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

This species was first named as Tryblidium radiatum and described from Silurian in crystalline limestone of Wialmsudd near Fårösund in Sweden by Gustaf Lindström in 1884.

The greatest height is lying near the middle of the longitudinal axis.

The surface is covered by fine, closely packed, radiating striae and a few concentric lines of growth.

[1] This article incorporates public domain text from reference.