First record of the genus Discotylenchus Siddiqi, 1980 (Nematoda: Tylenchidae) from Iran, with description of one new and data on two known species Author Ghaemi, Razieh Author Pourjam, Ebrahim Author Atighi, Mohammad Reza Author Pedram, Majid Author Karssen, Gerrit text Zootaxa 2012 3493 72 82 journal article 10.5281/zenodo.282451 566fdb17-a69c-4b68-b145-e9af7155737f 1175-5326 282451 C30A434D-DAA8-4784-BD94-D425AFE56D9E Discotylenchus brevicaudatus Brzeski, 1985 ( Figs. 3 , 5 ) Measurements. See Table 2. This population was recovered from the rhizosphere of plum ( Prunus domestica L.) trees in a garden, close to city of Bojnourd, Northern Khorasan province, north-eastern Iran during May 2009 . Morphological and morphometric characters of the Iranian population of D. brevicaudatus agree completely with those in original description (see Table 2), although there is a wider range for some morphometric data compared to the type population i.e. the Iranian population has a longer body (0.42–0.46 vs 0.32–0.39 mm ), slightly shorter stylet (6–7 vs 7–8 µm), longer pharynx (116–132 vs 69–73 μm), longer tail (57–77 vs 35–47 μm), smaller c (5.9–7.8 vs 8.1–9.8), higher c' (6.3–9.6 vs 4.5–6.0) and slightly smaller V (68.2–71.6 vs 71–73). From a morphological perspective, the basal bulb in Iranian population is long and bottle shaped in dimension of 40–55×7.5–8.5 µm, whereas in the original population it is pyriform. The male of this species is described for the first time and is similar to females in general morphology except for character states associated with sexual differences. Testis is single, anteriorly outstretched and 91±6 (85–99) μm long. Spicules slender, ventrally curved. Gubernaculum simple, bursa smooth, adcloacal and 17±2 (15–19) µm long. Remark. As in the original description ( Brzeski, 1985 ), the females of the Iranian population had sperm in genital tract and the males were also recovered, demonstrating the amphimictic nature of reproduction in this species. TABLE 2. Morphometrics of Discotylenchus brevicaudatus . All measurements are in μm, and in the form: mean ± s.d. (range). Iranian population Brzeski, 1985