Sabatieria fidelis sp. n. (Figures 5, 6, 7, 8; Table 1) Material Studied: 2 males, 2 females. Type material: Male holotype, slide MNRJ 320. Female paratype, slide MNRJ 321; 1 male, slide 96 NM LMZOO-UFPE, 1 female, slide 97 NM LMZOO-UFPE. Type locality: Male holotype, station no. 54, 750 m depth, collected in May 2002. Other localities: Female paratype, station no. 41, 1222 m depth, collected in May 2002; male paratype, station no. 35, 916 m depth, collected in May 2002; female paratype, station no. 74, 750 m depth, collected in November 2002 (cf. Appendix 1). Etymology. The species name is the Latin fidelis = faithful, because the specimens have all the characteristics that are common to Sabatieria species, and the new features are not easy to see. Description. holotype: Cylindrical body, medium-sized, attenuated at both ends. Cuticle with transverse rows of dots, and lateral differentiation with larger and more widely spaced dots, irregularly arranged. Head slightly set off by constriction in the cephalic setae region, and with anterior sensilla arranged in three crowns: six minute internal labial papillae, six external labial papillae and four cephalic setae. Buccal cavity cupshaped. Amphidial fovea spiral, with 2 1 / 4 turns. Pharynx slightly clavate, gradually expanding towards the posterior end, but without distinct bulb. Cardia short and round. Nerve ring slender, located very close to middle of pharynx and anterior to secretory-excretory pore. Cellular body of ventral gland at level of posterior end of pharynx and beginning of intestine, with secretory pore in middle of pharynx. Male reproductive system diorchic, with opposed and outstretched testes. Anterior testis situated on the left and posterior testis on the right side of the intestine. Slender short paired spicules, similar in length and width and slightly curved ventrally; proximal half of septum and distal part with ventrally directed dropper-shaped tip. Several glandular cells are arranged around the spicules. Gubernaculum small, cuticularized, ...