Asperdaphne balcombensis
Asperdaphne balcombensis is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
Description
The length of the shell attains 11 mm, its diameter 4.25 mm.The fusiform shell is characterized by convex whorls, an excavated base, and a moderately long, flexed, and recurved anterior siphonal canal. Its most distinctive feature is the sculpture of numerous sharply raised, rounded axial ribs crossed by crisp primary and secondary spiral cords.
The protoconch consists of 2 1/2 rounded whorls that are finely striated. The apex is small and inrolled. The body whorl bears a few weak, irregular axial riblets and is terminated by a thin, sinuous rim.
The whorls of the teleoconch are convex with a slight shoulder, located at approximately four-fifths of the whorl height.
The anterior canal of the aperture is moderately long, flexed, and recurved.
The sculpture of the shoulder area contains 5 to 6 fine spiral lirations crossed by arcuate threads that follow the curve of the sinus. The axial sculpture consists of Numerous, sharply raised ribs and rounded axial ribs are present. They originate at the shoulder angle and run over the base, extending to the anterior end. There are 20 axial ribs per whorl. The axial ribs are crossed by crisp, narrow primary spiral cords.
The penultimate whorl bears 6 primary cords, with a finer secondary thread in each interspace. The body whorl bears approximately 16 primary cords. The siphonal canal bears 6 strong spiral cords, but no axial sculpture.
The outer lip is thin. The sutural sinus is typical for the genus and is a reversed "T-shaped" but is not deep.