Acremodontina aff. carinata ( Powell, 1940 )

Herbert, David G., 2015, An annotated catalogue and bibliography of the taxonomy, synonymy and distribution of the Recent Vetigastropoda of South Africa (Mollusca), Zootaxa 4049 (1), pp. 1-98 : 84

Acremodontina aff. carinata ( Powell, 1940) —new record

( Figure 9 J, K)

Conjectura carinata Powell, 1940: 223 , pl. 28, fig. 8. Powell, 1979: 74, pl. 20, fig. 22. B.A. Marshall, 1995b: 102, figs 20–22, 29, 30, 56–59. Type loc.: between Spirits Bay and Three Kings Islands, northern New Zealand, 91 m; holotype in Auckland Institute and Museum (72052).

Distribution. Local material known only from off Mbashe River, E. Cape, 200–220 m, sponge dominated substratum, living.

Notes. This material probably represents an undescribed species, but one that is similar to A. carinata and other strongly carinate Acremodontina species ( Marshall 1995b). The highly glossy shell and flattened apex with somewhat sunken protoconch are typical of the genus. There is also a strong varix on the first quarter teleoconch whorl ( Fig. 9 K) and the radula exhibits the very unusual features typical of Acremodontina including short, scalelike central and lateral teeth, and slender, terminally branched marginal teeth (Herbert unpubl. obs.). This is the first record of the genus outside the Australasian region.

Figures

FIGURE 9. A – C, Homalopoma africanum (Bartsch, 1915), Aliwal Shoal, KwaZulu-Natal, ± 20 m, diameter 1.8 mm (NMSA S 7905). D – F, Homalopoma rotundatum (G. B. Sowerby (III), 1892), Still Bay, W. Cape, diameter 2.3 mm (NMSA A 3071). G, H, Conjectura agulhasensis (Thiele, 1925), SSE of Knysna, W. Cape, 101 m, diameter 2.2 mm (NMSA V 1792). I, Crosseola foveolata (Barnard, 1963), SSE of Knysna, W. Cape, 101 m, diameter 2.3 mm (NMSA V 1793). J, K, Acremodontina aff. carinata (Powell, 1940), off Mbashe River, E. Cape, 200 – 220 m, length 2.13 mm, scale bar for protoconch = 100 Μm (NMSA V 908). [Images not to scale.]