Sinutropis

Sinutropis is a genus of fossil sea snails, extinct euomphalid archaeogastropods from the Upper Silurian.

Description
The shell has rounded whorls and a deep rounded sinus on the upper lip of the aperture in place of the typical exhalent angulation of most related genera. Otherwise the shell is not obviously ornamented.

Species
According to the Paleobiology Database, the following species are included in this genus:
 * Sinutropis esthetica Perner, 1903
 * Sinutropis interrumpens Perner, 1903
 * Sinutropis spiralis Rohr, 1988
 * Sinutropis tenera Perner, 1903