Oxystele impervia (Menke, 1843)

Trochus impervius Menke, 1843: 18 . Philippi, 1844 in 1842–1845: 139, pl. 4, fig. 5. Philippi, 1851 in 1846–1855: 145, pl. 24, fig. 8. Type loc.: West coast of Australia [erroneous], Cape of Good Hope also mentioned; neotype in SAMC (A37548), designated by Heller & Dempster (1991: 399, pl. 1a, b); neotype loc.: Dalebrook, Cape Peninsula, False Bay, South Africa.

Trochus (Oxystele) impervius — Krauss, 1848: 96 (in part, includes O. antoni).

Monodonta (Oxystele) impervia — Troschel, 1879: 231, pl. 23, fig. 3 ( radula).

Oxystele impervia — E.A. Smith, 1906: 55. Barnard, 1913: 80, text fig. Heller & Dempster, 1991: 399, pl. 1a–l, pl. 2a, c (further references). Branch et al., 2010: 176, fig. 77.4. Van der Bank et al., 2013.

Oxystele sagittifera perdix (non Koch, 1851)— Turton, 1932: 182, pl. 44, no. 1280.

Oxystele carinata Turton, 1932: 183, pl. 44, no. 1282. Type loc.: Port Alfred, E. Cape; type material probably in OXUM, but verification required.

Oxystele farquhari Turton, 1932: 183, pl. 44, no. 1285. Type loc.: Port Alfred, E. Cape; type material probably in OXUM, but verification required

Oxystele variegata —Barnard, 1963: 268 (in part); Kilburn & Rippey, 1982: 42 (in part), pl. 9, fig. 4 (in part).

Diloma impervia —Steyn & Lussi, 1998: 24, fig. 78.

Distribution. Southern Transkei (Dwesa) to Namibia (Luderitz); intertidal.

Notes. Krauss (1848) recorded this species from the ‘ Natal coast’, indicating that some of the material he included under this name was probably referable to O. antoni (see above).