Asperdaphne exsculpta
Asperdaphne exsculpta is an extinct species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
Description
The length of the shell attains 3.9 mm, its diameter 2.15 mm.The shell is small and broad, characterized by angulate whorls that are deeply excavated at the sutures. The protoconch is papillate, consisting of 2½ whorls; the apex is protruding and peg-like. The entire protoconch surface is sculptured with 10 spiral lirations that abruptly terminate at the initiation of the first axial rib of the teleoconch sculpture. The axial ribs are heavy and rounded, numbering 10 per whorl, and are crossed by sharply raised spiral cords and accompanying interstitial threads. The spire whorls bear three primary spiral cords, while the body whorl possesses six primary cords; a single secondary thread is present in each interspace between these primary cords. Additionally, the concave shoulder area, just above the uppermost primary cord, bears one extra spiral thread, and the anterior end is sculptured with eight strong, closely spaced spiral cords. The sinus is sutural and moderately deep.