Aulopoma is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Cyclophoridae. They are endemic to Sri Lanka.
Four species are recognized.
(Original description in German) The operculum perfectly resembles the shell of a Planorbis; it consists of many slowly widening whorls that enclose an internal spiral cavity. On the body whorl a circular groove runs inward, which receives the simple peristome (lip) of the shell. Consequently, the edge of the operculum overlaps the margin of the shell aperture like the lid of a jar. The simple peristome does not lean against the previous whorl â a necessary feature to allow the operculum to overlap â which provides a means of distinguishing this genus from other cyclostomids even in the absence of the operculum.
The shell of the single species upon which I establish this interesting genus was collected in Ceylon by my unfortunate friend Dr. Hofmeister, who sadly passed away during his travels. In memory of its discoverer, I name it A. hofmeisteri. It is flat, almost disc-shaped, with a slightly projecting, very pointed spire, deeply impressed sutures, and a wide umbilicus. It is yellowish in color with brown bands and markings. Its diameter is 8 mm.
(Description in German by Kobelt) The shell is low-turbinate to disc-shaped, with the body whorl detached at the front. The peristome (apertural margin) is free, straight, and continuous, fitting into a circular groove on the operculum. The operculum itself is not calcified and is slightly larger than the aperture; it is tightly coiled, planorbiform, and composed of two lamellae. Between these lamellae lies a spiral canal, while the outer edge features a groove designed to receive the peristome.