Sabatieria bitumen (Figs 1–3, Table 1) Material examined. Five males, four females (NIWA 865986), collected 6 April 2007, southwest Chatham Rise (1240 m water depth), 44.4864 °S, 177.1407 °E. Characteristics of surface sediment layer (0–5 mm): mostly silt/ clay (82.9 %), with very fine sand (9.4 %), and fine sand (7.7 %); calcium carbonate content: 38.4 %; total organic matter content: 1.9 %; chloroplastic pigment concentration: 3501 ng /gDW sediment. Description. Male Body cylindrical, tapering slightly towards anterior extremity. Cuticle with transverse rows of dots, lateral differentiation consisting of larger, irregularly-spaced dots. Two dorso- and two ventrolateral rows of short, sparse somatic setae. Head set-off by constriction immediately posterior to cephalic setae. Six inner labial papillae, six outer labial papillae, and four short cephalic setae. Anterior portion of buccal cavity cup-shaped, lightly cuticularised at base, posterior portion narrow. Fovea amphidialis spiral, 3.0– 3.5 turns, located immediately posterior to cephalic setae. Marginal tubes arising from base of buccal cavity and extending to posterior end of pharynx. Pharynx gradually swelling towards posterior, not forming true bulb, cardia short, 5–10 µm long. Nerve ring near middle of pharynx. Secretory-excretory system present, cellular body of ventral gland near level of cardia, pore situated 0.5 –1.0 cbd posterior to nerve ring. Intestine wall with numerous small, colourless granules, with differentiation of rounded cells containing more densely packed granules in anterior portion (Figs 2 B and 3 C), and clusters of clear circular inclusions in posterior portion of intestine (Fig. 2 D). Reproductive system diorchic with outstretched testes. Anterior testis to left of intestine and posterior testis to right of intestine. Mature sperm cells elongated, length 14–17 m and diameter 7– 9 m. Spicules paired, equal, arcuate, 1.4–1.6 abd long, without capitulum, distal hook and with central cuticularised projection (lamella) extending from ...