown by Troschel (1861, pl. 15, figs. 15, 16) and by Iredale (1924, p. 256) that true Sinum has a broad central tooth with the two side cusps more prominent than the central one. The Sinum-like genera of Polinices affinity—i.e. Sigaretotrema Sacco, 1890 ( =Propesinum Iredale 1924) and Eunaticina Fischer, 1885—are not applicable either, for Iredale pointed out (loc. cit.) that their tendency is for the central to become unicuspid.”
(Powell, 1951: 120)
Species within the genus Sinuber include: