Genus Sabatieria Rouville, 1903 Sabatieria curvispiculata sp. n. (Fig. 1, Table 1) Type specimens. Holotype male, inventory s lide no. 102/4 and paratype males (same slide) deposited in the collection of the helminthological museum of the Institute of Ecology and Evolution, Center of Parasitology, Russian Academy of Sciences, Moscow, Russia. Paratypes, inventory slides no. TC 2.10 repl. 1 and TC 2.29 repl.1) (5 males and 3 females) deposited in the nematode collection of the Institute of Ecology and Biological Resources, Vietnamese Academy of Science and Technology, Hanoi, Vietnam. Type habitat and locality. South China Sea, littoral zone off the coast of Vietnam, Tea Co. Latitude: 20º39.721’. Longitude: 106º41.662’–106º42.653’. Depth 1.5–5.0 m, sand, salinity 12.5–29.1 ‰. Collected in March 2010. Description. Male. Body elongated, cylindrical, tapering towards both extremities. Cuticle marked with transverse rows of fine punctations. Lateral differentiation, consisting of larger and more widely spaced irregular punctations, commences a short distance posterior to amphidial fovea and terminates at the base of the conical portion of the tail. Somatic setae small, sparse. Mouth surrounded by six rounded lips. Inner labial sensillae not visible. Outer labial sensillae in the shape of short setae 1.5 µm long. Four cephalic setae 3.5–4.5 µm long (29–32 % of labial region width). Cervical setae about 2.5 µm long. Stoma small, glass-shaped, its walls cuticularized. Amphidial fovea in shape of spiral, with 2.5–3.0 turns and occupying 65–70% of corresponding body diameter. Pharynx slender, muscular, swollen proximally, but not forming a bulb. Cardia small, muscular, surrounded by intestinal tissue. Renette 45– 53 x 25–29 µm in size, located on ventral side of body, at level of cardia; excretory pore posterior to nerve ring, at 120–132 µm from anterior body end. Gonads diorchic; testes opposite and outstretched. Anterior testis situated to left of intestine, posterior testis to right of intestine. Two spicules equal in ...