Sectonema caobangense sp. n. from Vietnam (Nematoda, Dorylaimida, Aporcelaimidae)

• Published in: Journal of nematology 2016-06, Vol.48 (2), p.95-103
• Main Authors: Álvarez-Ortega, Sergio, Nguyen, Thi Anh Duong, Abolafia, Joaquín, Bonkowski, Michael, Peña-Santiago, Reyes
• Format: Article
• Language: English
• Subjects: Bayesian inference; Contributed Paper; description; LSU ribosomal DNA; maximum likelihood; morphology; morphometrics; SEM; taxonomy
• ISSN: 0022-300X; 2640-396X; 2640-396X
• DOI: 10.21307/jofnem-2017-014

sp. n. from evergreen forest soil in Vietnam is described, including scanning electron micrograph (SEM) observations and D2-D3 LSU rDNA analysis. The new species is characterized by its 3.12 to 5.80 mm long body, lip region offset by deep constriction and 21 to 23 μm broad, mural tooth 13 to 14 μm long at its ventral side, 940 to 1,112 μm long neck, pharyngeal expansion occupying 61% to 69% of total neck length, uterus a long simple tube-like structure 292 to 363 μm long or 2.7 to 2.9 times the corresponding body diameter, well developed, = 48 to 56, short (36-51 μm, = 77-132, ’ = 0.5-0.8) and rounded tail, 87 to 99 μm long spicules, and four or five irregularly spaced ventromedian supplements bearing hiatus. sp. n. differs from the typical pattern of in the nature of the stomatal protrusible structure, bearing a mural tooth attached to the ventral side of the stoma. Molecular data obtained and the derived evolutionary trees support a close phylogenetic relationship with other species.