1Department of Plant Pathology, College of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2Department of Nematology, Plant Protection Research Institute, P. O. Box: 1454, Tehran 19395, Iran.
3Department of Plant Protection, College of Agriculture, University of Shiraz, Iran.
During a survey on the identification of plant-parasitic nematodes associated with walnut in Sanandej region (Kurdistan province, western Iran), a population of Paratylenchus labiosus was collected and identified morphologically. Description, illustrations and morphometrics of the species are given and comparisons are made between it and some related species. Paratylenchus labiosus comes more close to three species namely P. similis, P. tateae and P. italiensis in having certain diagnostic characters such as short stylet less than 18 µm long, concave-conoid head with prominent submedian lobes and tail ending to an acute to finely rounded terminus. However, P. labiosus differs from them in having a spermatheca full of sperm cells and presence of males. Different modes of reproduction (parthenogenesis or amphimixis) may be observed in different populations of some species in this genus, but somewhat unique reproduction behavior of P. labiosus could be considered as a diagnostic character for separation of it from the three closely related species.
Anderson, R. V. and Kimpinski J. 1977. Paratylenchus labiosus n. sp. (Nematoda: Paratylenchidae) from Canada. Canadian Journal of Zoology, 55: 1992-1996. Andràssy, I. 2007. Free-Living Nematodes of Hungary, II (Nematoda errantia). Hungarian Natural History Museum, Budapest, Hungary. 496 pp. Bahmani, J., Khozeini, F., Barooti, S., Rezaee, S. and Ghaderi R. 2013. Plant-parasitic nematodes associated with walnut in the Sanandej region of west Iran. Journal of Plant Protection Research, 53: 404-408. Brzeski, M. W. 1995. Paratylenchinae: morphology of some known species and descriptions of Gracilacus bilineata sp. n. and G. vera sp. n. (Nematoda: Tylenchulidae). Nematologica, 41: 535-565. Brzeski, M. W. 1998. Nematodes of Tylenchina in Poland and temperate Europe. Warszawa, Poland, Muzeum I Instytut Zoologii PAN, 397 pp. Brzeski, M. W. and Szczygiel, A. 1963. Studies on the nematodes of the genus Paratylenchus Micoletzky (Nematoda: Paratylenchinae) in Poland. Nematologica, 9: 613-625. Brzeski, M. W., Hanel, L., Nico, A. I., Castillo, P. 1999. Paratylenchinae: Redescription of Paratylenchus arculatus Luc & de Guiran, 1962, a new senior synonym of P. nainianus Edward & Misra, 1963 (Nematoda: Tylenchulidae). Nematology, 1: 375-380. Čermák, V., Renčo, M. 2010. The family Paratylenchidae Thorne, 1949 in the rhizosphere of grass and woody species in Europe: a review of the literature. Helminthologia, 47: 139-146. De Grisse, A. T. 1969. Redescription ou modification de quelques techniques utilisées dans Létude des nématodes phytoparasitaires. Melded Rijksfaculteit der landbouwetenschappen Gent, 34: 351-369. Esser, R. P. 1992. A diagnostic compendium to species included in Paratylenchinae Thorne, 1949 and Tylenchocriconematinae Raski & Siddiqi, 1975 (Nematoda: Criconematoidea). Nematologica, 38: 146-163. Ghaderi, R., Karegar, A. 2013. Some species of Paratylenchus (Nematoda: Tylenchulidae) from Iran. Iranian Journal of Plant Pathology, 49: 49-52 [137-156]. (In Persian with English summary). Gharakhani, A., Pourjam, E., Karegar, A. 2007. Some plant parasitic nematodes (Criconematoidea and Longidoridae) in Kerman province orchards. Iranian Journal of Plant Pathology, 43: 135-139 (372-397) [In Persian with English summary]. Khan, E., Prasad, S. K., Mathur, V. K. 1967. Two new species of the genus Paratylenchus Micoletzky, 1922 (Nematoda: Criconematidae) from India. Nematologica, 13: 79-84. Raski, D. J. 1975. Revision of the genus Paratylenchus Micoletzky, 1922 and descriptions of new species. Part I of three parts. Journal of Nematology, 7: 15-34. Raski, D. J. 1991. Tylenchulidae in agricultural soils. In: Nickle, W. R. (Ed.), Manual of Agricultural Nematology. New York, NY., USA, Marcel Dekker Inc., pp. 761-794. Siddiqi, M. R. 2000. Tylenchida Parasites of Plants and Insects, 2nd edition. Wallingford, UK, CABI Publishing, 833 pp. Tarjan, A. C. 1960. A review of the genus Paratylenchus Micoletzky, 1922 (Paratylenchidae: Nematoda) with a description of two new species. Annals of New York Academy Sciences, 84: 329-390. Wu, Y. L., Townshend J. L. 1973. Paratylenchus tateae n. sp. (Paratylenchinae, Nematoda). Canadian Journal of Zoology, 51: 109-111.