Cranopsis nymphalis: Diagnosis. Apex curved downwards, located close to apertural level. Height 47% of length; width ca. 80% of length. Sculpted by ca. 40 strong radial ribs, relatively narrow, profile rounded, bearing transverse low scales extending to narrow interspaces of ribs. Fissure flanked by low, thread-like edges; located close to anterior edge, not completely separated from edge.
Description. Shell size up to 10 mm, low, limpet-like; height 47% of length. Pure white. Protoconch of 1.5 rounded whorls; situated to right at posterior edge of apex smooth, glossy; size 250 p.m. Foramen cuneiform (pointed anteriorly), width ca. 12% of length; located anteriorly, barely open (possibly juveniles); 7% of shell width, 42% of shell length; edges irregular . Profile with beak curved ventrally, located on posterior edge (in dorsal view) ; teleoconch of one whorl; profile highly curved ventrally, sagittal profile as ark (center in middle level of dorsal surface, ca. 10% ventrally off aperture). Sculpture of ca. 40 regular primary radial ribs , with rounded profile; secondary ribs initially rather fine, gradually increasing to size of primary ribs at margin; transverse, semilunar, low nodes as thickenings at intersection with radial sculpture, disposed along ribs in regular spaces equivalent to ca. 1/2 of ribs' width; nodes continuing between ribs forming series of squared pits; interspaces between successive radial ribs ca. 1/3 their width; ca. 60 scales along ribs close to median line. Selenizone well-marked, as wide as fissure; edges barely taller than radial ribs, continuation from those of fissure, with sharp edges ; lunules well-spaced . Aperture planar elliptical in outline, width ca. 80% of length; edges undulating by radial sculpture. Inner surface smooth, glossy ; bearing several minute, radially aligned pits .Septum very small, ca. 5% of shell height; as long as wide, ventral edge slightly concave, ca. 8% of aperture width; transforming into simple projected posterior edge of fissure .
Measurements (in mm). Holotype: 7.2 by 5.0;

Cranopsis nymphalis: Type locality. Brazil. Espirito Santo; off Itaunas, continental slope of Abrolhos, 18°59'S 37°50'W, 295 m . Known only from type locality.
Habitat. Sandy mud bottoms, 295-940 m depth (dead specimens).