Three new species of the spiral nematode genus helicotylenchus steiner, 1945 (nematoda: hoplolaimidae) from Vietnam

Nguyen Ngoc Chau, Do Tuan Anh

Abstract


Investigations on entomopathogenic and plant parasitic nematodes in some natural forests in the Ngoc Linh mountain (Quang Nam province) and the Thuong Xuan forest (Thanh Hoa province) revealed three new species of plant parasitic nematodes belonging to the genus Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae). These new species were named Helicotylenchus castanus sp. n., Helicotylenchus madhucus sp. n. and Helicotylenchus digitus sp. n. with morphological characteristics described and illustrated. The new species Helicotylenchus castanus sp.n.  is characterized by the highly hemispherical shape of the lip region, extremely short and rounded tail without projection. The second new species Helicotylenchus madhucus sp. n. is characterized by high lip region with 4-5 annuli, hemispherical and not set off from body contour, stylet 31.3-35.9 (33.3 ± 1.3) µm long, tail with a short ventral projection and the presence of males in the population. The third new species, Helicotylenchus digitus sp.n. was recognized by broad rounded tail with strong annulated projection in the digital shape, and also the presence of males in population.

 


Keywords


New species, Helicotylenchus castanus sp. n., Helicotylenchus madhucus sp. n., Helicotylenchus digitus sp. n., Vietnam.

References


Anderson, R. V. 1979. A supplemental key to species of Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae) described since 1972 and a description of H. oscephalus n. sp. Can. J. zool. 57, 337-342.

Boag, B & Jairajpuri, M. S. 1985. Helicotylenchus scoticus n. sp. and a conspectus of the genus Helicotylenchus Steiner, 1945 (Tylenchida: Nematoda). Systematic.Parasitology. 7, 47-58.

Eroshenko, A. S. & Nguyen V. Thanh 1981. Ectoparasitic nematodes of pineapple Plantations in nothern and central provinces of Vietnam. In Free living and Plant parasitic nematodes fauna in oriental regions. USSR Acad. Sci., Vladivostok, 28-34 (in Russian).

Eroshenko, A. S., Nguyen N. Chau, Nguyen V. Thanh & Doan Canh 1985. Parasitic Phytonematodes of Nothern Vietnam. USSR Acad. Sci. Leningrad, 128pp (in Russian).

Firoza, K & Maqbool M.A. 1994. A diagnostic compendium of the genus Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae). Pak. J. Nematol. 12 (1), 11-50.

Firoza, K. & Maqbool, M.A. 1994. Descriptions of Helicotylenchus meloni and H. striatus n. sp. (Nematoda: Hoplolaimidae) from Pakistan. Pakistan Journal of Nematology 12, 109-116.

Firoza, K. & Maqbool, M.A. 1996. Description of Helicotylenchus lemoni n. sp. (Nematoda: Hoplolaimidae) with a key to species of Pakistan. Pakistan Journal of Nematology 14, 83-88.

Fortuner, R. 1987. A reappraisal of Tylenchina (Nemata). 8. The family Hoplolaimidae Filipjev, 1934. Revue Nematologie 10 (2), 219-232.

Manohar Lal & Khan, E. 1993. On the taxonomic status of species of Helicotylenchus Steiner, 1945. I. Having a digitale type tail terminus from India. Indian. J. Nematol. 23 (1), 110-117.

Nguyen N. Chau & Nguyen V. Thanh. 2000. Fauna of Vietnam. Vol. 4, Plant Parasitic Nematodes in Vietnam. Scientific and Technic Publising, Hanoi, pp 402.

Nguyen V. Thanh & Nguyen N. Chau (2001). Four spiral nematode species of Helicotylenchus from Vietnam. Advances in Natural Sciences 2(3), 77-88.

Shamsi M. A. 1973. Taxonimic notes on the genus Helicotylenchus Steiner, 1945 (Nematoda: Rotylenchinae) with a proposal for Zimmermannia n. sub-genus. Proc. Natn.Acad. Sci., India, Biol. Sci., 43, 80

Sher S. A. 1966. Revision of the Hoplolaiminae (Nematoda). VI. Helicotylenchus Steiner, 1945. Nematologica 12, 1-56.

Siddiqi M. R. 1972. On the genus Helicotylenchus Steiner, 1945 (Nematoda: Tylenchida) with descriptions of nine new species. Nematologica, 18, 74-91.

Subbotin, S.A., Volvas, N., Yeates, G.W., Hallmann, J., Kiewnich, S., Chizhov, V.N., Manzanilla Lopez, R.H., Inserra, R.N. & Castaillo, P. 2015. Morphological and molecular characterization of Helicotylenchus pseudorobustus (Steiner, 1914) Golden, 1956 and related species (Tylenchida: Hoplolaimidae) with a phylogeny of the genus. Nematology 17, 27-52

Tarjan A. C. (1964). Two new mucronate-tailed spiral nematodes (Helicotylenchus: Hoplolaaimidae), Netnatologica to (1964) 185-191.

Tarjan A. C. 1964. Two new mucronate-tailed spiral nematodes (Helicotylenchus: Hoplolaaimidae). Nematologica, 10, 185-191.

Uzma I., Nasira K., Firoza K. & Shahina F. (2015). Review of the genus Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae) with updated diagnostic compendium. Pakistan Journal of Nematology, 33(2): 115-160

Van Den Berg & Heyns, J. 1975. South African Hoplolaiminae. 4. The genus Helicotylenchus Srteiner. Phytophylactica, 7, 35-52.

Van Den Berg J. (1975). South African Hoplolaiminae. 4. The genus Helicotglenchus Srteiner, Phytophylactica (1975) 35-52.

Whitehead, A.G. 1958. Rotylenchoides brevis n. g., n. sp. (Rotylenchoidinae n. subfam: Tylenchida). Nematologica 3, 327-331.

Zarina, B. & Maqbool, M.A. 1991. Description of Helicotylenchus verecundus n. sp., and Tylenchorhynchus rosei n. sp., (Nematoda: Tylenchida) from Pakistan. Pakistan Journal of Nematology 9, 79-86.

Zeidan, A. B. & Geraert, E. 1990. Helicotylenchus from Sudan, with descriptions of two new species (Nematoda: Tylenchia). Nematol. Medit. 18. 33-45.




DOI: https://doi.org/10.15625/0866-7160/v41n2.13597

 

                 

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