Description: Shell orbicular depressed, nearly lenticular, rather solid, with a rounded periphery scarcely angulated. Protoconch of about 1,5 smooth whorls, of about 360 µm in diameter. Teleoconch of about 1 – 1,25 whorls, increasing not very rapidly; dorsal sculpture formed by one spiral cord which forms a slight angulation. There are numerous strong proxocline poorly delimited axial ribs. Ventrally, there are two spiral cords, the lowest one delimiting the umbilical infundibulum. The other one, similar in size, is placed between the first and the rounded periphery. The axial sculpture is formed by irregular prosocline ribs narrower than interspacies. The whole shell surface examined under magnification presents a rough surface with spiral sculpture but no microtubercles could be seen. The umbilicus is deep, wide and limited by a spiral cord. Aperture rounded, columella curved, nearly vertical, the upper part of the outer lip sharp. Dimensions: The holotype is 1.0 mm in maximum dimension (diameter).
Etymology: The species is named for Anselmo Penas, malacologist of Vilanova i la Geltru, student of the micromolluscs, who found the type material in sediments collected by the authors.

The species was described in spite of the scarcity of the material collected because is very different from any other known species.
The most similar could be T garrawayi, but this latter species is larger, the periphery more keeled, the miscrosculpture formed by aligned rows of tubercles and the protoconch has 1,75 whorls, with slowly increasing diameter and a rib at its end.
In lateral view, it can have some similarity with Discopsis militare , but this latter species is larger, the axial sculpture is minute, and the protoconch has 2 whorls and larger diameter.

Distribution: The scarce material studied came only from Mauritania. Type locality: Banc d'Arguin, Mauritania.