Chevallieria columen
Chevallieria columen is a species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Iravadiidae.
Description
The length of the shell attains 4 mm, its diameter 1.3 mm.The shell is cylindrical, milky-white, and delicate, by no means shining. It possesses six whorls; the two apical ones are flattened at the apex itself, almost immersed, while the others are impressed at the sutures and appear stepped. The body whorl is almost straight and cylindrical. The aperture is ovate; the peristome is continuous, thickened, white, and expanded. The columella is oblique.