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Type: Article
Published: 2018-04-27
Page range: 150–160
Abstract views: 57
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Two new species of the genus Metaxonchium Coomans & Nair, 1975 (Nematoda, Dorylaimida, Belondiridae) from Vietnam

Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam. Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus ‘Las Lagunillas’ s/n, Edificio B3, 23071– Jaén, Spain. Department of Terrestrial Ecology, Zoological Institute, University of Cologne, Zülpicher Straße 47b, D–50674 Cologne, Germany.
Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus ‘Las Lagunillas’ s/n, Edificio B3, 23071– Jaén, Spain.
Nematoda description morphology new species taxonomy

Abstract

Two new species of the genus Metaxonchium are described from natural habitats of Vietnam. Metaxonchium bonkowskii sp. n. is characterized by its 1.69–2.23 mm long body, lip region offset by weak constriction and 9.5–10.5 µm broad, odontostyle 11–13 µm long, neck 673–868 µm long with the pharyngeal expansion occupying 66–77% of its length, anterior genital branch reduced to a uterine sac 75–135 µm long or 4–7% of body length, posterior uterus tetrapartite and including a Z–like differentiation, V = 51–55, and female tail short and rounded (37–51 µm, c = 66–97, c’ = 0.5–0.7). Metaxonchium silvaticum sp. n is characterized by its 1.28–1.43 mm long body, lip region offset by weak depression and 7.0 µm broad, odontostyle 8–9 µm long, neck 502–630 µm long with the pharyngeal expansion occupying 65–76% of its length, anterior genital branch reduced to a uterine sac 65–80 µm long or 4–6% of body length, posterior uterus tripartite, non-echinophor, V = 52–57, tail short and rounded (18–23 µm, c = 56–74, c’ = 0.6–0.8) with abundant blister–like or saccate bodies, spicules 41 µm long, and seven spaced ventromedian supplements.

 

References

  1. Abolafia, J. & Peña-Santiago, R. (2005) Nematodes of the order Rhabditida from Andalucía Oriental: Pseudacrobeles elongatus (de Man, 1880) comb. n. Nematology, 7, 917–926.
    https://doi.org/10.1163/156854105776186415

    Ahmad, W. & Jairajpuri, M.S. (1982) Studies on the genus Axonchium Cobb, 1920 from India. Nematologica, 28, 21–33.
    https://doi.org/10.1163/187529282X00484

    Ahmad, W. & Naz, T. (2010) Four new and one known species of Belondiroidea (Dorylaimida: Nematoda) from Japan. Journal of Natural History, 44, 1509–1530.
    https://doi.org/10.1080/00222931003690706

    Andrássy, I. (1970) Freilebende Nematodenaus Vietnam. Opuscula Zoologica Budapestinensis, 10, 5–31.

    Andrássy, I. (1996) Free-living nematodes in the Bükk mountains, Hungary. The fauna of the Bükk National Park, 1996, 33–63.

    Baermann, G. (1917) Eine einfache Methode zur Auffindung von Ankylostomum (Nematoden) Larven in Erdproben. Geneeskunding Tijdschrift voor Nederlandsch–Indië, 57, 131–137.

    Coomans, A. & Nair, P. (1975) The genus Axonchium (Nematoda: Belondiridae). VI. Atypical species, keys, subgenera and conclusions. Nematologica, 21, 296–332.
    https://doi.org/10.1163/187529275x00059

    Flegg, J.J.M. (1967) Extraction of Xiphinema and Longidorus species from soil by a modification of Cobb's decanting and sieving technique. Annals of Applied Biology, 60, 429–437.
    https://doi.org/10.1111/j.1744-7348.1967.tb04497.x

    Gambhir, R.K. & Dhanachand, C. (1991) Nematodes of fruit plants in Manipur–VI: Three new species of Dorylaimida. Uttar Pradesh Journal of Zoology, 11, 1–8.

    Hechler, H.C. (1969) Taxonomy and morphology of Axonchium (Nematoda: Belondiroidea), and a description of A. thornei n. sp. Journal of Nematology, 1, 321–348.

    Heyns, J. (1965) On the morphology and taxonomy of the Aporcelaimidae, a new family of dorylaimid nematodes. Entomology Memoirs Department of Agriculture Technical Services Republic of South Africa, 10, 1–51.

    Man, J.G. de (1876) Onderzoekingen over vrij in de aarde levende Nematoden. Tijdschrift Nederlandsche dierkundige Vereeniging, 2, 78–196.

    Peña-Santiago, R., Niknam, G., Álvarez-Ortega, S. & Jabbari, H. (2014) Metaxonchium persicum sp. n. from Iran (Nematoda, Dorylaimida, Belondiridae), with an updated taxonomy of the genus. Zootaxa, 3785 (4), 501–517.
    https://doi.org/10.11646/zootaxa.3785.4.1

    Siddiqi, M.R. (1964) Studies on Discolaimus spp. (Nematoda: Dorylaimidae) from India. Zeitschrift für Zoologische Systematik und Evolutionsforschung, 2, 174–184.
    https://doi.org/10.1111/j.1439-0469.1964.tb00720.x

    Thorne, G. (1939) A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zoologica, 8, 1–261.

    Varela-Benavides, I. & Peña-Santiago, R. (2017) Metaxonchium toroense n. sp. (Nematoda, Dorylaimida, Belondiridae) from Costa Rica, with the first molecular study of a representative of the genus. Journal of Helminthology.
    https://doi.org/10.1017/S0022149X17001134