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Xiphinema iranicum n. sp. (Nematoda: Longidoridae) from north-western Iran

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Xiphinema iranicum n. sp. is described from soil samples collected about the rhizosphere of Rosa sp. growing in a natural mountainous region close to Maragheh city, north-western Iran. The new species belongs to group 6 of the polytomous key to species identification and is unique by having a medium body length (3.8-4.3 mm), odontostyle length of 141-162 μm, odontophore length of 90-98 μm, mid-body diam. of 69-88 μm, presence of spines in the uterus and a hemispherical to conoid tail with a rounded terminus or minute bulge. It resembles X. ingens, X. aceri, X. aequum, X. smoliki, X. illyricum, X. macedonicum and X. vuittenezi but differs from X. aceri and X. aequum by having different tail shape, longer odontophore, lower ratio a, higher ratio c and lower ratio c′. Compared to X. ingens and X. smoliki, it differs by having lower ratio a, lower ratio b, spines in uterus vs crystalline bodies plus pseudo Z-organ in X. ingens and spines plus pseudo Z-organ in X. smoliki and also by the presence of rare males, and, finally, it can be distinguished from X. vuittenezi by body and odontostyle length, characters of juveniles and molecular differences. The new species has similar polytomous identification codes to X. illyricum and X. macedonicum but can be differentiated from both by longer body, higher ratio c, higher V, longer odontostyle and odontophore and larger body diam. at mid-body and anus level. Ribosomal gene 18S rDNA and ITS1 of X. iranicum n. sp., X. aceri, X. montenegrinum and X. macedonicum, all obtained from north-western Iran in the same survey, were sequenced to investigate the phylogenetic relationships with other sequenced Xiphinema species.

Affiliations: 1: Plant Pathology, University of Tabriz, Tabriz, Iran; 2: Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran;, Email: g_niknam@tabrizu.ac.ir; 3: Department of Plant Pathology, University of Arkansas, Fayetteville, AR, USA; 4: Nematode Assay Section, North Carolina Department of Agriculture, Raleigh, NC, USA; 5: Department of Plant Pathology, Faculty of Agriculture, University of Shiraz, Shiraz, Iran

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