Holotype: Shell moderately large for the genus; surface dull white, with a reddish brown band in the subsutural area and below the periphery, back of last whorl uniformly brown; length of aperture plus canal more than 1/3 the length of the shell; suture impressed, whorls rounded, subsutural area concave. Protoconch of 2,5 smooth whorls with a small central tip, first postnuclear whorl carinate and nodulous with the emergent axial ribs; postnuclear whorls 10. Axial ribs 10 on early whorls, increasing to 22 on the penultimate whorl, subdued in the subsutural area, flexed across the body whorl and obsolete upon the base; back of last whorl with a massive thickening 1/2 turn back, axial sculpture obsolete upon back of last whorl; spiral sculpture of numerous striae, slightly irregular in spacing, overriding the axial ribs and more pronounced upon the pillar. Sinus deep, U-shaped, bordered on the inside by curved parietal callus, lip slightly thickened away from the edge, at an angle to the moderately long, deeply notched anterior canal, inner lip slightly raised above the pillar. Height, 19.0, diameter, 7.2 mm.

Agladrillia flucticultis has more numerous axial ribs than the other species and a distinctive color pattern. It could only be confused with A. pudica (Hinds, 1843), a uniformly white species in which the back of the last whorl is dark reddish brown. The name is a Latin noun, meaning little wave, suggested by the fine, wavy axial ribbing.

Pacific Tropical America. Type Locality: Gulf of Tehuantepec, off Puerto Madero, Chiapas, Mexico.