Amphimonhystrella bullacauda Tchesunov et Miljutina, sp. n.

• Main Authors: Tchesunov, Alexei V., Miljutina, Maria A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2005
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Monhysterida; Monhysteridae; Amphimonhystrella; Amphimonhystrella bullacauda; Arctic; Arctic Ocean; Greenland; Molloy; Molloy Deep; Svalbard
• Online Access: https://zenodo.org/record/5658413; https://doi.org/10.5281/zenodo.5658413

Amphimonhystrella bullacauda Tchesunov et Miljutina sp. n. Table 1, Figs 1, 2 Material. One holotype male, four paratype males and five paratype females. The slides are deposited in the nematode collection of the Shirshov Institute of Oceanology of Russian Academy of Sciences, Moscow. Type locality. Arctic Ocean, area between Greenland and Svalbard, 79 ° 8.2 'N & 02° 53.6 'E, depth 5569 m (Molloy Deep), silt, August 16, 2000. Etymology. The name bullacauda means “knob­terminated tail”. Description. Body slender, elongate spindle­shaped. Cuticle distinctly annulated with approximately ten annules per 10 µm. Cephalic end slightly narrowed, in shape of a truncated cone. Cephalic cuticle smooth from the apex to the stoma ending. There are very minute, obscure inner labial papillae in the labial region. Outer labial and cephalic setae united in almost one circle. Outer labial setae obscurely two­jointed and longer than smooth cephalic setae at about one third. Amphid relatively large, round or slightly longitudinally oval, with discontinuous fine but distinct edging, sometimes with central spot. There are no somatic setae visible along the body. Buccal cavity from elongateconical to nearly cylindroid, with thin but neat sclerotised walls, surrounded with an esophageal cuff at two thirds of its length. Esophagus slender but distinct, with weak radial muscular striation, slightly widened at the posterior end. Cardia cordate, vacuolised and surrounded with the intestinal tissue. There is no differentiated progaster or two­rowed arrangement of intestinal cells in the midgut. No renette cell visible. Single anterior female gonad situated to the left of the midgut. Female genital branch outstretched, poorly differentiated. The largest and ripest oocyte differs sharply from preceding oocytes by its greater size and dense coarse granulation. The ripest oocyte may reach 57–60 µm in length and 9–13 µm in width. Uterus plainly continues into a postvulvar sac narrowing to the blind posterior end situated ventrally of the ...