Knefastia nigricans

Knefastia nigricans is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

Description

The slender, acute shell is blackish brown with the anterior part of the body whorl pale reddish brown. It has a conspicuous periostracum and a closely appressed suture separated by a single cord from the constricted anal fascicle. It contains nine whorls, without the protoconch. The axial sculpture consists of prominent angular ribs with wider interspaces, beginning abruptly at the shoulder rapidly dwindling anteriorly and obsolete on the base. These ribs are crossed by widely spaced slender cords, slightly nodulous at the intersections. The aperture is narrow. The anal sulcus is shallow. The outer lip is sharp, simple and with a slight subsutural callus. The inner lip is erased. The columella is straight. The siphonal canal is wide and very slightly recurved.