Comprehensive Description

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General Description

The shell has a medium size for the genus (height up to 12.5 mm, width up to 13.4 mm), and is cyrtoconoidal in shape. The spire is moderately high, with a height about 0.9 times the width and 2.0−2.4 times the aperture height. The umbilicus is narrow and deep. The protoconch is about 550 um wide, having about 1 whorl, and is smooth, with a thin terminal varix. The teleoconch has up to almost 5 convex whorls, that bear spiral cords. The adapical cords are granular, and the abapical cords are smooth. The suture is visible, and is impressed, but not channelled. The first whorl of the teleoconch is convex, and is sculptured by 6 smooth, weak, low, very close, and similar in size and shape primary cords (from P2 to P7). There are also weak irregular growth lines. On the second whorl, the cords become stronger except P2, which is still weak. P1 appears under the suture, and is smooth. The interval between the cords is about half the width of the cords. On the third whorl, secondary chord (S) 1 appears, and is weak, and weakly granular. The cords are evenly spaced, with the distance between the cords similar in size to the cords. The area between the cords is concave, with prosocline thin growth lines. On the last whorls, S1 is clearly granular, with axially elongated beads. P2 becomes weakly granular, and has horizontally elongated beads. The other cords are smooth. The distance between the cords is about 1.5 times the width of the cords. P8 emerges from the suture only on the last whorl, close to P7. S2 sometimes appears at the end of the last whorl, and is thin and subgranular. The aperture is oval. The interior of the outer lip has thin lirae that correspond to the external cords. The inner lip is weakly curved, and projects over the umbilicus. The columella is straight, slightly oblique, and is without a tooth. The base is nearly flat or very weakly convex, with 20 to 25 smooth spiral cords. The three innermost chords are broader than the others. The interspace between the cords is smaller than the cords, and is smooth or with very weak axial threads. The umbilicus is narrow and funnel shaped, having a diameter about 10% of the shell diameter in the largest specimens, with crowded axial lamellae and no spiral cord within. The colour of the protoconch and teleoconch is an iridescent grey, with the last whorl being lighter and the base a whitish grey. The operculum is horny and multispiral with a short growing edge. The radula is rhipidoglossate, with an approximate formula of 20 + (1) + 6 + 1 + 6 + (1) + ~20. The rachidian and lateral teeth are similar in size and shape, with a large, oval base and serrated overhanging cusps. A lateromarginal plate is present. The marginal teeth are thin, and have a long shaft with serrated cutting edges.

(Vilvens & Sellanes, 2006)


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