Anticlinura biconica

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Anticlinura biconica is a small sea snail in the Mangeliidae family. It was first described in 1913 and has also been listed as Surcula biconica.

Size and shape
- The shell reaches about 8.75 mm in length and 4.5 mm in diameter.
- It is thin, white, and has a biconical shape with a short siphonal canal.
- The shell has 8 whorls; about the first two form the protoconch (the initial whorls).

Shell details
- The early whorls: the first is smooth, the second is obliquely ribbed.
- The remaining whorls have a strong keel with depressed tubercles at the base of the excavation.
- There are narrow axial ribs (14 on the body whorl) and several remote spiral cords that cross the ribs and create bead-like markings.
- A few faint spiral cords appear on the siphonal canal.
- The suture is distinctly waved, giving the whorls an angular, excavated look.
- Growth lines are fine and more visible in the excavated areas.

Aperture and opening
- The aperture is oblong and angular above, with a short open siphonal canal below.
- The outer lip is thin and sometimes broken, with a shallow sinus above and a slightly extended edge.
- The columellar margin is nearly straight and has a thin layer of enamel.

Distribution
- This species is found in the Banda Sea, Indonesia.