Niahia oberon Vermeulen, 1996  

Vermeulen (1996) original descriptions on Niahia oberon – “Shell white, dextral, shortly cylindrical, last two whorls widest. Whorls 4 ½, moderately convex. Constriction without teeth. Tuba ¼ whorl. Radial ribs single-crested, on the top whorls and on the penultimate whorl 36 ribs/0.5 mm, on the last whorl 12 ribs/0.5 mm, ribs absent above the aperture, but present again on most of the tuba. Spiral striation absent. Umbilicus seemingly closed but rimate in oblique view. Aperture tilted about 45° with regard to the coiling axis, about ovate. Peristome: palatal side slightly protruding beyond the penultimate whorl, columellar side not sinuous; outer peristome a very narrow rim not spreading beyond the inner, mainly present on the basal and the columellar sides, inner peristome protruding from the outer, abruptly widened at the level where the outer is attached to the shell wall, an spreading at the margin but without a lip on the palatal and basal side, its outer surface with few fine lamellae.”