Diagnosis: Conical-turbinate, body whorl weakly widened, shell with raised appearance. Suture reentrant, forming channel. Platform below the suture forming nodules, with 3-5 fine spiral threads. Shoulder with thinner tubercles or smooth appearance. Region below the shoulder with 2 spiral cords. Peripheral cord nodular, with the subperipheral area adorned by 2 fine spiral cords. Basal cord smooth. Circumbilical cord weakly tuberculate. Umbilicus narrow.
Description: Shell conical-turbinate, 6 mm x 5.9 mm, angular contour, without nacre, base lightcolored with tan streaks and spots, 5 ¾ whorls, shouldered. Protoconch small and smooth, about one whorl. 1st whorl with 3 spiral cords and the presence of the shoulder below the suture. 2nd whorl and subsequent whorls a bit more reticulated, 4 spiral cords making up the shoulder. Body whorl ample and broad. Suture reentrant, forming a channel in whorls 3 and 4, between the smooth abapical cord and the cord below the strongly nodular suture. The abapical cord forms the peripheral cord on the body whorl. Platform below the suture strongly ribbed, forming adapical nodules and the lower part crossed by 3 to 5 fine spiral threads. The axial ornament isalways stronger in this region. Shoulder weakly forming tubercles that are weaker than those below the suture or has a smoother appearance, however no specimen has a secondary cord that is stronger than the shoulder. Region between the shoulder and the peripheral cord with the presence of 2 spiral cords of the same appearance, which can vary from fine to broad, in the latter case sub-equal to the shoulder and the peripheral cord. Platform with 2 spiral cords. Between these sub-shoulder secondary spiral cords there are microscopic spiral threads.
Peripheral cord weakly nodular or smooth, but in both cases similar to the shoulder. Region below the peripheral cord with 2 sub-equal fine spiral cords. Base broad, slightly convex and ornamented by 10-12 spiral cords, the two innermost of which a bit more weakly tuberculate. Circumbilical cord weakly tuberculate, bordered by a small spiral groove. Intraumbilical region ornamented by 8-12 fine spiral threads intercalated by a fold that is a bit more reinforced. Umbilicus very narrow, corresponding to 11% of the maximum width; funnel-shaped and very sharp. Peristome strong. Inner lip concave, with a final reinforcement on the collumella due to the termination of the circumbilical cord. Aperture sub-circular with posterior thinning. Outer lip fine. Axial streaks on the platform below the suture and in the region between the shoulder and the peripheral cord.

Among the Solariella described thus far for the Atlantic, Solariella quinni sp n. presents greater affinities with Solariella cristata Quinn, 1992, p. 52, fig. 7-8, which present a solid conical-turbinate shell, are deeply umbilicated, with a narrow umbilicus, tan streaks, base weakly convex and developed spiral ornaments on the body whorl; but are easily distinguished as S. quinni has 3 spiral cords on the 1st whorl (4-5 spiral cords in S. cristata), a ample, broad body whorl adorned by 4 primary spiral cords, 3-5 secondary spiral cords below the suture, 2 weaker spiral cords below the shoulder and 2 weak cords below the peripheral cord; a total of 11-13 irregular spiral cords on the body whorl (there are 14 subequal spiral cords in S. cristata); the 2nd whorl is reticulated, form by 4 spiral cords crossed by axial ribs; the base is ample, slightly convex, with 10-12 spiral cords, the 2 innermost being weaker. In S. cristata, the base is equally convex, but composed of 7-10 spiral cords. S. quinni also presents a weakly nodular circumbilical cord, separated from the other basal cords by a deep spiral groove. The umbilicus is narrow in both species, with 8-12 spiral threads and a strong upper fold in S. quinni, and 4-6 nodular spiral cords in S. cristata. The width of the umbilicus ranges from 30 % of the maximum width in S. cristata to 11 % in S. quinni. Despite the occurrence of particular affinities of these species with S. carvalhoi and S. quadricincta, there are very profound differences, which basically regard the presence of very developed spiral ornaments in S. quinni.

Pernambuco, Brazil