Halgyrineum louisae is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

[2] Sculpture of low, subequal spiral cords, as broad as the interspaces, with low and narrow axial ribs forming small knobs at their intersection with the cords.

[2] Varixes are situated along the broadest section of the shell, moderately thick, repeated after a little more than half a whorl so that they are slightly and regularly offset along the spire, overrun by the spirals.

[2] The aperture is oval; outer lip faintly fluted inside; parietal and columellar edge forming a continuous callus, the parietal edge with a small but well-marked denticle, the columella is faintly tuberculate.

[2] This article incorporates CC-BY-SA-3.0 text from the reference the World Register of Marine Species.