Nodopomatias oakesi (Godwin-Austen, 1917)

Fig. 8 E

Eupomatias oakesi Godwin-Austen, 1917: p. 580, Figs 5 d, 6b. Nodopomatias oakesi — Gude 1921: p. 161.

Diagnosis. A medium sized, tumid species with very weak peristome margin and a basal keel situated close to the umbilicus.

Description. Shell light brownish-yellowish; turriform, widest at its base; the 7.25–7.5 rather flat whorls (n=3) are separated by shallow suture; the boundary of the protoconch was not visible on the three specimens examined because of corrosion; approx. the first whorl of the protoconch seemed to be smooth, glossy, the second whorl is extremely finely ribbed; ribs are regular on the whole shell, even behind the aperture; basal keel with blunt ribs; keel starts behind the aperture (a bit left from the lowermost point) and ends behind the columellar-basal meeting point of the aperture; aperture rounded with slight upper incision (parietal-palatal transition); parietal-columellar transition is not angled; apertural rim slightly thickened and not, or very slightly reflexed; it consists of two circles, a wider outer and a very thin inner; the boundary between these visible only from apertural view, from lateral view the aperture seems to be simple.

Measurements (in mm). H: 11.0, D: 3.8 (n=1).

Differential diagnosis. Nodopomatias oakesi is much smaller than N. sibbumensis, has a more corpulent shell and weaker basal keel.

Type material. Abor Hills, leg. Oakes, Godwin-Austin Collection, NHMUK 1903.7.1.3086. (3 syntypes).

Distribution. Nodopomatias oakesi is known from the type locality only (see also Fig. 2 and Table 3).