Sabatieria exilis sp. n. (Figures 2, 3, 4; Table 1) Material Studied: 4 males, 2 females, 2 juveniles. Type material: Male holotype, slide MNRJ 318. Female paratype, slide MNRJ 319; 3 male paratypes, slides 90–92 NM LMZOO-UFPE; 1 female paratype, slide 93 NM LMZOO-UFPE; 2 juvenile paratypes, slides 94–95 NM LMZOO-UFPE. Type locality: Station No. 49 at 750 m depth in silt-clay sediments collected in June 2003. The type station was in the Campos Basin off Rio de Janeiro, Brazil, in silt-clay sediments (see Appendix 1). Etymology. The Latin name exilis = slender, refers to the narrow maximum width of this species. Description. holotype: Body cylindrical, medium-sized, attenuated at both ends. Cuticle with transverse rows of small dots, lateral differentiation of larger, equally spaced dots. Short somatic setae. Rounded head with anterior sensilla arranged in three crowns: six minute internal labial papillae, six minute external labial papillae and four cephalic setae. Amphidial fovea spiral, with 1.5 turns situated at level of cephalic setae. Buccal cavity minute. Pharynx clavate and gradually expanding in the last third, towards the posterior end but without distinct bulb; the anterior end surrounds the posterior part of stoma, which is weakly cuticularized. Cardia short, pear-shaped. Nerve ring slender, located somewhat anterior to middle of pharynx and anteriorly to secretory-excretory pore. Ventral gland present on posterior end of pharynx and beginning of intestine. Male reproductive system diorchic, with opposed and outstretched short testes. Anterior testis situated on the left, and the posterior testis on the right, side of the intestine. Slender cuticularized paired spicules of equal lengths and widths and slightly curved ventrally; proximal half with mid-septum and presence of alae. Several glandular cells are arranged around the spicules. Small gubernaculum with narrow cuticularized apophysis. Six minute pore-like pre-cloacal supplements, equally distributed; pre-cloacal setae present. Spermatozoa oval, ...