Type locality: Off Port Louis, Grande Terre, Guadeloupe. Description Shell small, elongate-fusiform (W/H 0.33, A/H 0.53), with long, stout siphonal canal. Protoconch high cyrtoconoid, of ~3.5 smooth glossy whorls, with gently convex profile. Protoconch-teleoconch transition clear-cut. Teleoconch of 6 whorls, suture shallowly impressed. Spire whorls subcylindrical, with sharp shoulder in first two whorls, and becoming progressively more rounded on later whorls. Last adult whorl indistinctly shouldered, with evenly convex outline. Axial sculpture of low orthocline ribs (31 and 23 on last and penultimate whorls, respectively), triangular in cross-section, with equally broad interspaces. Ribs intersected with broad flattened cords of even width, separated by narrower wavy grooves resulting in characteristic beaded pattern on last two whorls, extending to shell base and larger portion of siphonal canal. Pemultimate whorl with 7 cords, last whorl with 13 cords, followed by 7 oblique cords on siphonal canal. Canal long, straight, tapering, without sharp demarcation from shell base Aperture narrow, elongated, with distinct parietal callous pad. Outer lip thin, with undulating margin bearing 10 fine lire deep within aperture. Inner lip with four rather broadly interspaced columellar folds, adapicalmost strongest. Shell uniformly pale, aperture cream-white. Radula (holotype) of ~40 transversal rows. Rachidian broad, bow-shaped, with six subequal, pointed cusps; marginals simple, sickle-shaped with single cusp. Etymology The species epithet refers to the successful 2015 expedition Karubenthos 2 (in French commonly referred to by the expedition team as Karu deux), which uncovered many still undescribed species of bathyal Caribbean fauna, including the present species. Distribution Known only from type locality. 45 Remarks Remarkably, the most resembling species to C. karudeux sp. nov. is the phylogenetically unrelated Nodicostellaria laterculata. The latter is highly polymorphic, and deeper water specimens (e.g. MNHN-IM-2013-60616) are extremely similar to C. karuder, the only differences being the lack of a parietal callous pad, the dark brown protoconch, and the presence of the distinctive color pattern of beige and brown in N. laterculata. C. karudeux sp. nov. is also superficially similar to C. styria; however, it can be differentiated by the proportionally lower spire and broader spiral cords, which are clearly broader than the grooves separating them in C. karudeux sp. nov., but are of about equal width as the interspaces in C. styria. C. karudeux sp. nov. has much resemblance to the two closely related new species described below. C. fabergei sp. nov. and C. macrocephala sp. nov.; for differences, see the remarks section under the latter two species.