Amphimonhystera pallida Tchesunov et Mokievsky, sp. n.

• Main Authors: Tchesunov, Alexei V., Mokievsky, Vadim O.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2005
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Monhysterida; Monhysteridae; Amphimonhystera; Amphimonhystera pallida; Arctic Ocean; Greenland; Svalbard
• Online Access: https://doi.org/10.5281/zenodo.6265180; http://treatment.plazi.org/id/03DED3244807FFB2FE9DF9D1FC12FB85

Amphimonhystera pallida Tchesunov et Mokievsky sp. n. (Figure 7) Type material: Holotype male 1 (ref # M­1/1), paratype male 2 (ref # M­1/2) and paratype female 1 (ref # M­1/8) mounted in glycerin on glass slides. Type specimens are deposited in the collection of the P. P. Shirshov Institute for Oceanology, 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 : The species name reflects the pale colouration of the species in comparison with some other brownish Amphimonhystera species. Morphometric data: Table 6. Description: Small nematodes with slender, near fusiform to cylindrical body. Cuticle thin, with fine transverse annulation. Subcuticular yellow­brownish granulation weakly developed (mainly in pre­amphidial and amphidial regions) in males or nearly absent in female. Pre­amphidial region more or less narrowed. Labial region slightly set off. Inner labial sensilla as poorly visible tiny papillae. Outer labial and cephalic sensilla united in one circle of ten setae of moderate length. Amphidial fovea large, longitudinally oval, with distinct unbroken cuticular edging and without a visible central spot. Somatic sensilla short, scarcely distributed laterally along the body; nearly absent in midgut region. Buccal cavity small; cheilostoma hemispherical; esophastoma narrow, funnel shaped, with sclerotised walls. Esophagus slender, weakly muscular, gradually widening to the posterior end. Cardia small, triangular, internal. Midgut with distinct internal lumen and peritrophic membrane. At a short distance posterior to the cardia, the midgut shifted dorsally by a cell body which may be a pseudocoelomocyte or cell body of a rudimental renette cell. Anterior portion of the female branch situated left of the intestine, posterior portion right of the intestine. Uterus with two ripe eggs. Vulva as a small transversal slit. No vulval glands discernible. Anterior strait testis ...