Rotellenzia lampra is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

It has a high concave spire, a sharp apex, an acute carina, an angulated umbilicus, and a rhomboidal aperture.

The aperture is a little oblique, rhomboidal, the basal and palatal lines being nearly parallel, while the outer and inner lip diverge downwards.

The outer lip is thin, not patulous, not descending, advancing at its junction with the body whorl, and then retreating so as to form a shallow, broad, open sinus a little below the suture, acutely, but roundedly, angulate at the periphery, nearly flat on the base, with a very slight nick at the point of the columella, where it joins the inner lip at a slightly obtuse angle.

Below this it is hollowed out by a receding curve, but advances again into a slight rounded projection just above its junction with the outer lip.

The umbilicus is oblique edged, funnel-shaped, being wide in the mouth and deep, with straight converging sides.