Striatoguraleus thetis is a species of sea snail, a marine gastropod mollusk in the family Horaiclavidae.

The shell shows fine spiral striae 6–7 on the first whorl, increasing to about.

The outer lip sinus is deep, with a thick, smooth parietal callus in the adult.

The straight columella is reflected at the short and broad siphonal canal.

[2] This marine species occurs off Jeffrey's Bay - Northeast Cape, South Africa