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

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Journal of Nematology

Society of Nematologists

Subject: Life Sciences

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ISSN: 0022-300X
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VOLUME 48 , ISSUE 2 (June 2016) > List of articles

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

SERGIO ALVAREZ-ORTEGA * / THI ANH DUONG NGUYEN / JOAQUI´N ABOLAFIA / MICHAEL BONKOWSKI / REYES PEN˜A-SANTIAGO

Keywords : Bayesian inference, description, LSU ribosomal DNA, maximum likelihood, morphology, morphometrics, SEM, taxonomy.

Citation Information : Journal of Nematology. Volume 48, Issue 2, Pages 95-103, DOI: https://doi.org/10.21307/jofnem-2017-014

License : (CC BY 4.0)

Received Date : 05-January-2016 / Published Online: 21-July-2017

ARTICLE

ABSTRACT

Sectonema caobangense 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 5.80mmlong body, lip region offset by deep constriction and 21 to 23 mm broad, mural tooth 13 to 14 mm long at its ventral side, 940 to 1,112 mm long neck, pharyngeal expansion occupying 61% to 69% of total neck length, uterus a long simple tube-like structure 292 to 363 mm long or 2.7 to 2.9 times the corresponding body diameter, pars refringens vaginae well developed, V = 48 to 56, short (36–51 mm, c = 77–132, c9 = 0.5–0.8) and rounded tail, 87 to 99 mm long spicules, and four or five irregularly spaced ventromedian supplements bearing hiatus. Sectonema caobangense sp. n. differs from the typical pattern of Sectonema 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 Sectonema species.

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