"Sinuber microstriatum n.sp. (Figs 241, 267, 277, 278)
MATERIAL EXAMINED: Eltanin Stns 410, 1871; USNM 612983, 72°14.3'S, 171°08.5"E, 390 m.
DISTRIBUTION: Known only from the Ross Sea (357-390 m) and from off the South Shetlands (220-240 m).
DESCRIPTION: Shell of medium size, but large for genus, elongate-ovate, fragile, with umbilical chink. Spire of medium height. Whorls four, including large protoconch Of 1 ½ smooth, flattened whorls, rapidly expanding, suture abutting. Sculpture on teleoconch of microscopic, irregular, rather wavy spiral striae, slightly more marked on shoulder. Epidermis very thin, pale brown. Aperture elongate-ovate, outer lip thin, inner lip spread in very thin glaze across parietal area. Columella slightly thickened, reflected so as to almost cover umbilicus, leaving only a narrow umbilical chink while leaving the narrow, open umbilicus obliquely visible. Operculum horny, large, dark brown, fragile.
Radula (Figs 267, 277, 278) with strongly tricuspid central tooth, and lateral teeth with one large cusp with single subsidiary cusp to each side of it. Most marginal teeth are simple in both radulae examined, although a few inner marginals are bifid.
DIMENSIONS: height 22.0 mm, diameter 18.0 mm (holotype); height 19.1 mm, diameter 16.8 mm (paratype); height 17.3 mm, diameter 14.7 mm (specimen from Eltanin Stn 410).
HOLOTYPE: from Eltanin Stn 1871 in National Museum of Natural History (USNM 860118).
PARATYPE: from Eltanin Stn 1871 (one, MF 49870) in National Museum of New Zealand.
REMARKS: The single specimen from Eltanin Stn 410 (off the South Shetlands) matches the three specimens from the Ross Sea in radular and shell characters, and there seems little doubt they should all be considered conspecific. The radulae of specimens from Eltanin Stns 410 and 1871 are very similar to that figured by Powell (195 1) for Sinuber sculptum scotianum. The sum of shell and radular characters seem to indicate Sinuber as the correct generic position for this new species. It seems quite close to Sinuber perscalptum (Martens, 1878) from Kerguelen Island except that the spire is considerably less acute and the umbilical chink is more open."
(Dell, 1990: 161-162)
Sinuber microstriatum is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.[1]
The maximum recorded shell length is 22 mm.[2]
Minimum recorded depth is 230 m.[2] Maximum recorded depth is 230 m.[2]
Sinuber microstriatum is a species of predatory sea snail, a marine gastropod mollusk in the family Naticidae, the moon snails.
