Amnicola dalli

The shell is narrowly umbilicate, obtusely conical, and lustrous with a smooth surface and a light brown or greenish-horn coloration.

It exhibits 4 convex whorls that gradually increase in size, separated by a regularly impressed, moderately deep suture.

The aperture is rounded anteriorly and somewhat angular posteriorly, with a bluish-white interior.

The outer lip is simple, sharp, and connected by a thickened callus.

The type locality is mountain streams which are tributary to Pyramid Lake in northwestern Nevada.

Drawing of the radula of Amnicola dalli .