Cervonema indet

Barnes, Natalie, Kim, Hyeong Geun & Lee, Wonchoel, 2012, New species of free-living marine Sabatieriinae (Nematoda: Monhysterida: Comesomatidae) from around South Korea *, Zootaxa 3368 (1), pp. 263-290 : 284-286

Cervonema indet . A

( Fig. 7 )

Sampling Locality. About 6 km off-shore, north-east from Sehwa-ri, Jeju Island (33.5700º N, 126.8900º E), in sandy sediment and 55 m water depth .

Material. Two females, NIBRIV000024586-9 on separate slides, collected by Kwang-Soo Kim in May 2011 from Research Vessel Tam-Gu 8.

Measurements. See Tables 7 and 8 for detailed measurements and calculations.

6 259 222 693 236 1236 1463

female1

12 46 52 36

3 248 193 640 211 1211 1445

female2

11 42 44 30

Description. Female ( Fig. 7 ). Habitus tubular, tapering from cloaca to conico-cylindrical tail posteriorly, anterior narrowing more gently from nerve ring to lips. Cuticle with faint, relatively fine striation throughout body, cylindrical section of tail appears smooth.

Six small lips indistinct, labial papillae minute. Six anterior cephalic setae (0.5 hd long) located about 0. 4 hd from anterior extremity, 4 posterior cephalic seta. (0.5 hd long) in distinctly separate crown. Amphid, 1.5 hd from anterior, multi-spiralled with 5 turns (diameter 0.6 cbd). Cervical setae scarce, 4 µm long. Somatic setae scarce, 5 µm long. Setae scattered around lateral field in cloacal region, last setae observed 2.7 abd (43 % of tail length) from the cloaca in cylindrical portion of tail.

Anterior section of buccal cavity minute (3 µm deep), posterior section not observed. Oesophageal musculature surrounds buccal cavity, sclerotization not observed. Posterior elongate oesophageal bulb (31 % of oesophagus length). Cardia short (7 µm long). Nerve-ring at 42 % of oesophageal length from anterior, ventral pore posterior to nerve ring (52 % of oesophageal length). Ventral gland small, round, behind cardia, distance from pore to base of gland 135 µm (52 % of oesophageal length).

Vulva at 47 % of body length, as lateral slit without epiptygmata. Vagina short and straight without sclerotizations. Didelphic, outstretched ovaries, anterior 222 µm, posterior 236 µm long. Supplements absent. Tail conico-cylindrical 6.3 abd long, with cylindrical portion 69 % of total, three terminal setae (4 µm long).

Affinities. Cervonema sp. A is superficially similar to C. deltensis Hope and Zhang 1995 described from the Bohai Sea and and C. pseudodeltensis sp. nov. However, comparing females, it differs from C. deltensis with regard to the relative length of the oesophagus (b = 5.7 – 5.8 vs 6.3 – 6.7) and tail length (c = 6.2 – 6.5 vs 7.3). It also differs from C. pseudodeltensis with regard to relative length of the oesophagus (b = 5.7 – 5.8 vs 7.0 – 7.9), and body length (1445 – 1463 µm vs 1828 – 2104 µm), and the simpler and short anterior cephalic setae (length of R2 and R3 equal in Cervonema sp. A ).

Figures

FIGURE 7. Cervonema sp. A., female: A, head; B, oesophagus; C, vulva; D, tail; E, gonads; F, habitus. Scale bars: 10 µm (A–C), 20 µm (D); 40 µm (E), and 200 µm (F).