Halichoanolaimus ovalis Ditlevsen 1921

• Main Author: Leduc, Daniel
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Desmodorida; Choniolaimidae; Halichoanolaimus; Halichoanolaimus ovalis; Auckland Islands
• Online Access: https://doi.org/10.5281/zenodo.4328613; http://treatment.plazi.org/id/E71587B1C76B8B130D4DFA76CE91F833

Halichoanolaimus ovalis Ditlevsen, 1921 Table 1, Figs 1–3 Material examined NEW ZEALAND • 2 ♂♂, 1 ♀; Kaikōura Canyon, 42.5082° S, 173.6325° E; water depth 1061 m; voyage TAN1006 station 7, site K4; 3 May 2010; NIWA 139245. Type locality North Arm of Carnley Harbour, Auckland Islands. Description Males BODY. Cylindrical, tapering slightly towards anterior extremity. Cuticle with transverse rows of punctations; lateral differentiation consisting of larger, more widely spaced punctations. Two dorsosublateral rows of pore complexes extending from posterior to nerve ring to cloacal region, each pore complex ca 1.5 µm in diameter, becoming more closely spaced posteriorly. Up to two or three ventrosublateral pore complexes also present in pharyngeal region or slightly posterior to pharynx. Eight longitudinal rows of short, sparse somatic setae, 2–3 µm long. Cephalic region slightly rounded, with slight indentation immediately posterior to cephalic setae. Lip region not conspicuously differentiated, bearing six inner labial papillae. Six short outer labial papillae, 2 µm long, located at base of labial region and at same level as four cephalic papillae of same length. Amphideal fovea multispiral with 5.0 to 5.25 turns, situated ~0.4 cbd from anterior end. Buccal cavity (pharyngostome) large, 25–30 µm deep, divided into anterior (gymnostome) and posterior portions (stegostome). Anterior portion of buccal cavity cup-shaped, with three sets of six cuticularized rhabdions, 12–14 µm long, terminating in three sets of at least six pairs (one anterior and one posterior) of denticles; posterior portion of buccal cavity narrower, cylindrical, surrounded by three Y-shaped pairs of cuticularized rhabdions with swollen bases, 15–17 µm long. Pharynx cylindrical, muscular, without anterior or posterior bulb. Nerve ring at ca 45–50% of pharynx length from anterior. Secretory-excretory system present; renette cell up to 18 µm wide and 18 µm long, situated at level of cardia. Several nucleated pseudocoelomocytes also present around base ...