Helcionopsis striata is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae.

The shell is rather strongly convex, acuminate-ovate in outline, broadly and regularly rounded behind, pointed in front where the apex projects slightly beyond the margin of the aperture.

The surface is marked by distinct, rounded, radiating lines, which in the outer half maintain an approximately equal size through bifurcation.

[1] This species is closely related to the Upper Silurian Helcionopsis radiatum, which is a little more convex, the anterior outline blunter and the apex more incurved.

[1] It is rare in the upper beds of the Cincinnati formation, Marion County, Kentucky.