Shell very small (to 6.0 mm), fusiform, mostly translucent, of 6.5-7 convex whorls, the last comprises an average of 60% of total shell length. Protoconch 1,75-2 smooth regularly expanding translucent whorls, the first partially imbedded in the second, producing a blunt apex. Axial sculpture of strong ribs, 9-12 on penultimate, 8-12 on last to varix, curved, running suture-to-suture, sigmoid on base and evanesce at anterior fasciole; round in axial profile with no change in sulcal area. Rib crests ridged in cross section. Very fine growth striae present over entire shell. Varix positioned behind anal sinus, cup-handle-like. Spiral sculpture limited to a few (1-5) spaced spiral threads on base, and indistinct ridges on anterior fasciole. Anal sinus moderately deep, wide, edges slightly divergent; set off a short distance from the suture. Sulcus indistinct; ribs little changed. Outer lip thin, jutting outward from the base of the varix, without strengthening ribs; edge forms a low arc from and congruent with the anal sinus to the anterior canal; stromboid notch not seen in examined specimens. Inner lip erect on canal, thin and unemarginate, or only faintly so on parietal wall, a low callus present at suture. Anterior canal long for the genus, straight, unnotched; anterior fasciole not swollen. Color a uniform light golden brown, protoconch and aperture lighter.

Cerodrillia minima has all the characteristics that define the genus: ribs that extend from suture-to-suture with little change in the sulcal area, a cup-handle-like varix behind the anal sinus, 1/4-turn from the edge of the lip, an anal sinus spout-like, and spiral microsculpture restricted to the shell base. It is unique for the relatively long anterior canal and its small size. Variability. The 19 examined shells have an average length of 5.48 mm (4.5-6.0 mm); their average W/L ratio average is 0.436. Identification. Cerodrillia minima is not easily confused with its congeners; however, its small size, color, and habitat are similar to Syntomodrillia triangulos, new species, and Syntomodrillia mellea, new species. These latter species differ in possessing ribs that "sag" such that the whorl peripheries are below mid-whorl, their varix is not cup-handle-like and is located further away from the edge of the outer lip, and in possessing a narrower aperture with a spout-like anal sinus.

Mexico (Outer Campeche Bank: SW of Areas Cays; SW of Triangulos Reefs; NW of Arenas Cay). Reported from on mud at 77-108 m.