شناسایی تعدادی از نماتدهای انگل گیاهی فوق بالاخانواده‌ی Tylenchomorpha در فراریشه‌ی درختان میوه‌ی دانه‌دار در استان آذربایجان غربی

West Azarbaijan province is one of the most important centers for the production of pome fruit trees in Iran. Identification of species Tylenchomorpha, which are often plant damaging, is necessary for their better management and should be the attention by researchers. To identify these nematodes in the rhizosphere of pome fruit trees in West Azarbaijan province, during the years 2023 and 2024, 86 soil samples were collected from the orchards of the province. After transferring the samples to the Nematology Laboratory of Urmia University, the nematodes were extracted using the flotation-sieving and centrifugation method and transfereed to glycerin by De Grisse method. Morphological and morphometric studies were carried out using an optical microscope with a Dino digital camera. the D2-D3 region of the large ribosomal subunit (D2-D3 28S rDNA) was sequenced for molecular identification. The new sequences obtained were compared with those recorded in the GenBank. Bayesian method was used to reconstruct the phylogenetic tree. In this study, 20 species belonging to 13 genera were identified, which include the following species: Aphelenchoides richardsoni, Basiria flandriensis, Criconemoides informis, C. parvus, Criconema annuliferum, C. mutabile, Ditylenchus acutatus, Filenchus thornei, Helicotylenchus dihystera, H. californicus, H. digonicus, H. pseudorobustus, Mesocriconema antipolitanum, M. xenoplax, Pratylenchus coffeae, P. thornei, Neopsilenchus magnidens, Psilenchus iranicus, Tylenchorhynchus solani, Zygotylenchus guevarai. Basiria flandriensis and Ditylenchus acutatus species are briefly described due to the lack of information from Iran. In females of Basiria flandriensis body size is small, straight or ventrally curved, head with 5 annules, tail is narrow to sharp or delicate with a rounded tip. Stylet slender, ovary uniseriate, spermatheca axial, round to elongated with rounded sperms. Vagina and post vulval sac are short, vagina is about 40% and the post vulval sac is about 30-50% of the body width in vulval region. Female of Ditylenchus acutatus are relatively large nematodes, body is thin and straight after fixation, head is short with indistinct annules, cephalic framework is weak, six lateral lines, stylet is fine and short, terminal bulb pear-shaped and offset or partially overlap with intestine. Monodelphic, spermatheca with sperms, vulval lips are sometimes raised and vagina is thin-walled, post vulval sac is 3.5 times of body width at vulval region, tail is conical, with a sharp end. Also, in this research, 10 sequences of Basiria flandriensis, Helicotylenchus dihystera, H. californicus, H. digonicus, H. pseudorobustus, Pratylenchus coffeae, P. thornei, Psilenchus iranicus, Tylenchorhynchus solani, Zygotylenchus guevarai were obtained which can help to enrich the GenBank.