In this species, the first stage is a small, high, conical trochospire consisting of about 2 whorls, flattening out toward the periphery, with a subcircular outline. It is shallow-concave on the umbilical side, with a deep axial depression. The following chambers that make up the flattened second ontogenetic stage are crescent with secondary septa. They become increasingly elongated and are added irregularly, resulting in an unevenly lobed outline of the test. There is no peripheral flange. The spirally elongate-crescent chambers appear as symmetric, petal-shaped, on the umbilical side. The walls are made up of typically “rounded-rectangular” truncated spicules that are scattered. The first chambers are dark brown to blackish while the remaining ones are yellowish or white.
The wall is made up of typically “rounded-rectangular” truncated spicules arranged irregularly. The test begins with a very low-convex trochospiral stage of about 10 chambers, arranged in 2 coils, with oblique sutures. In this stage chambers increase slowly in size. Chambers of the second stage become rapidly elongate-crescent. They are added irregularly and the last ones may have lengths of about one third of the circumference of the chambered test. They are subdivided by secondary septa. The last stage is represented by an irregularly contoured flange, containing randomly dispersed spicules embedded within fine agglutinated particles. The first stage and part of the second stage of the test are dark brown in color. The end of the second stage and the flange are yellowish or white.