Sabatieria parvamphis sp. n. (Figures 5–7, Tables 1, 3) Type material. Five males and two females were collected from station CC 1. Holotype: ♂ 1 on slide number Chukchi20100720 CC14206. Paratypes: ♂ 2 on slide number Chukchi20100720 CC14206, ♂ 3 on Chukchi20100720 CC14203, ♂ 4 on Chukchi20100720 CC14210, ♂ 5 on Chukchi20100720 CC14211, ♀ 1 on Chukchi20100720 CC14212, ♀ 2 on Chukchi20100720 CC12207. Type locality and habitat. All specimens were collected from the Chukchi Sea (52 m water depth). Station CC 1: 67.6722°N, 168.9562°W. Median grain diameter: 5.35 Md Φ, Sand: 33.34%, Silt: 58.02%, Clay: 8.63%. Etymology . The species name is derived from the latin parvus (=small) and amphis (=amphid), and refers to the small amphid in this species relative to other species of the ornata group. Measurements. Table 1. Description. Male. Body cylindrical, tapering slightly towards both extremities. Cuticle with transverse rows of dots, lateral differentiation consisting of larger, irregularly-spaced dots. Two dorso- and two ventro-lateral rows of short, sparse somatic setae. Three crowns of anterior sensilla: six inner labial papillae, six short but distinct outer labial setae and four short cephalic setae. Buccal cavity cup-shaped. Amphideal fovea spiral with 3.25 turns, located immediately posterior to cephalic setae. Pharynx gradually swelling towards posterior, not forming true bulb. Nerve ring 143–157 µm from anterior end of body, at 52–57% of the pharyngeal region length. Excretory pore 161–193 µm from anterior end of body, at 59–66% of the pharyngeal region length. Tail 197–209 µm long, conico-cylindrical with four rows of sparse short caudal setae and three short terminal setae. Reproductive system diorchic, with outstretched testes. Anterior testis to the left of intestine, posterior testis to the right of intestine. Spicules paired, equal, arcuate, equal to 1.2–1.4 cloacal body diameters in length. Gubernaculum with 28–32 µm long, with paired, curved apophyses. Thirteen to fifteen prominent tubular pre-cloacal ...