TYPE MATERIAL Holotype (MNHN-IM-2000-34803) dim. 3.15 × 0.95 mm. Protoconch 0.38 0.23 mm. stn GD27. Paratype 1 (MNHN-IM-2000-34804) dim. 3.30 x 1.00 mm. Protoconch 0.35 0.20 mm. stn GB21. Paratype 2 (MNHN-IM-2000-34805) dim. 2.53 x 0.92 mm. Protoconch 0.35 0.21 mm. stn AM042. Paratype 3 (MNHN-IM-2000-34806) dim. 2.35 x 0.77 mm. Protoconch 0.45 0.23 mm. stn AM042. Paratype 4 (MNHN-IM-2000-34807) dim. 2.40 x 0.75 mm. Protoconch 0.35 0.21 mm. stn AM043. Paratype 5 (MNHN-IM-2000-34808) dim. 2.30 x 0.75 mm. Protoconch 0.42 x 0.22 mm. stn AB358.

TYPE LOCALITY Caribbean: Guadeloupe, Port-Louis, 120 m. DISTRIBUTION Guadeloupe, Martinique.

DESCRIPTION Shell medium in size, sub-cylindrical, slightly constricted at the base and with moderately impressed sutures. Protoconch conical of about 4.5 smooth convex whorls; color pale yellowish, transparent. Teleoconch of 7 whorls with reticulate sculpture of 3 equal spiral cords crossed by axial ribs, about 20 on last whorl; beads at each intersection. A fourth beaded cord is emerging at the base of the last whorl from the insertion of the outer lip; border between columella and base highlighted by a weak cord. Columella short and broad, obliquely truncated, with the surface crossed by thin crisp threads, columellar callus bordering a circular aperture; anal sulcus and siphonal canal well defined. Background color yel- lowish with suture and 1st spiral cord pale brown, beads paler.

COMPARISON Cerithiopsis boutrini n. sp. can be confused with Cerithiopsis albovittata (C. B. Adamas, 1850) and Cerithiopsis barthelati n. sp. due to their similar color: the most obvious difference is its subcylindrical form.

ETYMOLOGY Named after Louis Boutrin, councilor with the Collectivité Territoriale de Martinique, in charge of sus- tainable development, for his understanding and support to the MADIBENTHOS expedition.