Thalassomonhystera molloyensis Tchesunov et Miljutina, sp. n.

• Main Authors: Tchesunov, Alexei V., Miljutina, Maria A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2005
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Monhysterida; Monhysteridae; Thalassomonhystera; Thalassomonhystera molloyensis; Arctic; Arctic Ocean; Greenland; Svalbard
• Online Access: https://doi.org/10.5281/zenodo.5658421; http://treatment.plazi.org/id/E535B46CFFA7FFCFC707FE852919193E

Thalassomonhystera molloyensis Tchesunov et Miljutina sp. n. Table 1, Figs 5 & 6 Material . One holotype male, four paratype males and two 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, 16 August, 2000. Etymology . Species name molloyensis is referred to the geographic area where the species was collected. Description . Body small and slender, elongate spindle­shaped. Cuticle thin and smooth. Cephalic end narrowed. Labial region set off slightly with labial sensilla as tiny papillae. Outer labial and cephalic setae very short, nearly equal and jointed in one crown of ten setae 1.5–2.0 µm long (23–30% c.b.d. in males, 23–25% c.b.d. in females). Amphid circular, sometimes with slightly asymmetrical central spot, with distinct uninterrupted cuticular edging. In males, amphids are slightly larger than in females. Amphids situated well posterior to the stoma ending. There are two (males NN 1, 2, 3, 5, 6) or one (females NN 1, 4, 7) lateral or lateroventral cervical setae posterior to the amphid. There are usually one lateroventral seta just posterior to the nerve ring and a few sparse somatic setae along the body. Cervical and somatic setae 1–2 µm long. Buccal cavity cylindro­conoidal in shape and relatively voluminous. Esophastomal rhabdions slightly draw together to the posterior stoma ending or nearly parallel. Rhabdions thick but weakly sclerotised and weakly light­refracting, without an esophageal cuff. Esophagus with radial muscular striation, plainly widening to the posterior end. Cardia small, triangular, internal. Midgut with distinct peritrophic membrane and without visible intestinal cell borders. There may be a renette ampulla vaguely visible just posterior to the nerve ring and a renette cell body posterior to the cardia, to the right (males NN 2, 5, 6, females NN 4, 7, 8) ...